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Special Forums UNIX Desktop Questions & Answers egrep query....request for help Post 302425649 by tmn0004676 on Friday 28th of May 2010 07:16:44 PM
Old 05-28-2010
So I was wrong! I thought the pipe in:

egrep '(Jolly)|(Brewers)' public

meant OR...i.e Jolly OR Brewers....and not both. I guess it must be the brackets that change the meaning slightly

A very similar question comes from Solaris SCSAS exam


Quote:
Originally Posted by pseudocoder
Maybe this excerpt from the egrep man page will help you to better understand how egrep works, note the sentence that I have underlined:

DESCRIPTION
grep searches the named input FILEs (or standard input if no files are
named, or the file name - is given) for lines containing a match to the
given PATTERN. By default, grep prints the matching lines.


---------- Post updated at 00:54 ---------- Previous update was at 00:50 ----------

Code:
$ egrep '(Jolly)|(Brewers)' public
Jolly Brewers
$ egrep -o '(Jolly)|(Brewers)' public
Jolly
Brewers
$

 

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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci- fied, 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 zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep zgrep string files for csh: (setenv GREP fgrep; zgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1) ZGREP(1)
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