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Full Discussion: Unable to grep using wildcard in a file.
Top Forums Shell Programming and Scripting Unable to grep using wildcard in a file. Post 303041850 by mohtashims on Thursday 5th of December 2019 08:14:35 AM
Old 12-05-2019
Unable to grep using wildcard in a file.
I wish to check if my file has a line that does not start with '#' and has
1. Listen and 2. 443

Code:
 echo "Listen               443" > test.out

grep 'Listen *443' test.out | grep -v '#'
Listen               443

The above worked fine but when the entry changes to the below the grep fails when i dont want it to fail.

Code:
echo "Listen     192.888.22.111:443" > test.out

Also, i do grep -v '#' to ignore lines having # i.e comments but is there a way to check if # is the starting (not necessary the first character considering there are whitespaces before the #) charecter in the line only then it should be ignored else be considered by the grep query.

So....

Quote:
# Listen 192.888.22.111:443
should not be considered

But

Quote:
Listen 192.888.22.111:443 #
should be considered.
 

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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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