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Full Discussion: selective grep
Top Forums UNIX for Dummies Questions & Answers selective grep Post 302592359 by verse123 on Monday 23rd of January 2012 03:49:43 PM
Old 01-23-2012
selective grep

Hello,

I have been using the command below for file manipulation.

Code:
while read A B; do grep $f1; done < f2 > f3

So, if a certain string is found in f2 (for ex; DOG243435) and it is also present in f1, then print that string plus the contents of the line in which it was found onto f3.

this works great, however, I wanted to know how I can avoid grepping for a string if a certain phrase is stated before that string. In the example below, if the word contained appears, I do not want to grep the string "DOG23244" after it.. How can I avoid only grepping DOG00912 and the contents of that line and NOT DOG23244 if the word contained appears?

Quote:
12 aasa 1d "DOG23434"
13 aass 2d "DOG00912" contained in "DOG23244"
 

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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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