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Top Forums UNIX for Advanced & Expert Users Counting the number of repetition of a pattern Post 302507557 by an2up on Thursday 24th of March 2011 07:36:01 AM
Old 03-24-2011
but listen, this is not my Q,, I was assign a task.. where I have to find all those filenames, inside the files where the pattern "a" is used only once..
Quote:
I wrote a script..
Code:
for i in *; do if [ `grep -o "a" $i | wc -l` -eq 1 ]; then echo "file is "$i; fi; done

this works fine... but I was asked in interview, how to perform it by command
 

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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 invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other 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 the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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