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Full Discussion: Problem with awk syntax
Top Forums Shell Programming and Scripting Problem with awk syntax Post 302523146 by sudvishw on Wednesday 18th of May 2011 05:04:52 AM
Old 05-18-2011
Thank you
Thanks a lot for all your explanations and efforts. As you had rightly pointed out, I need not grep for blank lines having specified the field separator as '+'. Also, I missed to escape the metacharacter. This cleaned up code works fine:
Code:
cat num | awk -F"+" '
{if ( $0 ~ /^[0-9+-]+$/ )
      {
         if ( $0 ~ /\+/ )
         {print $0}
      }
   }'

 

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LEARN ABOUT PLAN9

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  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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