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Full Discussion: Use of -r, grep, nawk in script
Top Forums Shell Programming and Scripting Use of -r, grep, nawk in script Post 302891522 by DK2014 on Thursday 6th of March 2014 09:02:27 AM
Old 03-06-2014
Use of -r, grep, nawk in script
Hello Friends,

I am new to unix shell, need to understand the meaning of few cmds in below script,

Code:
#!/usr/bin/ksh
FTP_FILE_NAME="$1"

if [ -r $FTP_FILE_NAME ]
then
  grep "TRLR@@@@@@" $FTP_FILE_NAME | nawk -F"[|]" '{print $2}'
else
  echo "0"
fi

what is the use of -r, grep, nawk & -F in above script. Why grep is followed by "TRLR@@@@".

Thx for your time.
Last edited by Franklin52; 03-06-2014 at 10:04 AM.. Reason: Please use code tags
 

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LEARN ABOUT XFREE86

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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