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Full Discussion: Handling null Integer/string variables
Top Forums Shell Programming and Scripting Handling null Integer/string variables Post 302604749 by lan123 on Monday 5th of March 2012 11:38:25 PM
Old 03-06-2012
Hi guys, thanks a lot for so many replies....

It was good solution to use
Code:
ps -ef | grep "[m]intty" | awk '{print $2}'

This works and gives only one PID. The actual problem I found out was that, the variable never gets a value assigned. The PID value getting printed was from the following step.
Code:
LAN_VARIABLE= echo `ps -ef | grep "[m]intty" | awk '{print $2}'`

echo $LAN_VARIABLE always returned null, hence the if loop had the ambiguity.


I used the following and it worked.
Code:
if [-z `ps -ef | grep [m]intty | awk '{print $2}'`]; then
echo "not an Integer"
else
echo "An Integer"
fi

Last edited by Franklin52; 03-06-2012 at 03:09 AM.. Reason: Please use code tags for code and data samples, thank you
 

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LEARN ABOUT MINIX

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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