Egrep help needed? Post: 302748453

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Top Forums UNIX for Advanced & Expert Users Egrep help needed? Post 302748453 by Don Cragun on Wednesday 26th of December 2012 01:33:06 AM

12-26-2012

Registered User

It isn't clear to me whether tinku91 wants one expression that will match all six words or three different patterns each matching two words. But the following script should give you what you want:

Code:

echo 'i, ii, and iii'
grep -E '(harris|SIG(STOP|TSIP|TTIN|TTOU))' reg_exp

echo 'i'
grep -E 'SIG(STOP|TSIP)' reg_exp

echo 'ii'
grep -E 'SIG(TTIN|TTOU)' reg_exp

echo 'iii'
grep -E 'harris' reg_exp

I suspect that SIGTSIP is a typo and that what is really wanted is SIGTSTP, but this script looks for what was requested. Note also that any line that contains harrison also contains harris so there is no need to check for both harris and harrison.

Note to bipinajith:

Code:

grep  "^[SIG]\{3\}\(STOP\|TSIP\)" reg_exp

is not portable; many systems don't allow backslash escaped ERE syntax in BREs. The request didn't say anything about only matching at the start of a line. And, [SIG]{3} in an ERE will match GGG, III, SSS, GGi, GGS, etc. in additional to SIG.

Last edited by Don Cragun; 12-26-2012 at 04:38 PM.. Reason: fix typo

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LEARN ABOUT NETBSD

zegrep

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

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