AwkChannelWiki: Search for: "file"

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AA-awk-one-page
http://awk.freeshell.org/AA-awk-one-page\\ 2013-09-19 20:23:02 http://awk.freeshell.org/g0ph3r\\ attempt . . . (( can be saved as a single pdf file ))\\ http://www.gnu.org/software/gawk/manual/html_node/Getting-Started.html\\ . . . http://sourceforge.net/projects/ezwinports/files/\\ ((gawk-4.1.0-2-w32-bin.zip -- requires the . . . four .dll files)\\ \\ mawk 1.3.4 2013-08-03 ((often the fastest . . .
2K - last updated 2013-09-20 06:55 UTC by g0ph3r

AllAboutGetline
//Editor's notes: The article was originally posted on the comp.lang.awk newsgroup, and can still be . . . Set| |getline|$0, ${1...NF}, NF, FNR, NR, FILENAME| |getline var|var, FNR, NR, FILENAME| |getline . . . < file|$0, ${1...NF}, NF| |getline var < file|var| . . . are: {{{ awk if/while ( (getline var < file) > 0) if/while ( (command | getline var) > . . . non-obvious effects of using it: **a)** Normally FILENAME is not set within a BEGIN section, but a non-redirected . . .
16K - last updated 2009-02-15 22:14 UTC by waldner

awk-glossary
concise glossary of the essential awk  -  Last edited 2014-08-04 02:26 UTC\\ Contents: . . .      http://sourceforge.net/projects/ezwinports/files/gawk-4.1.1-w32-bin.zip\\ . . .
5K - last updated 2014-08-04 03:23 UTC by y0tta

awk.exe
[[awk.exe]] Last edited 2013-05-27 23:57:16 PDT\\ The first is from Dr. Kernighan - the k of awk.\\ gawk . . . Mingw-w64)\\ from: http://scottn.us/downloads/\\ file: http://scottn.us/downloads/awk64.exe\\ \\ gawk.exe . . . from: http://sourceforge.net/projects/ezwinports/files/\\ (requires the four .dll files included in . . . of gawk/awk/mawk)\\ \\ mawk.exe version 1.3.4 (file date 2011-05-21)\\ (compiled with Microsoft Visual . . . from: http://invisible-island.net/mawk/\\ file: ftp://invisible-island.net/mawk/win32/mawk-vs6.zip\\ . . .
2K - last updated 2013-05-28 07:57 UTC by g0ph3r

awk Lucent Copyright notice
file FIXES from http://www.cs.princeton.edu/~bwk/btl.mirror/awk.zip ; version 20110810 {{{awk /***** . . . USE OR PERFORMANCE OF THIS SOFTWARE. *****/ This file lists all bug fixes, changes, etc., made since . . .
2K - last updated 2012-08-26 11:45 UTC by g0ph3r

awk nawk oawk
in 1977 there was awk.\\ this page attempts to explain the history of awk.\\ the 1978 7th Edition awk(1) . . . from file FIXES - lists additions/changes since the awk . . . \\ comand line: -v x=1 -v y=2\\ CONVFMT\\ nextfile\\ posix character class names like [:digit:]\\ . . . command line switch -d dumps debug info.\\ valid filenames /dev/stdin /dev/stdout /dev/stderr\\ {{{awk . . .
2K - last updated 2012-03-18 23:21 UTC by g0pher

AwkGuide
** Work in Progress ** {{{ import from Mark Hobley's wiki }}} <toc> ---- == Overview * [[Overview]] . . . operator * [[FS|field separator]] * [[file]] handling * [[floating point]] numbers * [[for . . . * [[if]] conditional constructs * [[include]] files * [[infinite loop]]s * [[input]] * [[instruction]]s . . .
4K - last updated 2011-08-14 15:57 UTC by markhobley

AwkOnWindows
[[AwkOnWindows|This page]] lists available versions of awk for ms windows.\\ Example: //awk /foo/{print(NR,$0)} . . . file// \\prints lines from //file// containing //foo//\\ . . . Brian W. Kernighan]] (bwk) - the //k// of awk.\\ File [[FIXES]] lists additions/changes since the original.\\ . . . `//The One True awk//` -- Updated May 23, 2010\\ file FIXES lists changes since "The AWK Programming . . . 156kB\\ compiled with Open Watcom C/C++ 1.4\\ file mawk-doc.txt is mawk(1) manual http://www.klabaster.com/progs/gawk32.zip . . .
2K - last updated 2010-10-24 09:39 UTC by g0pher

AwkOnWindowsHowto
AwkOnWindowsHowto\\ rough cut - needs edit {{{ 3) awk command line switches/usage from a win32 cmd.exe . . . usage: awk95.exe [-F fs] [-v var=value] [-f progfile | 'prog'] [file ...] -version or --version; print . . . -- explicit end of args -safe see above -f progfile next argument is program filename -f - read the . . . & " ^ % < > | = 5) miscellaneous valid filenames: /dev/stdin /dev/stdout /dev/stderr array . . . metacharacters: \ . ^ $ [ ] | + * ? ( ) #: filenames may Not contain: \ / : * ? " < > | . . .
3K - last updated 2010-10-24 07:44 UTC by g0pher

AwkTips
<toc> ---- == Be idiomatic! In this paragraph, we give some hints on how to write more idiomatic . . . Suppose one wants to print all the lines in a file that match some pattern (a kind of awk-grep, if . . . next} # other condition {# other actions}' file1 file2 }}} This is used when processing two files. . . . When processing more than one file, awk reads each file sequentially, one after another, . . . records read so far, regardless of how many files have been read. The value of NR starts at 1 and . . .
31K - last updated 2009-03-24 16:54 UTC by waldner

BeforeAfterMatch
Problem: print the Nth record before or after a certain regular expression matches or, alternativley, . . . {{{ sh awk 'c&&!--c;/pattern/{c=N}' file }}} ii) Print every record except the Nth record . . . {{{ sh awk 'c&&!--c{next}/pattern/{c=N}' file }}} iii) Print the N records after some pattern: . . . {{{ sh awk 'c&&c--;/pattern/{c=N}' file }}} iiii) Print every record except the N records . . . {{{ sh awk 'c&&c--{next}/pattern/{c=N}' file }}} The problems with these approaches is that . . .
3K - last updated 2009-02-28 20:38 UTC by waldner

BEGIN
== Begin Blocks The [[awk]] programming language allows us to use **begin blocks** and **end blocks** . . . that they are defined. == Special Variables === FILENAME Normally the FILENAME variable is not populated . . . a non redirected call to getline will cause FILENAME to become set. . . .
3K - last updated 2013-04-11 14:25 UTC by 92.40.253.171.threembb.co.uk

CAAN-or-caan
**caan:     the comprehensive awk archive network**\\     -or-\\ . . .   can be saved as a single pdf file: goebel's http://www.vectorsite.net/tsawk.html\\ . . . exe:http://sourceforge.net/projects/ezwinports/files/gawk-4.1.1-w32-bin.zip/download\\   . . .   has MPFR; requires the four .dll files included there\\ exe:   http://www.klabaster.com/freeware.htm\\ . . .
4K - last updated 2014-05-29 02:01 UTC by g0ph3r

CAWKLib
=CAWKLib CAWKlib is a library of functions for for awk intended to be used with preprocessors/wrappers . . . wrapper function for the 'test' shell command *file_isblock() -- returns 1 if file is a block device . . . *file_ischar() -- returns 1 if file is a character device . . . *file_isdir() -- return 1 if file is a directory *file_isthere() . . . -- returns 1 if file exists *fie_isreg() -- returns 1 if file is a . . .
5K - last updated 2015-01-29 10:14 UTC by 108-243-116-77.lightspeed.cicril.sbcglobal.net

Columnate
This script columnates the input file, so that columns line up like in the GNU column(1) command. Its . . . of **column -t**. First, awk reads the whole file, keeps track of the maximum width of each field, . . . too narrow, you'll get a handsome display of the file. For an example of the output, you can try **columnate . . .
1K - last updated 2009-02-28 21:32 UTC by h-67-101-152-180.nycmny83.dynamic.covad.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/ . . . answer]] ---- == How does awk deal with multiple files? === Version warning Some of these techniques . . . awk. === How can awk test for the existence of a file? <include "FileExistence"> [[http://awk.freeshell.org/?action=edit;id=FileExistence| . . . answer]] === How can I get awk to read multiple files? <include "ReadMultipleFiles"> [[http://awk.freeshell.org/?action=edit;id=ReadMultipleFiles| . . . Edit this answer]] === How can I tell from which file my input is coming? <include "FileName"> . . .
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/ . . . answer]] ---- == How does awk deal with multiple files? === Version warning Some of these techniques . . . awk. === How can awk test for the existence of a file? <include "FileExistenceJapanese"> [[http://awk.freeshell.org/?action=edit;id=FileExistenceJapanese| . . . answer]] === How can I get awk to read multiple files? <include "ReadMultipleFilesJapanese"> . . . Edit this answer]] === How can I tell . . .
4K - last updated 2008-11-24 09:01 UTC by pgas

ComparingTwoFiles
Sometimes it is useful to compare two files. To do this in awk, the trick is to load the data from the . . . first file into an array. Let's say for instance we have . . . a list of first names in file1, one per line: {{{ John Mary }}} and in file2 . . . Fo Mary Bar }}} We want to find the names in file2 corresponding to the first name in file1. This . . . {{{ sh awk 'FNR==NR {arr[$0];next} $1 in arr' file1 file2 }}} Some explanations: * //FNR == NR//: . . .
2K - last updated 2011-08-25 00:35 UTC by steve

ContextGrep
The following snippets print matching lines with surrounding context lines, like GNU grep's **grep -A . . . by deleting extra saved lines as you read the file, but this slows down the process significantly. . . .
3K - last updated 2011-07-01 08:32 UTC by pgas

DeleteTrailingNewlines
Simple oneliner that deletes the trailing newlines of a file: {{{ sh awk '!NF{b=b "\n";next} {printf . . . "%s%s",b,$0;b="\n"}' file }}} Explanations: * !NF : "If the line is blank . . . {printf "%s%s",b,$0;b="\n"} END {print "\n"}' file }}} . . .
1K - last updated 2008-12-31 12:07 UTC by pgas

EditInPlace
You cannot edit a file in place with awk. What you should do is direct your output to a temporary file, . . . and, if everything is fine, rename the temporary file: {{{ sh awk '{do whatever}' originalfile.txt > . . . tmpfile.txt && mv tmpfile.txt originalfile.txt . . . like mktemp to create the temporary file. (and, by the way, sed or perl, when given the . . . -i option, create a temporary file behind the scenes and then rename it anyway). . . .
1K - last updated 2009-04-11 17:29 UTC by waldner

EnvVarGeneral
**Answer 1:** On Unix, use "alternate quoting", e.g. {{{ awk -F: '$1 ~ /'"$USER"'/ {print $5}' /etc/passwd . . . portable, but doesn't work with awk "-f" script files. In that case, it's better to use a shell script . . .
3K - last updated 2011-07-05 09:31 UTC by pgas

Features of awk
The [[awk]] utility: * treats lines of a text as database records, which can be divided into fields. . . . * can manipulate the text file database in a variety of ways. * can analyse and . . . syntax * is [[data driven]] * uses [[filename association]] rather than numbered streams . . . for file input and output * supports multiple [[assignment]]s . . .
1K - last updated 2011-05-27 15:33 UTC by markhobley

file
== Filename association == The [[awk]] programming language uses [[filename association]], rather than . . . numeric [[filehandle]]s to reference open files. The awk interpreter . . . make the appropriate mappings to filehandles behind the scenes. . . .
1K - last updated 2010-12-14 19:05 UTC by markhobley

FileAndBitJoinClone
== Problem Description This was difficult to hash out. Eventually the task was described as, "for each . . . value in $3 of file.txt, print out the line from bit.txt where bit.txt:$1 . . . == file.txt:$3". Since $1 of bit.txt is always equal to . . . {{{ #!/usr/bin/awk -f BEGIN { BIT = "bit.txt" FILE = "file.txt" ERRSTR = "Guarantee violated, no . . . BL[$1] = $0 close(BIT) while ((getline $0 < FILE) > 0) print (($3 in BL) ? BL[$3] : sprintf(ERRSTR, . . .
7K - last updated 2009-03-08 16:26 UTC by waldner

FileExistence
The most portable way to test for the existence of a file is to simply try and read from the file. {{{ . . . awk function exists(file, dummy, ret) { ret=0; if ( (getline dummy < . . . file) >=0 ) { # file exists (possibly empty) and . . . can be read ret = 1; close(file); } return ret; } }}} [ I've read reports that . . . the `test' utility {{{ awk if (system("test -r " file) == 0) # file is readable else # file is not readable . . .
1K - last updated 2008-11-18 13:26 UTC by pgas

FileExistenceJapanese
The most portable way to test for the existence of a file is to simply try and read from the file. {{{ . . . awk function exists(file, dummy, ret) { ret=0; if ( (getline dummy < . . . file) >=0 ) { # file exists (possibly empty) and . . . can be read ret = 1; close(file); } return ret; } }}} [ I've read reports that . . . the `test' utility {{{ awk if (system("test -r " file) == 0) # file is readable else # file is not readable . . .
1K - last updated 2008-11-24 08:07 UTC by pgas

FileName
the file name is stored in the built-in variable FILENAME: {{{ awk '/^#include/ {print FILENAME,$2}' . . .
1K - last updated 2008-11-18 13:31 UTC by pgas

FileNameJapanese
the file name is stored in the built-in variable FILENAME: {{{ awk '/^#include/ {print FILENAME,$2}' . . .
1K - last updated 2008-11-24 08:08 UTC by pgas

FirstFile
you can tell if awk is parsing the first file given on the command line using FILENAME, thusly: {{{ awk . . . BEGIN { rulesfile="" } rulesfile == "" { rulesfile = FILENAME; } . . . FILENAME == rulesfile { build_rule($0); } FILENAME . . . != rulesfile { apply_rule($0); } }}} Example: Suppose you have . . . old lines with new lines. {{{ awk BEGIN { rulesfile="" } rulesfile == "" { rulesfile = FILENAME; } . . .
1K - last updated 2008-11-18 13:34 UTC by pgas

FirstFileJapanese
you can tell if awk is parsing the first file given on the command line using FILENAME, thusly: {{{ awk . . . BEGIN { rulesfile="" } rulesfile == "" { rulesfile = FILENAME; } . . . FILENAME == rulesfile { build_rule($0); } FILENAME . . . != rulesfile { apply_rule($0); } }}} Example: Suppose you have . . . old lines with new lines. {{{ awk BEGIN { rulesfile="" } rulesfile == "" { rulesfile = FILENAME; } . . .
1K - last updated 2008-11-24 08:09 UTC by pgas

FIXES
[[FIXES]]        revised:   . . . bugs. Updated Dec 20, 2012\\ File FIXES from the  [[http://www.cs.princeton.edu/~bwk/btl.mirror/|source]] . . . code:  "This file lists all bug fixes,\\     changes, . . . it would have been opened if it were a filename (p 63).\\ added some missing ansi printf conversion . . . a separate -v for each assignment.\\ \\ FILENAME is now defined in the BEGIN block (Oct 11, . . .
6K - last updated 2014-01-15 23:17 UTC by g0ph3r

FNR
The *FNR* informative [[special variable]] is used to track the number of [[record]]s that have so far . . . been read from the current [[input]] file. It is incremented each time a new [[record]] . . . from [[input]] and is reset to zero, when a new file is started. === Adding line numbers to a file . . . to give a simple way of adding line numbers to a file using [[awk]]: awk '{print FNR,$0 }' filename . . .
1K - last updated 2011-05-08 11:04 UTC by markhobley

FormatFileSizes
From time to time people ask how to sort the output of {{{du -h}}}. This is not particularly easy, since . . .
1K - last updated 2008-11-29 05:22 UTC by gnomon

Frequently Asked Questions
Some entries of this page have been copied from the [[comp.lang.awk_FAQ]]([[http://awk.freeshell.org/comp.lang.awk_FAQ#toc29|Credits]]) . . . Edit this answer]] ---- == How do I edit a file in place with awk? <include "EditInPlace"> . . .
3K - last updated 2015-09-08 08:46 UTC by pgas

FS
= Field Separator = The [[special variable]] FS is a field separator that is used to determine how [[awk]] . . . separator is a single space character. In data files, fields are often separated by multiple whitespace . . . [[field]] information from the /etc/passwd file: {{{ >awk -F: '{print $1,$3 }' /etc/passwd . . .
5K - last updated 2013-02-19 21:45 UTC by markhobley

g0pher
Notes: [[g0pher]] from [[irc://irc.freenode.net//#awk|#awk channel on freenode]]. *Latest (2012-03-18) . . . statistics."\\ (early eight page awk_V7.pdf in file [[http://sourceforge.net/projects/gnuwin32/files/mawk/1.3.3-1/ . . . summary of gawk(3.1.7)/awk/mawk.\\ **the help file gawk.hlp 3.1.3 under doc folder in [[http://sourceforge.net/projects/gnuwin32/files/gawk/3.1.3-2/ . . . *Interesting discussion using awk/mawk on large files and comparison to other languages.\\ "Don’t MAWK . . .
2K - last updated 2013-05-28 04:13 UTC by g0ph3r

gawkism
Gawkisms are non portable syntax components that do not work with some awk implementations. The use of . . . (bitwise function) * [[mktime]] function * [[nextfile]] * [[newline]] characters after certain [[symbol]]s . . .
2K - last updated 2011-05-19 22:29 UTC by markhobley

getline
The *getline* command can obtain input from any number of files and does not require a command line parameter . . . to be provided for the [filename]. The following summarises six variants of . . . Set* | getline | $0, ${1...NF}, NF, FNR, NR, FILENAME | getline foobar | foobar, FNR, NR, FILENAME . . . function. In [[awk]], output to a specific file is achieved by using [[redirection]]. . . .
1K - last updated 2011-05-02 20:14 UTC by markhobley

hashbang
== A script can be treated as an executable file by using a hashbang == It is possible for an awk script . . . to be treated as an executable file by including a hashbang line as the first line . . .
1K - last updated 2010-11-28 19:04 UTC by markhobley

HomePage
This wiki is maintained by regulars from the **#awk** channel on **[[https://libera.chat/|irc.libera.chat]]** . . . in a string * RepeatAString n times * FormatFileSizes in human readable format * LevenshteinEditDistance . . . under a variety of implementations * ComparingTwoFiles an example * DeleteTrailingNewlines * [[Adler32Checksum]] . . . in pure awk * [[Columnate]] a file * [[ContextGrep]] -- print context lines around . . . for use in shell commands * [[Transpose]] a file * [[SimpleCalc]] simple 4 operations calculator....no . . .
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]] * [[LevenshteinEditDistance|2 . . . 2 つの少し異なる方法で実装した素数]] * [[ComparingTwoFiles|2 つのファイルの比較例]] * [[DeleteTrailingNewlines|最後の改行の抑制]] . . . ** ajai / mib の [[FileAndBitJoinClone|ファイルとビット結合]]、これは file.txt と呼ばれるファイルの中で参照している . . .
5K - last updated 2008-10-19 07:34 UTC by hi saito

include
The [[awk]] extraction and reporting language does not support the use of include files. However, it . . . to provide the name of more than one source file at the command line. === _Using multiple source . . . files_ In awk, it is possible to provide the name of . . . more than one source file at the command line by using multiple !-f switches: . . . two.awk }}} === _Functions in different source files will be visible_ The functions defined in different . . .
2K - last updated 2013-03-30 10:38 UTC by markhobley

Inicio
Este wiki es mantenido por los usuarios del cenal **#awk** en **[[http://www.freenode.net|irc.freenode.net]]**. . . . that their OS offers a proper /net entry in the filesystem, making such language-level extensions ugly . . . in a string * RepeatAString n times * FormatFileSizes in human readable format * LevenshteinEditDistance . . . under a variety of implementations * ComparingTwoFiles an example * DeleteTrailingNewlines * [[Adler32Checksum]] . . . listed by the lshal utility ** ajai / mib's FileAndBitJoinClone, which was used to print out the . . .
7K - last updated 2009-02-12 23:31 UTC by fcr

input
The [[awk]] utility can take its input from [[standard input]] or from [[file]]s. If no input files are . . . particular data [[field]]. == Taking input from files == The [[awk]] utility reads its input [[file]]s . . . enables [[awk]] to take input from a particular file without the need to specify the filename as a . . . provides the record number within the current file | [[FS]] | A control variable that specifies the . . .
2K - last updated 2011-05-19 22:40 UTC by markhobley

LargestAccurateNumber
Most [[awk]] implementations use floating point double precision to represent every kind of numeric value. . . . trying to sum up large numbers in very large log files: when is it safe to rely on awk's numbers and . . .
3K - last updated 2013-04-12 14:52 UTC by ttmrichter

LinksPage
<toc> ---- == websites dedicated to awk == * [[http://awk.info/|awk.info]] news and articles about . . . that their OS offers a proper /net entry in the filesystem, making such language-level extensions ugly . . . with "W"]] * an interview . . .
4K - last updated 2015-02-24 14:45 UTC by pgas

mawk wish list
[[mawk_wish_list]]\\ mawk 1.3.4 from Thomas Dickey http://invisible-island.net/mawk/\\ his mawk is even . . . it is 3X ~~ 10X faster than awk or gawk\\ \\see file http://invisible-island.net/mawk/CHANGES for list . . . WHINY_USERS sorted-array feature;\\ nextfile; "/dev/stdin" name for stdin\\ My wish list for . . .
2K - last updated 2013-05-28 04:04 UTC by g0ph3r

MicrosoftWindowsInstallation
== Installation of an awk interpreter in Microsoft Windows The awk installer file is mawk-1.3.3-1-bin.zip . . . Copy the installer file to C:\WINDOWS\TEMP\ Extract the .zip file to C:\WINDOWS\TEMP\ . . . Administrator, it is necessary to associate .awk files with the awk interpreter C:\AWK\BIN\MAWK.EXE . . .
1K - last updated 2009-07-10 18:46 UTC by MarkHobley

MultipleFiles
<toc> === Version warning Some of these techniques will require non-ancient versions of awk. === . . . How can awk test for the existence of a file? <include "FileExistence"> [[http://awk.freeshell.org/?action=edit;id=FileExistence| . . . answer]] === How can I get awk to read multiple files? <include "ReadMultipleFiles"> [[http://awk.freeshell.org/?action=edit;id=ReadMultipleFiles| . . . Edit this answer]] === How can I tell from which file my input is coming? <include "FileName"> . . . [[http://awk.freeshell.org/?action=edit;id=FileName| Edit this answer]] === How can I get awk . . .
2K - last updated 2008-11-18 13:38 UTC by pgas

NF
= Number of Fields = The [[special variable]] NF holds the number of [[field]]s in the [[current record]]. . . . from each [[record]]: {{{ awk '{ print $1,$NF }' filename }}} . . .
1K - last updated 2011-05-28 15:14 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 . . . line 1 }}} ==== No FNR variable: {{{sh $ cat file1 a $ cat file2 b $ /usr/xpg4/bin/awk 'NR==FNR{print}' . . . file1 file2 a $ /usr/bin/awk 'NR==FNR{print}' file1 . . . file2 }}} ==== No match() function: {{{sh $ /usr/xpg4/bin/awk . . . '{print match($0,"a")}' file1 file2 1 0 $ /usr/bin/awk '{print match($0,"a")}' . . .
5K - last updated 2012-01-24 08:29 UTC by pgas

OpeningFiles
You can open files dynamically using `getline', `close', and `print EXPR > FILENAME', like: {{{ awk . . . # assumes input file has at least 1 line, output file writeable function . . . double(infilename,outfilename, aline) { while ( (getline aline . . . < infilename) >0 ) print(aline aline) > outfilename; . . . close(infilename); close(outilename); } }}} . . .
1K - last updated 2008-11-18 13:33 UTC by pgas

OpeningFilesJapanese
You can open files dynamically using `getline', `close', and `print EXPR > FILENAME', like: {{{ awk . . . # assumes input file has at least 1 line, output file writeable function . . . double(infilename,outfilename, aline) { while ( (getline aline . . . < infilename) >0 ) print(aline aline) > outfilename; . . . close(infilename); close(outilename); } }}} . . .
1K - last updated 2008-11-24 08:09 UTC by pgas

output
== output == === standard output === === output to files === The [[awk]] programming language uses a . . . system of named files, rather than numbered [[stream]]s for output . . . channels. Output to a file is achieved by using [[redirection]] operators. . . . [[redirection]] has been defined, the output file remains open until a [[close]] command is encountered, . . .
1K - last updated 2010-11-16 00:44 UTC by markhobley

Overview
= Overview of awk = == The primarily purpose of awk is to processing textual data to produce formatted . . . If more than one [[pattern]] matches the [[input file]], then the [[action]] associated with each [[pattern]] . . . comparisons for the first line of the [[input file]], the cycle is repeated for each of the subsequent . . . summaries: == It is possible to process multiple files using patterns and actions == Using [[awk]], . . . it is possible to search one or more files for specified [[pattern]] matches and performing . . .
4K - last updated 2011-05-23 23:09 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, . . . in map { ... }' }}} * If you want to compare two files with awk (doesn't work if {{{file1}}} is empty). . . . following code snippet passes an array via {{{file1}}}: {{{ sh awk ' # cmp as awk program NR == FNR . . . } END { exit (NR != 2 * FNR || result + 0) } ' file1 file2 }}} With gawk one could use {{{ARGIND == . . . == FNR}}}, which is working also for an empty file {{{file1}}}. For an explanation of this technique . . .
1K - last updated 2009-04-13 22:51 UTC by goedel

PassingVariablesToTheParentProcess
How can I put values into the environment of the program that called my awk program? Short answer, you . . . in a form the shell can parse to a temporary file, and have the shell "source" the file after running . . .
1K - last updated 2008-11-19 07:45 UTC by pgas

PassingVariablesToTheParentProcessJapanese
How can I put values into the environment of the program that called my awk program? Short answer, you . . . in a form the shell can parse to a temporary file, and have the shell "source" the file after running . . .
1K - last updated 2008-11-24 08:05 UTC by pgas

PrintASingleQuote
This question gets asked often enough that it deserves its own answer. This common question doesn't actually . . . way is simply to write the program in its own file. There may also be shell-specific ways for working . . .
5K - last updated 2015-07-05 09:45 UTC by pitman

printf
== Usage == === printf [ FORMAT, LIST ] === The **printf** [[variadic]] function provides generic [[string . . . This enables output of formatted strings to a [[filehandle]] or to [[standard output]] in a similar . . . printf "%s ", $i;print ""}' filename }}} Do NOT print the first word on each line: . . . printf "%s ", $i;print ""}' filename }}} Print 3rd to 5th words in each line: {{{ . . . printf "%s ", $i;print "" }' filename }}} Print the first to the eighth word on . . .
2K - last updated 2011-06-09 20:34 UTC by markhobley

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| . . . its return value. * customizing I/O handlers for file, pipe, console I/O. * creating multiple interpreters . . .
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 . . . {printf "%s%s",sep, $i;sep=" "}; printf "\n"}' file # or, avoids using sep awk '{for (i=2;i<=NF;i++) . . . "%s%s",(i>2?" ":""), $i}; printf "\n"}' file # uses OFS and ORS awk '{for (i=2; i<=NF; i++) . . . printf("%s%s", $i, i==NF ? ORS : OFS)}' file }}} A loop to select individual fields will also . . . file }}} will remove the first "n" fields from the . . .
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, . . . ls is a bad idea]]. A file name can contain any character other than "/"(slash) . . . '%s/' *" while (cmd | getline > 0) if ($0) files[n++] = $0 close(cmd) for (f in files) printf("/%s/\n", . . . files[f]) } }}} Assuming that dir is passed in to awk . . . {{{ sh awk "-vdir=$HOME" -f readfiles }}} If you only want directories, use "*/" instead . . .
2K - last updated 2013-10-03 22:35 UTC by emg

ReadMultipleFiles
awk automatically reads multiple files (under Unix at least) -- use something like: {{{ awk '/^#include/ . . .
1K - last updated 2008-11-18 13:30 UTC by pgas

ReadMultipleFilesJapanese
awk automatically reads multiple files (under Unix at least) -- use something like: {{{ awk '/^#include/ . . .
1K - last updated 2008-11-24 08:08 UTC by pgas

Recursively Include C headers
=== Problem Specification i want to generate one big .hpp file out of multiple .hpp files and want to . . . include the text of all #include "foo.hpp" file recursively === Code {{{ awk #!/usr/bin/awk -f . . . ip, /:/) } { print_line($0) } function print_file(file, line) { while (getline line < file > . . . 0) print_line(line) close(file) } function print_line(line, f, file) { if (match(line, . . . \t]*#include[ \t]*"/, "", f) sub(/"/, "", f) file = complete_path(f) if (!(file in list_of_paths)) . . .
1K - last updated 2011-12-11 05:33 UTC by pgas

redirection
The awk scripting language provides support for redirection via the greaterthan, doublebeak and pipe . . . output from a function to be written to a named file. If the named file exists, its contents will be . . . from the function: {{{ awk BEGIN { # Creates a file foobar.txt # If the file already exists, its contents . . . to the greaterthan symbol, but instead of the file being overwritten, the output from the function . . . will be appended to the end of the file: {{{ awk BEGIN { # Append a message to the end . . .
2K - last updated 2011-06-25 05:12 UTC by pgas

RS
= Record Separator = The [[special variable]] RS is a record separator that is used to determine how . . . separator in the middle of processing an input file == If the value of the record separator is changed . . . in the middle of processing an input file, then the new value of the record separator will . . . treated as part of a record and the end of the file will always be treated as the end of the record. . . .
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 . . . markup. ---- == Can sed edit a file "in place"? Certain versions of sed can edit "in . . . used as extension to create a backup copy of the file before modification. For example, {{{ sed sed . . . -i.bak 's/foo/bar/g' *.txt }}} will edit all the files that match *.txt, but after sed is done you'll . . . find an equal number of .txt.bak files created by sed that are copies of the original . . .
34K - last updated 2010-02-14 17:56 UTC by waldner

Shells
The examples using quoting are intended for use with any standard (sh-compatible-quoting) Unix shell. . . . and MS-Windows, less impossible) when put in a file and invoked with `awk -f filename.awk' instead. . . .
1K - last updated 2008-11-19 07:37 UTC by pgas

ShellsJapanese
The examples using quoting are intended for use with any standard (sh-compatible-quoting) Unix shell. . . . and MS-Windows, less impossible) when put in a file and invoked with `awk -f filename.awk' instead. . . .
1K - last updated 2008-11-24 08:04 UTC by pgas

special variable
Some [[variable]] names have a special meaning to the awk interpreter. == List of special variables == . . . array that contains the environment strings | [[FILENAME]] | An informative variable that provides . . . the current input [[filename]] | [[FNR]] | An informative variable that . . . provides the number of records read from current file | [[FS]] | A control variable that specifies the . . .
2K - last updated 2011-06-25 05:46 UTC by pgas

SpecialFile
You can use `-v rulesfile=filename' to process a file differently, like you would any other variable, . . . your BEGIN statement. {{{ awk BEGIN \ { if (rulesfile=="") { print "must use -v rulesfile=filename"; . . . exit(1); } while ( (getline < rulesfile) >0 ) replace[$1]=$0; close(rulesfile); } { . . .
1K - last updated 2008-11-18 13:37 UTC by pgas

SpecialFileJapanese
You can use `-v rulesfile=filename' to process a file differently, like you would any other variable, . . . your BEGIN statement. {{{ awk BEGIN \ { if (rulesfile=="") { print "must use -v rulesfile=filename"; . . . exit(1); } while ( (getline < rulesfile) >0 ) replace[$1]=$0; close(rulesfile); } { . . .
1K - last updated 2008-11-24 08:09 UTC by pgas

text.2.wiki.awk
#:       C:\#\awk\lib\text.2.wiki.awk\\ . . . This file is http://awk.freeshell.org/text.2.wiki.awk       . . . text; use {{&#123 for .txt files or #{{&#123 for .awk files\\ . . . or ::{{&#123 for .cmd files or ;{{&#123 for .ini files.\\ . . . $ . [ ] | ( ) * + ? escape with \ }}} \\ {{{ #: filenames may Not contain: \ / : * ? " < > | . . .
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 . . . \ ^ $ . [ ] | ( ) * + ? escape with \ #: filenames may Not contain: \ / : * ? " < > | . . . [/low|/high] [/wait] [/b] cmd #: start /wait exefile & call echo.^%ERRORLEVEL^% #: %u%nircmd.exe . . . exec show|hide|min|max exefile opts #: shexec open|print filename #: \a \007 . . .
2K - last updated 2012-09-16 09:12 UTC by g0ph3r

tracert.awk
{{{ awk #:: C:\_\_u\tracert.awk #: 2014-07-06 19:47:02 #:: rod.t_2014 #:: extract basename for tracert . . . BEGIN { _nul = ""; _q = "|"; _sysmul = 1; _awkfile = "C:/_/_u/tracert.awk"; _awk = ARGV[0]; if(_env("ComSpec")) . . . = cmd; print("\n\t" _dt() "\t" _awk, "-f " _awkfile, \ "\n\t_cmd = " (_q)(_cmd)_q, \ "\t_con = " (_q)(_con)_q); . . . \136 is ^ s = _awk " -v s=\\136##: $0~s " _awkfile; s = s " | " _awk " -f " _awkfile; s = s " -v . . . metachars: \ / ^ $ . [ ] | ( ) * + ? #: filenames may Not contain: \ / : * ? " < > | . . .
4K - last updated 2014-07-07 06:15 UTC by 212.205.56.222

Transpose
To transpose a N rows x M columns file into a M rows x N column file, one approach is to read the whole . . . file in memory as a bidimensional array, and finally . . .
1K - last updated 2011-03-20 06:53 UTC by ppp089210038204.dsl.hol.gr

XMLScraping
You cannot easily parse xml with awk. But there are several tricks to scrap an xml file: <toc> . . .
2K - last updated 2011-11-23 15:06 UTC by pgas

80 pages found.