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Top Forums UNIX for Dummies Questions & Answers Importance of \ [ ] + ? in grep Post 302353786 by tinku on Wednesday 16th of September 2009 08:19:25 AM
Old 09-16-2009
Thanks thanhdat.

Just want to know whether my understandin of the below expression is correct.

grep -o "0034\([0-9]\)\+" => This will fetch all numbers starting with 0034
grep -o "0034[0-9]\+" => This will fetch anything that follows 0034. Say for example: 003483744 0034abcd
But the first one picks only 0034, followed by numbers. Am I Right?

Thanks,
Nanda
 

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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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