SIGPIPE and EPIPE Post: 302574124

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Top Forums Programming SIGPIPE and EPIPE Post 302574124 by Corona688 on Wednesday 16th of November 2011 02:13:12 PM

11-16-2011

Registered User

SIGPIPE is for situations like this:

Code:

grep "pattern" < reallyhugefile | head

grep might print millions of lines, but head only reads 10 then quits. Once head closes the read-end and quits, grep gets SIGPIPE, which kills it, forcing it to quit early instead of processing the entire file uselessly.

If you don't want your program to be killed, handle or block SIGPIPE yourself. You will start getting write-errors with errno set to EPIPE instead.

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LEARN ABOUT NETBSD

zgrep

ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME

     zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files

SYNOPSIS

     zgrep [grep-flags] [--] pattern [files ...]

     zegrep [grep-flags] [--] pattern [file ...]

     zfgrep [grep-flags] [--] pattern [file ...]

DESCRIPTION

     zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1).

     The grep-flags and pattern arguments are passed on to grep(1).  If an -e flag is found in the grep-flags, zgrep will not look for a pattern
     argument.

     zegrep calls egrep(1), while zfgrep calls fgrep(1).

EXIT STATUS

     In case of missing arguments or missing pattern, 1 will be returned, otherwise 0.

SEE ALSO

     egrep(1), fgrep(1), grep(1), gzip(1), zcat(1)

AUTHORS

     Thomas Klausner <wiz@NetBSD.org>

BSD
								 December 28, 2003							       BSD