switch (expression) {
case value|regex : statement
...
[ default: statement ]
}
The?AWKPATH?environment variable can be used to provide a list of directories thatgawk?searches when looking for files named via the?-f?and?--file?options.
If?POSIXLY_CORRECT?exists in the environment,then?gawk?behaves exactly as if?--posix?had been specified on the command line. If?--lint?has been specified,?gawk?issues a warning message to this effect.
getpid(2),?getppid(2),?getpgrp(2),?getuid(2),?geteuid(2),?getgid(2),?getegid(2),getgroups(2)
The AWK Programming Language,Alfred V. Aho,Brian W. Kernighan,Peter J. Weinberger,Addison-Wesley,1988. ISBN 0-201-07981-X.
GAWK: Effective AWK Programming,Edition 3.0,published by the Free Software Foundation,2001.
The?-F?option is not necessary given the command line variable assignment feature; it remains only for backwards compatibility.
Syntactically invalid single character programs tend to overflow the parse stack,generating a rather unhelpful message. Such programs are surprisingly difficult to diagnose in the completely general case,and the effort to do so really is not worth it.
The original version of?UNIX?awk?was designed and implemented by Alfred Aho,Peter Weinberger,and Brian Kernighan of Bell Laboratories. Brian Kernighan continues to maintain and enhance it.
Paul Rubin and Jay Fenlason,of the Free Software Foundation,wrote?gawk,to be compatible with the original version of?awk?distributed in Seventh Edition?UNIX. John Woods contributed a number of bug fixes. David Trueman,with contributions from Arnold Robbins,made?gawk?compatible with the new version of?UNIX?awk. Arnold Robbins is the current maintainer.
The initial DOS port was done by Conrad Kwok and Scott Garfinkle. Scott Deifik is the current DOS maintainer. Pat Rankin did the port to VMS,and Michal Jaegermann did the port to the Atari ST. The port to OS/2 was done by Kai Uwe Rommel,with contributions and help from Darrel Hankerson. Fred Fish supplied support for the Amiga,Stephen Davies provided the Tandem port,and Martin Brown provided the BeOS port.
This man page documents?gawk,version 3.1.5.
If you find a bug in?gawk,please send electronic mail to?. Please include your operating system and its revision,the version of?gawk?(from?gawk --version),what C compiler you used to compile it,and a test program and data that are as small as possible for reproducing the problem.
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