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Echo not displaying variable in If-Else condition

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# 1  
Old 02-22-2013
Echo not displaying variable in If-Else condition
Code:
 
if [ "${x_oug}" -ne 0 ]
then
echo "Entry Valid                  :  ${x_oug}"
else
echo "Entry Invalid                  : " 0
fi

In the above code the 3rd line is not working... it does not print anything

I tried following as well .. but no luck!

Code:
echo "Entry Valid                   :   ${x_oug}"
echo "Entry Valid                   :   " ${x_oug}
echo "Entry Valid                   :   $x_oug
echo "Entry Valid                   : " "${x_oug}"

However, if I put a constant like following it works correctly

Code:
echo "Entry valid                  : 5 "

In fact I am forced to use if else as echo not prinitng the variable when it has 0 value

Please help me on this

Thanks and Regards
Chetanz
# 2  
Old 02-22-2013
How are you setting x_oug?
# 3  
Old 02-22-2013
What's the value of x_oug? How do you assign it? Did you run the script with the xtrace option set?
# 4  
Old 02-22-2013
Thanks for quick replies

I am retriving it from a file which is in fact output of vmstat... eliminating header, awking a particular column values and then getting max of that to set x_oug
Code:
x_oug=`cat /u01/zopepx/vmstat1.txt|grep -v kthr|grep -v '-'|grep -v r|awk '{print x7}'|grep -Ev '(#.*$)|(^$)'|grep -v System|awk '{if($1>mx)mx=$1;}END{print mx}'`

Regards
Chetanz
# 5  
Old 02-22-2013
You know you can make THAT statement way more legible and efficient?

Pls post output of echo "$x_oug"
# 6  
Old 02-22-2013
Hello

Output remains as following i.d. NULL

Code:
Entry valid                  :

Regards
Chetanz
# 7  
Old 02-22-2013
Quote:
Originally Posted by Chetanz
Thanks for quick replies

I am retriving it from a file which is in fact output of vmstat... eliminating header, awking a particular column values and then getting max of that to set x_oug
Code:
x_oug=`cat /u01/zopepx/vmstat1.txt|grep -v kthr|grep -v '-'|grep -v r|awk '{print x7}'|grep -Ev '(#.*$)|(^$)'|grep -v System|awk '{if($1>mx)mx=$1;}END{print mx}'`

Regards
Chetanz
I have no idea what you thought you should get out of this, but the awk in the middle of this pipeline (awk '{print x7}') prints an empty line for every line it reads. The two greps that follow that are no-ops, and the awk after that converts one or more empty lines into a single empty line. The ksh test -eq operator is intended to compare two numeric values. Since an empty string is not a numeric value, I'm not sure the results of the comparison are defined, but I expect that ksh will say that [ "" -eq 0 ] evaluates to false rather than giving a syntax error.
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