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Full Discussion: How to use $variable in grep?
Top Forums UNIX for Beginners Questions & Answers How to use $variable in grep? Post 302998358 by scriptor on Wednesday 31st of May 2017 03:06:36 AM
Old 05-31-2017
How to use $variable in grep?
hi
i have a file which contains some messages counters.
below is the snippet on the file.
Code:
 
 17-05-29::22:36:21|message|231
17-05-29::22:36:31|message|222
17-05-29::22:36:41|message|213
17-05-30::22:36:51|message|221
17-05-30::22:37:01|message|227
17-05-30::22:37:11|message|207
17-05-31::22:37:21|message|219
17-05-31::22:37:31|message|224
17-05-31::22:37:41|message|235

here first i want to grep the data with date and the same i have scripted.
Code:
 
 #!/bin/bash
 cd /var/tmp
DT1=`date --d "1 days ago" +%Y"_"%m"_"%d`
cat v1.txt | grep -i "$DT1" >a.txt

if i do
Code:
cat v1.txt |grep -i "17-05-30" | head  
it show output as below 
17-05-30::22:36:51|message|221
17-05-30::22:37:01|message|227
17-05-30::22:37:11|message|207

i tried
Code:
cat v1.txt |grep -i "^$DT1"

but this also not works.

i not able to figure it out where i am doing mistake.

scriptor
 

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LEARN ABOUT LINUX

zegrep

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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