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If Condition Issue in UNIX

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# 8  
Old 08-08-2013
Hi Rbatte1

Thanks for your suggestions, Chnaged my shell script to reflect as per your code, worked fine, Thank you once again

I am a newbie in SHELL, so learning a lot from unix gurus like you
# 9  
Old 08-08-2013
We were all new to it once, and we're all still learning now.

Welcome aboard. Smilie



Robin
# 10  
Old 08-08-2013
You can test also empty string without X extension - this example is cut&pasted worldwide, but sh shells don't need it. You can test simple
Code:
if [ "$FILE_SIZE" = "" ] ; then # value is empty
     do_some
fi
# or not empty testing
if [ "$FILE_SIZE" != "" ] ; then # value is not empty
     do_some
fi

# you can write previous line very shortly, but I like myself prev version = more readable, self documentation.
if [  !  "$FILE_SIZE"  ] ; then # variable is empty
     do_some
fi
# or not empty testing
if [  "$FILE_SIZE"  ] ; then # value is not empty
     do_some
fi

In shell script you can use old test command [ and also newer [[.
They are different test cmds. Almost same but not.
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