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Full Discussion: question on egrep
Top Forums UNIX for Dummies Questions & Answers question on egrep Post 302074053 by jim mcnamara on Friday 19th of May 2006 10:25:19 AM
Old 05-19-2006
This works:
Code:
 egrep '^(a)(a)?' filename

test:
Code:
kcsdev:/home/jmcnama> cat filename
a
aa
aaa
aaaa
aaaaa
aaaaaa
123456
ABCDEF



kcsdev:/home/jmcnama> egrep '^(a)(a)?' filename
a
aa
aaa
aaaa
aaaaa
aaaaaa

Note:
Code:
 egrep '^(a)+$' filename

is closer to correct - correct being 'find a line of any non-zero length that has only the letter a'

Last edited by jim mcnamara; 05-19-2006 at 04:36 PM..
 

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BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME
bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression SYNOPSIS
bzgrep [ grep_options ] [ -e ] pattern filename... bzegrep [ egrep_options ] [ -e ] pattern filename... bzfgrep [ fgrep_options ] [ -e ] pattern filename... DESCRIPTION
Bzgrep is used to invoke the grep on bzip2-compressed files. All options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If bzgrep is invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, bzgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep bzgrep string files for csh: (setenv GREP fgrep; bzgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux. SEE ALSO
grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1) BZGREP(1)
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