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Use of -r, grep, nawk in script

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# 1  
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
# 2  
Old 03-06-2014
You could easily answer these question by doing some basic research. Namely into the man pages:
test
grep
nawk

"TRLR@@@@" is the search term. If you don't understand it, ask the person who wrote it.
# 3  
Old 03-06-2014
-r is a test for file existence (see man test)
if the file exists then grep is looking for "TRLR@@@@@@" in the file (see man grep)
and if it finds the string awk uses the "|" as a field separator to print the second field (see man awk)

Maybe you should try a little reading or research before just asking.
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