AwkChannelWiki: Search for: "getline"

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AllAboutGetline
//Editor's notes: The article was originally posted on the comp.lang.awk newsgroup, and can still be . . . about getline]] Note that the article, besides giving a very . . . complete overview about getline usage, also reflects a specific point of view . . . "good" or "correct" and "bad" or "wrong" uses of getline. Of course, although the author is a well-known . . . his own view (see the periodic debates about getline on comp.lang.awk for an example). So my advice . . .
16K - last updated 2009-02-15 22:14 UTC by waldner

AwkGuide
** Work in Progress ** {{{ import from Mark Hobley's wiki }}} <toc> ---- == Overview * [[Overview]] . . . * [[FS]] * [[function]]s * [[gawkism]]s * [[getline]] * [[goto]] * [[grouping arguments]] * [[hashbang]] . . .
4K - last updated 2011-08-14 15:57 UTC by markhobley

AwkOnWindowsHowto
AwkOnWindowsHowto\\ rough cut - needs edit {{{ 3) awk command line switches/usage from a win32 cmd.exe . . . eg system("%awk% BEGIN{exit(256)}) #: s|getline; n = close(s); is ok Except when n=-1 then . . .
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 . . . MNO345JJJ; PQR678KKK; }}} An approach using getline is: {{{ awk '{while(!/;$/){getline n;$0=$0 . . . file }}} That works, but uses the controversial getline function, and is not robust (since it will . . .
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, . . . N before or after the match. In the [[AllAboutGetline]] article, Ed Morton suggestes the following . . .
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** . . . BEGIN section. However, 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

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]] === ENVIRON[] and "env"|getline <include "ENVIRON"> [[http://awk.freeshell.org/?action=edit;id=ENVIRON| . . .
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]] === ENVIRON[] and "env"|getline <include "ENVIRONJapanese"> [[http://awk.freeshell.org/?action=edit;id=ENVIRONJapanese| . . .
4K - last updated 2008-11-24 09:01 UTC by pgas

ENVIRON
Modern versions of new awk (gawk, mawk, Bell Labs awk, any POSIX awk) all provide an array named ENVIRON. . . . system before you depend on it! while ( ("env" | getline line) >0 ) { varname=line varvalue=line . . .
1K - last updated 2008-11-19 13:13 UTC by pgas

ENVIRONJapanese
Modern versions of new awk (gawk, mawk, Bell Labs awk, any POSIX awk) all provide an array named ENVIRON. . . . system before you depend on it! while ( ("env" | getline line) >0 ) { varname=line varvalue=line . . .
1K - last updated 2008-11-24 08:05 UTC by pgas

FileAndBitJoinClone
== Problem Description This was difficult to hash out. Eventually the task was described as, "for each . . . no value for %s in %s (%s, line %s)\n" while ((getline $0 < BIT) > 0) BL[$1] = $0 close(BIT) . . . while ((getline $0 < FILE) > 0) print (($3 in BL) ? BL[$3] . . .
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. {{{ . . . function exists(file, dummy, ret) { ret=0; if ( (getline dummy < file) >=0 ) { # file exists (possibly . . . of mawk would write to stderr as well as getline returning <0 -- is this still true? ] On . . .
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. {{{ . . . function exists(file, dummy, ret) { ret=0; if ( (getline dummy < file) >=0 ) { # file exists (possibly . . . of mawk would write to stderr as well as getline returning <0 -- is this still true? ] On . . .
1K - last updated 2008-11-24 08:07 UTC by pgas

FIXES
[[FIXES]]        revised:   . . . BEGIN block (Oct 11, 1989)\\ "-" means stdin in getline as well as on the commandline.\\ Added \x to . . . creation (cmd**{{{|}}}**getline, print **{{{|}}}**, system),\\     and . . . (in windows)\\ cmd **{{{|}}}** getline;  n = close(cmd);  n . . .
6K - last updated 2014-01-15 23:17 UTC by g0ph3r

GeoLocation
{{{ awk #!/bin/gawk -f function getcoord(string, a) { split(string, a, ":") gsub(/\"/, "", a[2]) return . . . socket NR = 0 in_body = 0 while (socket |& getline) { if (in_body) return $0 if (/^\r$/) in_body . . .
1K - last updated 2011-11-14 16:35 UTC by pgas

getline
The *getline* command can obtain input from any number of files and does not require a command line parameter . . . The following summarises six variants of getline applications, listing which variables are set . . . by each one: | *Variant* | *Variables Set* | getline | $0, ${1...NF}, NF, FNR, NR, FILENAME | getline . . . foobar | foobar, FNR, NR, FILENAME | getline < foobar.txt | $0, ${1...NF}, NF | getline . . . foobar < foobar.txt | foobar | {{{foo | getline}}} | $0, ${1...NF}, NF | {{{foo | getline}}} . . .
1K - last updated 2011-05-02 20:14 UTC by markhobley

HomePage
This wiki is maintained by regulars from the **#awk** channel on **[[https://libera.chat/|irc.libera.chat]]** . . . ok, you don't want to use a parser * All about getline, by Ed Morton (comp.lang.awk): [[AllAboutGetline]] . . .
5K - last updated 2023-06-26 04:15 UTC by HappMacDonald

input
The [[awk]] utility can take its input from [[standard input]] or from [[file]]s. If no input files are . . . input have been read. == Obtaining input using getline == The [[getline]] command enables [[awk]] . . .
2K - last updated 2011-05-19 22:40 UTC by markhobley

limitation
== Limitations of awk Some traditional versions of [[awk]] derived from [[Unix]] version 7, may not conform . . . actions, and contains no instances of [[getline]], then the program should simply execute the . . .
1K - last updated 2009-04-20 15:50 UTC by Mark Hobley

LinksPage
<toc> ---- == websites dedicated to awk == * [[http://awk.info/|awk.info]] news and articles about . . . | All about getline from comp.lang.awk]] *a trio of articles written . . .
4K - last updated 2015-02-24 14:45 UTC by pgas

OpeningFiles
You can open files dynamically using `getline', `close', and `print EXPR > FILENAME', like: {{{ awk . . . double(infilename,outfilename, aline) { while ( (getline aline < infilename) >0 ) print(aline . . .
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 . . . double(infilename,outfilename, aline) { while ( (getline aline < infilename) >0 ) print(aline . . .
1K - last updated 2008-11-24 08:09 UTC by pgas

PassingVariables
<toc> === Shells <include "Shells"> [[http://awk.freeshell.org/?action=edit;id=Shells| Edit . . . Edit this answer]] === ENVIRON[] and "env"|getline <include "ENVIRON"> [[http://awk.freeshell.org/?action=edit;id=ENVIRON| . . .
1K - last updated 2008-11-19 07:47 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, . . . && printf '%s/' *" while (cmd | getline > 0) if ($0) files[n++] = $0 close(cmd) . . . "cd \""dir"\" && printf '%s\\0' *" cmd | getline close(cmd) patsplit($0, files, "[^\0]+") for . . .
2K - last updated 2013-10-03 22:35 UTC by emg

Recursively Include C headers
=== Problem Specification i want to generate one big .hpp file out of multiple .hpp files and want to . . . } function print_file(file, line) { while (getline line < file > 0) print_line(line) close(file) . . .
1K - last updated 2011-12-11 05:33 UTC by pgas

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

SpecialFile
You can use `-v rulesfile=filename' to process a file differently, like you would any other variable, . . . and then use a `getline' loop (and `close') in your BEGIN statement. . . . 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, . . . and then use a `getline' loop (and `close') in your BEGIN statement. . . . 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

tracert.awk
{{{ awk #:: C:\_\_u\tracert.awk #: 2014-07-06 19:47:02 #:: rod.t_2014 #:: extract basename for tracert . . . printf("\n\t%s%s", _dt(), t) > _con; getline < _con; exit(0 + _exitcode); } function . . . return(""); } function _dt( s) { _dtcmd | getline s; close(_dtcmd); sub(/[.].*/, "", s); gsub(" . . .
4K - last updated 2014-07-07 06:15 UTC by 212.205.56.222

XMLScraping
You cannot easily parse xml with awk. But there are several tricks to scrap an xml file: <toc> . . . attribute name: {{{ sh awk -v RS='"' '/foo=$/{getline;print}' }}} * another possibility, use the . . .
2K - last updated 2011-11-23 15:06 UTC by pgas

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