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Shell Programming and Scripting

Substitute grep command at run time

 
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Old 09-04-2018
Substitute grep command at run time
HI
I am trying to use the following code in the shell script (using grep)

Code:
usage()
{
  echo "Usage: ./$0 <file name> <interval> <pattern>"
} 

METRICS_FILE=$1
INTERVAL=$2
PATTERN="$3" 
..

if [ "${PATTERN}" == "" ]
then
 PATTERN="grep Gx"
fi

	COUNT=`cat ${METRICS_FILE} | "${PATTERN}" |egrep "${start_tim}|${end_tim}" |awk -F"Count=" '{print $2}'|cut -d',' -f1 |perl -lne '$sum += $_ } { print $sum'`

..

The above is working fine in case I do not provide any argument for arg no 3, as in that case the hard-coded string "PATTERN="grep Gx"", is used.

But in case i provide argument 3 as "grep gx|grep -v RAR"

I am getting error.:
Quote:
./rate.sh metrics.csv.20180730_13_00 15 "grep gx|grep -v RAR"
./rate.sh: line 31: grep gx|grep -v RAR: command not found
Please suggest.
 
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LEARN ABOUT REDHAT

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  is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep.  If no file is speci-
       fied, 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  zgrep  is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, zgrep uses
       it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	zgrep string files
	   for csh: (setenv GREP fgrep; zgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1)

																	  ZGREP(1)