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Full Discussion: Simple newbie grep question
Top Forums UNIX for Dummies Questions & Answers Simple newbie grep question Post 302182206 by era on Sunday 6th of April 2008 12:58:27 AM
Old 04-06-2008
Read up on regular expressions. The egrep manual page has a very brief summary; some systems also have a regex(5) manual page which is a bit more detailed. Any good Unix beginners book will have a chapter or five on the subject.

There's absolutely no math in there but it's a very powerful and versatile facility for matching ... stuff.

Code:
egrep '1st|2nd|3rd|[4-9]th' chatlog.txt

Note that this will also match '21st', '103245th', etc. The grep family of tools are strictly substring-based and line-oriented; any line containing a match anywhere in it will be printed.
 

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LEARN ABOUT POSIX

zgrep

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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