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Top Forums UNIX for Dummies Questions & Answers Egrep confusion with "I" and "-I" pattern Post 302834373 by Don Cragun on Thursday 18th of July 2013 08:07:16 PM
Old 07-18-2013
The -w option to grep is not specified by the standards. Some implementations of grep, egrep, and fgrep do not accept a -w option and those that do may have different ideas of what it means. A common interpretation of -w is that the given regular expression is matched if it matches a "word" where a word consists of alphanumeric and underscore characters. Since the minus sign is not in this set, the I in -I 07-18 is a match for the word I. To get the exact meaning on your OS, look at the description of the -w option on the grep(1) man page on your system.
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BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME
bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression SYNOPSIS
bzgrep [ grep_options ] [ -e ] pattern filename... bzegrep [ egrep_options ] [ -e ] pattern filename... bzfgrep [ fgrep_options ] [ -e ] pattern filename... DESCRIPTION
Bzgrep is used to invoke the grep on bzip2-compressed files. All 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 bzgrep is invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, bzgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep bzgrep string files for csh: (setenv GREP fgrep; bzgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux. SEE ALSO
grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1) BZGREP(1)
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