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Full Discussion: Usage of grep '^$1' filename
Top Forums UNIX for Dummies Questions & Answers Usage of grep '^$1' filename Post 302952648 by Don Cragun on Thursday 20th of August 2015 02:24:26 PM
Old 08-20-2015
Quote:
Originally Posted by RudiC
$1 in shell is the first positional parameter, either supplied when calling the script or function, or (in bash) set by set -- text1 text2 . . ..
Code:
set -- arg...

isn't just available in bash; it is required in all POSIX-conforming shells.

Note that the -- is only required if the 1st arg starts with a - or + character or if you want to use the command:
Code:
set --

to unset all positional parameters.
 

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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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