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Full Discussion: Usage of grep '^$1' filename
Top Forums UNIX for Dummies Questions & Answers Usage of grep '^$1' filename Post 302952576 by okkadu on Thursday 20th of August 2015 01:22:15 AM
Old 08-20-2015
Usage of grep '^$1' filename

There is a file name list_filenames.dat, this has all the list of all files I need to encrypt, I did not understand what the following syntax is doing:

Code:
grep -s "^$1" list_filenames.dat

, when I manually run this command it just returns all the lines, what is the usage of this ? can someone explain?

Last edited by Don Cragun; 08-20-2015 at 03:55 AM.. Reason: Add CODE and ICODE tags.
 

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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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