AwkChannelWiki: Search for: "string"

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Adler32Checksum
As documented in the [[http://en.wikipedia.org/wiki/Adler-32 | Adler-32 Wikipedia article]]. {{{ awk . . . entire # algorithm: since all awk arrays have string keys, every # index into an array incurs the . . . constant overhead of the # string hash function. It's a good thing that our keys . . . # here are strings; if they were numbers, we would also # have . . . to convert those numbers to strings before using # them as keys. Yikes! Mawk mitigates . . .
4K - last updated 2008-12-31 12:05 UTC by pgas

assign
== The assignment operator == In [[awk]], as with most other programming languages, the *equals sign* . . . of [[variable]]s: {{{ fruit = "apple" # assign a string to a variable count = 5 # assign a numeric value . . .
1K - last updated 2010-11-28 18:17 UTC by markhobley

awk1page
an awk program is a series of //pattern { actions }// statements;\\ ie if the input line matchs pattern . . . } }}} would only print lines that contained the string ''abc''. Lines are split into fields separated . . .
2K - last updated 2012-03-18 22:22 UTC by g0pher

AwkDc
This is an awk implementation of the [http://www.gnu.org/software/bc/manual/dc-1.05/html_mono/dc.html|dc] . . . " op >> "/dev/stderr" return } function putstring(stk, str) { _dc_put(stk, "[" str "]") } # }}} . . . message here # FIXME: extend '+' to operate on strings? # FIXME: the above comment is stupid, and . . . # L # -- parameters # i # o # k # I # O # K # -- strings # a # x # >r # !>r # <r # !<r # . . . 4 ops missing # parameters ---- 6 ops missing # strings ------- 10 ops missing } else if (op == "q") . . .
12K - last updated 2008-07-17 14:47 UTC by gnomon

AwkFeatureComparison
This page lists which awk implementations support which features. Additions and corrections are very . . . |=FS can match the empty string|unknown?|no|yes|no|no|no|unknown|no|no|yes| . . . '' '{print NF}' # 3}}}| |=FS can match the empty string|{{{echo aaba|awk -F 'b*' '{print NF}' # >2}}}| . . .
4K - last updated 2015-04-27 13:23 UTC by pgas

AwkGuide
** Work in Progress ** {{{ import from Mark Hobley's wiki }}} <toc> ---- == Overview * [[Overview]] . . . [[doublequotes]] * [[empty statement]] * [[empty string]] * [[END]] * [[enumeration]] * [[environment|ENVIRON]] . . . * [[special variable]]s * [[statement]]s * [[string]]s * [[string manipulation]] * [[string manipulation . . .
4K - last updated 2011-08-14 15:57 UTC by markhobley

AwkTips
<toc> ---- == Be idiomatic! In this paragraph, we give some hints on how to write more idiomatic . . . Let's say we want to check whether a given string is a valid IPv4 address (for simplicity, we . . . The fact is that, due to the way awk's number to string conversion works, some strings may "look like" . . . The correct thing to do here is to perform a string comparison against a regular expression: {{{ . . . Basically, there are only two data types in awk: strings and numbers. Internally, awk does not assign . . .
31K - last updated 2009-03-24 16:54 UTC by waldner

Backref2
The usual (and correct) answer for backreferences in awk (for example, the answer you can get on #awk . . . awk. But if you are using backreferences during string substitution, to insert text previously captured . . . awk) require that you have only one matching substring to extract per line. * Third answer: see [[GeneralizedTextReplacement]] . . .
2K - last updated 2009-03-26 20:24 UTC by waldner

Backreferences
The usual (and correct) answer for backreferences in awk (for example, the answer you can get on #awk . . . awk. But if you are using backreferences during string substitution, to insert text previously captured . . . unlike sub() and gsub(), returns the modified string without touching the original. Also note that . . . to replace only that specific match, or the string "g" (as in the example), to indicate replacement . . . awk) require that you have only one matching substring to extract per line. For the same purpose, with . . .
3K - last updated 2010-12-30 06:53 UTC by ppp089210039107.dsl.hol.gr

backslash
In [[awk]], the backslash symbol can be used: * as a line [[continuation]] character * for suppression . . . * insert [[literal character]]s into a string . . .
1K - last updated 2011-05-09 22:34 UTC by markhobley

BackslashInRegexp
Because {{{"\\$"}}} is a string and {{{/\\$/}}} is not; in strings, some of the escape characters get . . . {{{\"}}} to escape a double-quote within the string). {{{ /\\$/ => regular expression: literal . . . backslash at end-of-expression "\\$" => string: \$ => regular expression: literal dollar . . . }}} To get behavior like the first case in a string, use {{{"\\\\$"}}} . There are other, less obvious . . .
2K - last updated 2008-11-26 12:27 UTC by pgas

case conversion
The [[awk]] extraction and reporting language provides the toupper and tolower functions for converting . . . strings to uppercase or to lowercase: == tolower == . . . === Usage === tolower(STRING) === Description === The tolower function returns . . . a lowercase version of the STRING argument. This function converts all letters . . . to lowercase in the returned string. Only the returned string is converted, the . . .
2K - last updated 2011-06-25 05:10 UTC by pgas

case sensitivity
== Indentifier names == The [[awk]] interpreter is lettercase sensitive. This means that [[variable name]]s . . . provides a variety of functions for converting [[string]]s to uppercase or to lowercase: * [[tolower]] . . . - Converts a string to lower case * [[toupper]] - Converts a string . . .
1K - last updated 2011-06-25 05:14 UTC by pgas

CAWKLib
=CAWKLib CAWKlib is a library of functions for for awk intended to be used with preprocessors/wrappers . . . -- return random index from an array strings.awk: *str_capitalize() -- returns a string . . . is capitalized. *str_insert() -- returns string 's1' with string 's2' inserted at index 'i' . . . *str_repeat() -- repeats a string x number of times (thanks again Ben) *str_repeat_to() . . . -- repeat a string up to a certain length *str_reverse() -- revers . . .
5K - last updated 2015-01-29 10:14 UTC by 108-243-116-77.lightspeed.cicril.sbcglobal.net

comp.lang.awk FAQ
This material of this faq originates from the comp.lang.awk FAQ that you can find there: * http://www.faqs.org/faqs/computer-lang/awk/faq/ . . . Edit this answer]] ---- == How can I split a string into characters? <include "SplitIntoChars"> . . . ---- == How do I have dynamic-width printf strings, like C? <include "PrintfDynamicWidth"> . . .
8K - last updated 2009-03-04 12:42 UTC by pgas

comp.lang.awk FAQJapanese
This material of this faq originates from the comp.lang.awk FAQ that you can find there: * http://www.faqs.org/faqs/computer-lang/awk/faq/ . . . Edit this answer]] ---- == How can I split a string into characters? <include "SplitIntoCharsJapanese"> . . . ---- == How do I have dynamic-width printf strings, like C? <include "PrintfDynamicWidthJapanese"> . . .
4K - last updated 2008-11-24 09:01 UTC by pgas

comparative operator
The comparative operators are used to determine equality or inequality or otherwise make comparisons . . . of numeric or string values, and produce a boolean truth based on . . . | ?: | [[ternary]] operator == String comparison In awk, the comparative operators . . . can be used to compare strings for lexical equivalence or ordering. The string . . . code snippet demonstrates how to compare strings for equivalence and lexical ordering: {{{ BEGIN . . .
3K - last updated 2013-02-24 17:38 UTC by markhobley

concatenation
== The awk programming language does not have an explicit concatenation operator == The awk programming . . . concatenation operator. Concatenation of [[string]]s in awk is achieved by placing strings next . . . } }}} === Numeric values will be concatenated as strings === Note that concatenation of [[numeric]] . . .
1K - last updated 2011-06-25 05:13 UTC by pgas

ConcatenationPrecedence
You'd expect `6 -22', but you get `6-22'. It's because the `" " -22' is grouped first, as a substraction . . . then it is concatenated with `6', giving the string `6-22'. Gentle application of parentheses will . . .
1K - last updated 2008-12-15 12:37 UTC by pgas

continuation
Line continuation enables long lines of code to split across several lines for the purpose of making . . . placed in the middle of a [[keyword]], [[literal string]] or [[regular expression]]: {{{ # Do not split . . .
1K - last updated 2011-05-09 22:48 UTC by markhobley

CookBook
<toc> ---- Just started, the aim of this page is to collect small pieces of code that illustrate . . . ---- == How to find the last matching substring on a line for a given regular expression <include . . .
1K - last updated 2009-04-14 09:03 UTC by 216.162.199.202

delimiter
== _Literal strings are delimited using doublequotes_ In [[awk]], literal strings are delimited using . . .
1K - last updated 2010-10-21 20:58 UTC by markhobley

division
== Quotient Division == The [[slash]] symbol can be used as the division [[operator]] to produce the . . . zero is encountered. Instead mawk returns an inf string without producing a warning or error: # This . . .
2K - last updated 2011-03-20 07:07 UTC by markhobley

dollar
== Prefixing field numbers == The dollar symbol can be used to prefix [[field]] numbers: == Regular expression . . . expression [[anchor]] to match the end of a [[string]]: . . .
1K - last updated 2010-11-28 10:46 UTC by markhobley

dollarint
A [[dollar]] sign and followed by an [[integer]] are used to refer to [[field]]s within the current [[record]]: . . . a non existing [[field]] will produce an [[empty string]]. === Field numbers must be positive === It . . .
3K - last updated 2011-06-25 05:28 UTC by pgas

EnvVarGeneral
**Answer 1:** On Unix, use "alternate quoting", e.g. {{{ awk -F: '$1 ~ /'"$USER"'/ {print $5}' /etc/passwd . . . }' awk: BEGIN{ print "hello awk: ^ unterminated string }}} That however works using -v: {{{ $ var="hello . . .
3K - last updated 2011-07-05 09:31 UTC by pgas

EnvVarGeneralJapanese
== 環境変数を使う **解答 1:** Unix では「もうひとつのクォート」を使います。例えば、以下のようなものです。 {{{ awk -F: '$1 ~ /'"$USER"'/ {print $5}' . . . }' awk: BEGIN{ print "hello awk: ^ unterminated string }}} そこで -v を使うと動作させることができます。 {{{ $ var="hello . . .
2K - last updated 2008-11-23 14:37 UTC by hi saito

escape sequence
Some characters cannot be included in [[literal string]]s, because they are [[nonprintable]] or [[control . . . characters that affect [[delimit]]ation of the strings, such as [[quotation mark]]s. These characters . . . can be used to insert literal characters into a string An *escape sequence* consists of a [[backslash]] . . . an escape sequence in the middle of a [[literal string]]: print "first line \n second line" # The \n . . . represents a newline character in a string The above produces the following output: first . . .
3K - last updated 2008-12-30 13:07 UTC by Mark Hobley

Features of awk
The [[awk]] utility: * treats lines of a text as database records, which can be divided into fields. . . . extract data. * makes use of mathematical and string [[operator]]s. * uses common programming constructs, . . .
1K - last updated 2011-05-27 15:33 UTC by markhobley

field reference
== The field reference operator == The [[dollar]] symbol acts as a unary *field reference operator* and . . . a non existent field will produce an empty string === Attempting to reference a non existing field . . . produces an [[empty]] string. === Referencing field zero gives the entire . . .
2K - last updated 2011-06-28 09:12 UTC by markhobley

FieldReference
$ is the "field reference" operator in AWK. It references the field in the current input record given . . . but only if it something other than the empty # string: if ($i != "") print $i; }}} . . .
1K - last updated 2009-01-03 01:51 UTC by fcr

FindAllIndices
Sometimes it is useful to find the index of every occurrence of a given character in a string. Let's . . . example, that you're trying to find doublequoted strings which may contain backslash-escaped quote characters. . . . index indicates the beginning of a doublequoted string and each even index, the end of one. {{{ awk . . .
2K - last updated 2011-07-05 10:53 UTC by pgas

FindAllMatches
This bit of code will match all non-overlapping instances of a given pattern in a string and will store . . . also store the position of the matches in the string in the start[] array; if you want to do so, . . . # optional: save position of match in the string # eaten+=(RSTART+RLENGTH-1) str = substr(str, . . .
2K - last updated 2009-03-24 09:46 UTC by waldner

FIXES
[[FIXES]]        revised:   . . . Added \x to regular expressions (already in strings).\\ awk -f - reads the program from stdin.\\ . . .
6K - last updated 2014-01-15 23:17 UTC by g0ph3r

ForceNumeric
These are the canonical, work-in-all-versions snippets. There are many others, most longer, some shorter . . . }}} To compare two variables as non-numeric strings ONLY, use {{{ awk if ("" var1 == "" var2) }}} . . .
1K - last updated 2008-11-26 12:43 UTC by pgas

FS
= Field Separator = The [[special variable]] FS is a field separator that is used to determine how [[awk]] . . . }}} === Special behaviour === ==== The empty string value ==== The behaviour of the awk interpreter . . . when the field separator is set to an [[empty string]] is undefined. Some implementation of awk will . . .
5K - last updated 2013-02-19 21:45 UTC by markhobley

gawkism
Gawkisms are non portable syntax components that do not work with some awk implementations. The use of . . . function * [[TEXTDOMAIN]] * underscore string prefix (for translation) * [[xor]] (bitwise . . .
2K - last updated 2011-05-19 22:29 UTC by markhobley

GeneralizedTextReplacement
Some times people need to recode in awk something they were previously doing with sed or another tool. . . . replaced). The idea is to find all matching substrings in the original text (the lhs of the s/pattern/replacement/ . . . rebuild the original line with the matched strings replaced by the replacement strings. {{{ awk . . . # Builds a new string starting from orgstr with all the occurrences . . . of # the strings in mtch[] replaced by the corresponding strings . . .
6K - last updated 2009-03-26 20:38 UTC by waldner

GeoLocation
{{{ awk #!/bin/gawk -f function getcoord(string, a) { split(string, a, ":") gsub(/\"/, "", a[2]) return . . .
1K - last updated 2011-11-14 16:35 UTC by pgas

Hello World in awk
This example program outputs the words "hello world" to the terminal: {{{ awk # Hello World BEGIN { print . . . function calls the [[print]] statement with a [[string]] of [[character]]s, which are output to the . . .
2K - last updated 2010-11-11 19:16 UTC by markhobley

HomePage
This wiki is maintained by regulars from the **#awk** channel on **[[https://libera.chat/|irc.libera.chat]]** . . . * FindAllIndices of a particular character in a string * FindAllMatches of a particular pattern in . . . a string * RepeatAString n times * FormatFileSizes in . . . compute a score for the difference of two text strings * PrimeNumberSieve implemented in two slightly . . . context lines around a match * [[Shellquote]] strings for use in shell commands * [[Transpose]] a . . .
5K - last updated 2023-06-26 04:15 UTC by HappMacDonald

HomePageJapanese
Here is the Japanese page for [[HomePage]]. 英語のページは[[HomePage|こちら]]です。この wiki は **[[http://www.freenode.net|irc.freenode.net]]** . . . * [[RepeatAString|文字列を n 回繰り返す]] * [[FormatFileSizes|可読なフォーマットのファイルサイズ]] . . .
5K - last updated 2008-10-19 07:34 UTC by hi saito

index
== Usage == === index [ STRING, SUBSTRING ] === The index [[function]] is used to locate the first occurrence . . . of a [[substring]] within a [[string]]. If the [[substring]] . . . will only occur if the lettercase of the [[string]] matches that of the [[substring]]. . . .
1K - last updated 2011-06-09 20:36 UTC by markhobley

Inicio
Este wiki es mantenido por los usuarios del cenal **#awk** en **[[http://www.freenode.net|irc.freenode.net]]**. . . . * FindAllIndices of a particular character in a string * FindAllMatches of a particular pattern in . . . a string * RepeatAString n times * FormatFileSizes in . . . compute a score for the difference of two text strings * PrimeNumberSieve implemented in two slightly . . .
7K - last updated 2009-02-12 23:31 UTC by fcr

length
== Usage == === length ([ STRING ]) === The **length** function returns the number of characters within . . . a provided string [[argument]]: {{{ awk BEGIN { print length("Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch") . . . enclosures can be omitted from the string [[argument]]. However, this legacy form of syntax . . .
1K - last updated 2011-06-25 05:11 UTC by pgas

LevenshteinEditDistance
The [http://en.wikipedia.org/wiki/Levenshtein_distance|Levenshtein edit distance] calculation is useful . . . for comparing text strings for similarity, such as would be done with . . . The [http://www.csse.monash.edu.au/~lloyd/tildeStrings/Alignment/92.IPL.html|lazy-evaluation method], . . . gains would be worth; still, for short strings, the lazy code could perhaps be modeled via . . . recursion by executing from the end of the string rather than the beginning. If experiments are . . .
6K - last updated 2010-04-16 10:19 UTC by pgas

literal characters
== Special characters cannot be directly included in a literal string == Special characters, such as . . . cannot be included directly in a [[string]] value. This is because these [[character]]s . . . [[special character]]s to represented in a [[string]] by using a [[representation code]] that begins . . . a backslash to insert literal characters into a string === The following example shows how a backslash . . . is used to insert literal characters into a string. Note that the \n digraph is used to represent . . .
2K - last updated 2010-11-28 19:14 UTC by markhobley

logical operator
In [[awk]], *logical operators* are used to perform [[boolean]] operations, and a return a value of [true] . . . and 1 for [[true]]. In [[awk]], the null [[string]]s "" are treated as [[false]] expressions, . . . a non null string is true: {{{ awk print (0 && 0) # 0 . . . 7) # 1 (true) print ("" && "") # 0 (null strings are treated as false) print ("apples" && . . . (2 || 7) # 1 (true) print ("" || "") # 0 (null strings are treated as false) print ("apples" || "pears") . . .
3K - last updated 2009-01-02 11:13 UTC by pgas

LshalOutputParser
=== Problem Specification 10:50 <Thanatermesis> i want to obtain the model of the disk, for example, . . . match($2, /$[^$]+\)$/) # find parenthesized strings that are last on the line if (RLENGTH > . . .
3K - last updated 2008-06-27 16:22 UTC by gnomon

MostrarApostrofos-español
Esta pregunta es tan frecuente que merece su propia respuesta. Y aunque pareciera que esto es una limitación . . . de apóstrofos, pero podría dar problemas con los strings literales de awk y con el operador para referenciar . . . in its own variable and then using explicit string concatenation: {{{ awk 'BEGIN{q="\047";print . . .
4K - last updated 2009-01-15 20:03 UTC by fcr

Newline
"print" prints a newline by default. If you don't want a newline, you can use printf instead it is straightforward, . . . just remember to use a format string and avoid putting data in it. {{{ awk printf . . .
1K - last updated 2011-07-05 10:53 UTC by pgas

nudge operator
The *nudge operators* can be used to [[increment]] or [[decrement]] the value of their [[operand]]s, . . . = --number # result is -0.6 }}} == Nudging strings === Numerical strings will evaluated as traditional . . . numerical values In awk, numerical strings will evaluated as normal numeric values within . . . --number # result is -1.4 }}} === Non numerical strings will be nudged as a zero Non numerical strings . . . will return a value relative to that: {{{ string = "abc" result = ++string # 1 string = "abc" . . .
3K - last updated 2011-03-20 13:18 UTC by markhobley

numeric strings
Numeric strings obtained from the input source, will be treated as numeric values, when compared with . . . other strings containing numeric values. Strings valued defined . . . using doublequote enclosures will be treated as strings of characters and compared lexically. The behaviour . . . value has been defined explicitly as a numeric string by using doublequote enclosures may also vary . . .
5K - last updated 2013-02-24 17:40 UTC by markhobley

oawk
oawk is "old awk", it is the default /usr/bin/awk on Solaris and should not be used. You can also find . . . print}' awk: can't set $0 }}} ==== Strings can unexpectedly become numeric variables: . . .
5K - last updated 2012-01-24 08:29 UTC by pgas

operator
The [[awk]] programming language provides a series of *operators* that allow [[value]]s and [[variable]]s . . . [[integer]] and [[floating point]] numbers. == string operators * [[string operator]]s == logical . . .
3K - last updated 2011-05-24 22:19 UTC by markhobley

Overview
= Overview of awk = == The primarily purpose of awk is to processing textual data to produce formatted . . . [[branch]]es, and enables [[arithmetic]] and [[string]] operations to be performed. == Where is awk . . .
4K - last updated 2011-05-23 23:09 UTC by markhobley

Overview of regular expressions
== What is a regular expression? == A regular expression is a method of representing a string matching . . . pattern. Regular expressions enable strings that match a particular pattern within textual . . .
2K - last updated 2011-05-17 20:32 UTC by markhobley

PassingAnArray
* You can use split to create an array from a string: {{{ sh awk -v list='foo,bar,baz' ' BEGIN { n=split(list, . . .
1K - last updated 2009-04-13 22:51 UTC by goedel

PassingAShellVariable
The common solution is to use the -v option to define an awk variable giving it the value of the shell . . . as a variable take care that the pattern is a string, so the \ are interpreted twice(ie "\." define . . . the string '.'), while they are only intrepreted once within . . .
1K - last updated 2009-01-30 08:36 UTC by pgas

pattern
In [[awk]], patterns are used to select lines of input for processing. The pattern within each [[rule]] . . . expression]]s for matching text within a string. The [[slash]] symbol is used as an [[enclosure]] . . .
2K - last updated 2011-05-19 18:18 UTC by markhobley

PrimeNumberSieve
This is the standard sieve of Eratosthenes implemented in portable awk. The running time of the bare . . . index into arrays (integers are converted to strings and then hashed; all array keys are strings, . . . since all array keys must be treated as strings, and therefore must all pass through the hash . . . must suffer the extra indignity of being cast to strings, which slows things down even more). Further . . .
4K - last updated 2008-06-19 05:56 UTC by gnomon

PrintASingleQuote
This question gets asked often enough that it deserves its own answer. This common question doesn't actually . . . === The Rambling Tale In order to print out the string "it said 'Hello, World!' and then returned 0", . . . because it tries to parse "Hello, World!" as a string of commands to be inserted between two singlequoted . . . strings. The first thought one might have is to surround . . . but this interacts very badly with awk's literal string syntax and the "$" field reference operator. . . .
5K - last updated 2015-07-05 09:45 UTC by pitman

printf
== Usage == === printf [ FORMAT, LIST ] === The **printf** [[variadic]] function provides generic [[string . . . facilities. This enables output of formatted strings to a [[filehandle]] or to [[standard output]] . . . language. The printf function uses the same string formatting functions as [[sprintf]], but printf . . . }}} Remember to always use a proper format string with printf, otherwise you can have some surprises, . . . especially where you are printing arbitrary strings with unknown content: {{{ echo "foo%d%sbar" . . .
2K - last updated 2011-06-09 20:34 UTC by markhobley

PrintfDynamicWidth
With modern awks, you can just do it like you would in C (though the justification is less clear; C doesn't . . . have the trivial in-line string concatenation that awk does), like so: {{{ awk . . . maxlen=length(arr[i]) printfstring="%-" maxlen "s %s\n"; for (i in arr) printf(printfstring,arr[i],i) . . .
1K - last updated 2008-11-24 08:26 UTC by pgas

PrintfDynamicWidthJapanese
With modern awks, you can just do it like you would in C (though the justification is less clear; C doesn't . . . have the trivial in-line string concatenation that awk does), like so: {{{ awk . . . maxlen=length(arr[i]) printfstring="%-" maxlen "s %s\n"; for (i in arr) printf(printfstring,arr[i],i) . . .
1K - last updated 2008-11-24 08:36 UTC by pgas

PrintingNumbers
Use printf and a format string instead of print, some examples: {{{ awk BEGIN { printf "%f", 1000001.10 . . . awk does something like printf using the format string in the variable OFMT, which contains %.6g by . . . $1+0;}' 12.123123124 # here it is printed as a string without conversion 12.1231 # same as printf . . . care that in this example $1 is considered as a string by default, while it would be considered as . . . that happens when a number is transformed into a string but not by print, this conversion is controlled . . .
2K - last updated 2009-03-04 12:34 UTC by pgas

PureEvil
Not related to awk, just for fun. Some deliberately obfuscated and evil commands: {{{ sh # squeeze the . . . | sed ':;;\;foo;s;;;;t;' #cut the first field a string separated by : (like cut -d: -f1) echo foo:moo . . .
1K - last updated 2011-09-08 14:00 UTC by pgas

qse
Not a standalone awk, but an interesting library embedding an awk interpreter, from [[https://groups.google.com/group/comp.lang.awk/browse_thread/thread/b02c0d75e49eab75/54fc2c6316d657bc?lnk=gst&q=c%2B%2B+embed#54fc2c6316d657bc| . . . awk"); /* parse the hello world script from a string */ psin.type = QSE_AWK_PARSESTD_CP; psin.u.cp . . . <= -1) FAIL (awk); // parse the source script string MyAwk::SourceString in(QSE_T("BEGIN { print . . .
4K - last updated 2011-10-27 06:25 UTC by pgas

RangeOfFields
Printing a range of fields - all fields but the first, for examples, or fields 3 through 8 - is a surprisingly . . . means that you can, for example, assign an empty string to the fields preceding and following the range . . . {{{delim[i]}}} gets filled with the delimiter string between {{{fld[i]}}} and {{{fld[i+1]}}}. {{{fld[0]}}} . . . field and it's succeeding separator to an output string. Afterwards, it appends the last field without . . . the separator to the output string and returns said string. {{{ awk # usage: extract_range(string, . . .
10K - last updated 2015-09-08 09:52 UTC by pgas

ReadDirectory
Getting a list of files in a directory is a tricky process. One might be tempted to try use ls and getline, . . . other than "/"(slash) and "\0"(null). Posix awk strings cannot contain null (undefined behavior) and . . .
2K - last updated 2013-10-03 22:35 UTC by emg

ReferenciarCampos-español
En AWK, $ es el operador para "referenciar campos". Justamente referencia el campo del registro de entrada . . . el campo i-ésimo, pero sólo si es distinto del string vacío: if ($i != "") print $i; }}} . . .
1K - last updated 2009-01-03 03:06 UTC by fcr

RepeatAString
Sometimes it is useful to have something like Perl's 'x' operator, which repeats a string N times. This . . . can be used to generate large strings for performance testing, for example, or just . . .
1K - last updated 2009-03-01 19:15 UTC by h-67-101-152-180.nycmny83.dynamic.covad.net

reverse
The [[awk]] extraction and reporting language does not provide a [[builtin]] function for reversing strings. . . . } # Call the reverse function to reverse our string BEGIN { print reverse("anut fo raj a rof tun . . .
1K - last updated 2011-06-25 05:11 UTC by pgas

RS
= Record Separator = The [[special variable]] RS is a record separator that is used to determine how . . . Here we change the record separator to an empty string: {{{ #!/bin/sh awk -v'' '{ print $1,$3 }' /home/accounts/transdata.fil . . . setting the record separator is set to an emptystring. When multiline [[record]]s are being used, . . . character, because [[nul]] is treated as a string terminator in the underlying C library. The . . . record separator to be interpreted as an empty string. . . .
3K - last updated 2013-02-19 23:11 UTC by markhobley

SedFAQ
<toc> ---- == I have a line like "abdcgfjeuPATTERNfjfhghj", I want to get the PATTERN part, why . . . I get the input line unchanged! If you had the string "foo123bar", and did {{{sed 's/123/123/'}}}, . . . occurrences of something can match the empty string "". Since the empty string has length 0, conventionally . . . it matches "before" the beginning of the string, "after" the end of the string, and between . . . any two characters in the string (if it cannot match a longer string, of course). . . .
34K - last updated 2010-02-14 17:56 UTC by waldner

Shellquote
This function ensures that strings you use as arguments to the **system()** function (or **"cmd"{{{|}}}getline** . . .
1K - last updated 2009-03-01 00:35 UTC by h-67-101-152-180.nycmny83.dynamic.covad.net

ShellQuoting
Quoting can be such a headache for the novice, in shell programming, and especially in awk. Art Povelones . . . }' }}} and that argument comes out as the single string (with embedded spaces) {{{ BEGIN { q="'";print . . .
2K - last updated 2008-11-19 07:41 UTC by pgas

SizeOfSplit
How many elements were created by split()? When I do a split on a field, e.g., {{{ awk split($1,x,"string") . . . x has (I mean other than testing for null string or doing a `for (n in x)' test)? split() is . . . use its return value: {{{ awk n = split($1, x, "string") }}} . . .
1K - last updated 2008-11-18 12:35 UTC by pgas

SizeOfSplitJapanese
split() で作られたエレメント (配列) の数はいくつでしょうか? 例えば、フィールドを分割した場合、 {{{ awk split($1,x,"string") }}} エレメント x の数はどうやって知ることができるでしょうか? . . . {{{ awk n = split($1, x, "string") }}} . . .
1K - last updated 2008-11-22 13:11 UTC by 218.231.238.51.eo.eaccess.ne.jp

special variable
Some [[variable]] names have a special meaning to the awk interpreter. == List of special variables == . . . specifies the conversion format of numerical strings | [[ENVIRON]] | An informative array that contains . . . the environment strings | [[FILENAME]] | An informative variable that . . . provides the length of the currently matched substring | [[RS]] | A control variable that specifies . . . the start index of the currently matched substring | [[SUBSEP]] | A control variable that specifies . . .
2K - last updated 2011-06-25 05:46 UTC by pgas

SplitIntoChars
In portable POSIX awk, the only way to do this is to use substr to pull out each character, one by one. . . . "a", "r", "s". If you don't have any ^As in your string, you could try: {{{ awk string=$0; gsub(".", . . . "&\001", string) n=split(string, anarray, "\001") for (i=1;i<=n;i++) . . .
1K - last updated 2008-11-24 08:20 UTC by pgas

SplitIntoCharsJapanese
In portable POSIX awk, the only way to do this is to use substr to pull out each character, one by one. . . . "a", "r", "s". If you don't have any ^As in your string, you could try: {{{ awk string=$0; gsub(".", . . . "&\001", string) n=split(string, anarray, "\001") for (i=1;i<=n;i++) . . .
1K - last updated 2008-11-24 08:35 UTC by pgas

statement
The [[awk]] extraction and reporting language is not [[imperative]]. However, [[action]]s within the . . . the statement, including the middle of a [[string]] or [[regular expression]]: {{{ # Here the . . .
2K - last updated 2011-05-21 16:43 UTC by markhobley

string
== _Literal strings are delimited using doublequotes_ In [[awk]], literal strings are delimited using . . . [[doublequote]] symbols: == _Empty strings_ A pair of consecutive [[doublequote]] symbols . . . can be used to represent an [[empty string]]. == Backslash notation can be used to include . . . to include [[special character]]s in literal strings by using [[backslash]] symbol notation to represent . . .
1K - last updated 2010-10-19 21:58 UTC by markhobley

string manipulation
* [[case conversion]] * [[length|Determine the length of a string]] * [[index|Determine the position . . . of a substring within a string]] * [[substr|Removing the first . . . and last characters from a string]] * [[reverse|Reverse a string]] * [[substr|Splicing . . . a string at arbitary positions]] * Strip whitespace from . . . a string * Strip control codes and extended characters . . .
1K - last updated 2011-07-04 22:12 UTC by markhobley

string manipulation function
The [[awk]] programming language provides a set of [[builtin]] functions for performing various string . . .
1K - last updated 2011-06-07 00:35 UTC by markhobley

substr
=== Removing the first and last characters from a string === The following [[script]] demonstrates how . . . the first and last [[character]]s from a [[string]]: {{{ awk BEGIN { mystring="knights" print . . . substr(mystring,2) # remove the first letter print substr(mystring,1,length(mystring)-1) . . . # remove the last character print substr(mystring,2,length(mystring)-2) # remove both the first . . .
1K - last updated 2011-06-25 05:10 UTC by pgas

text.2.wiki.awk
#:       C:\#\awk\lib\text.2.wiki.awk\\ . . .   A, B.. arrays;   s..v strings;   i..n integers;   w..z . . .
11K - last updated 2012-09-24 14:55 UTC by g0ph3r

text 2 wiki.awk
{{{ #: C:\#\lib\awk\utl\text_2_wiki.awk #: 2012-09-15 23:40:11 #:rod.t_2012 #: This file is http://awk.freeshell.org/text_2_wiki.awk . . . 15:46:51 #: paradigm: A, B.. arrays; s..v strings; i..n integers; w..z reals #: regular expression . . .
2K - last updated 2012-09-16 09:12 UTC by g0ph3r

tilde
== Substring containment operator == The tilde [[symbol]] can be used as a containment operator providing . . . a [[pattern]] match if a string matches a [[regular expression]]: === Non containment . . .
1K - last updated 2011-05-19 19:04 UTC by markhobley

tracert.awk
{{{ awk #:: C:\_\_u\tracert.awk #: 2014-07-06 19:47:02 #:: rod.t_2014 #:: extract basename for tracert . . . } ## _____ #: paradigm: A,B.. arrays; s..v strings; i..n ints; w..z reals #: lines with #:: are . . .
4K - last updated 2014-07-07 06:15 UTC by 212.205.56.222

truth
== Boolean Truth == A **boolean [[expression]]** has only two outcomes: **true** or **false**. In [[awk]], . . . evaluate to the numeric value 0 or to the empty string are false. The rest is true. **There is not . . . | "abc" | true | "0" | true. it's a non null string, but see below. | "" | false | " " | true a . . . 0, 00, "0", " 0".... The behaviour of awk when a string contains only zeros can be ambiguous, and may . . . to a variable, it may be treated as a non empty string and evaluated as true: {{{ $ awk 'BEGIN{var . . .
3K - last updated 2013-02-20 17:34 UTC by markhobley

variable-español
AWK no es el shell, y tampoco es Perl. Antes que nada, las variables en AWK se referencian utilizando . . . shell), no expande las variables dentro de los strings literales. No podría aunque quisiera, dado . . . distinguir entre variables y palabras en una string literal. Por tanto "Hola nombre" es un string . . . variable en el script de AWK. Para formar nuevos strings desde strings literales y variables, es posible . . . Ejemplo: {{{ # muestra la concatenación de un string y una variable print "hola " nombre; # concatena, . . .
2K - last updated 2009-01-03 04:02 UTC by fcr

variable
A '''variable''' is a symbolic name associated with a [[value]]. A variable acts as a container and the . . . [[dynamic]] and can hold either [[numeric]] or [[string]] values. === Variables do not need predefinition . . . variables are initialized to the [[empty]] string, which evaluates to [[zero]] when [[convert]]ed . . . var}' }}} === Variable names inside string constants are not expanded in awk === Secondly, . . . behave like the Unix [[shell]]. Variables inside string constants are not expanded. The [[interpreter]] . . .
3K - last updated 2012-04-22 11:42 UTC by unregistered

VariablesInRegex
The patterns between slashes like /pattern/ are called **ERE constants**, or **regular expressions literals**. . . . /var/, you are matching against the literal string "var", not against the regular expression. You . . . can still use strings in places where regular expressions are expected, . . . } }}} Also note that when you're using a string as a regular expression you must explicitly . . . match it against the string you want to check; you can NOT use the string . . .
2K - last updated 2010-11-26 08:49 UTC by 195.97.26.99

WartAndWishList
Awk is a wonderful language! That said, there are a few annoying bits... == The Good * well-documented . . . * Some strings are assignable and some are not. This is probably . . . because non-assignable strings stored as simple {ref-string, start, length} . . . triples that point into other strings. This is a net efficiency win, but this should . . . somebody give an example for non-assignable strings?)// * There is no portable built-in way of . . .
7K - last updated 2009-04-13 18:39 UTC by goedel

98 pages found.