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Top Forums Shell Programming and Scripting searching a log file and appending to a .txt file Post 302331625 by enator45 on Monday 6th of July 2009 05:56:05 PM
Old 07-06-2009
yes, this I've been able to figure out. Though, I don't quite understand the need to use cat in your moderate example.

After googling for a while, I figured I could pull out just the string using grep -o pattern filename, but it doesn't work for me. Next I tried to just pull out the substring I need using the below, but that isn't working for me either...

freeMem=`grep ",.*free mem," testlog.txt`
echo ${freeMem:22:2} ## get an error that says bad substitution.
 

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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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