Further understanding the Grep! lol Post: 302860933

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Top Forums Shell Programming and Scripting Further understanding the Grep! lol Post 302860933 by Don Cragun on Monday 7th of October 2013 03:08:27 PM

10-07-2013

Registered User

Quote:

Originally Posted by emc^24sho

If I use the grep command for parsing files, does it stop parsing right after it finds the matching pattern or does it continue to parse that document?

Code:

grep -l "status" *.xml

Most implementations of the awk utility will stop reading the current file when a match is found when the -l is given on the command line. (There is no requirement that grep quit reading the file when a match is found, but it is more efficient if it is done that way and most implementations of grep try to be efficient.) Note also that if the data being read is from standard input rather than from a path operand given on the command line, that might be treated differently.

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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