How can I perform size check of any character file(which switch)?
For example: I have to perform certain actions if file size is not zero. How can I do that?

Is this syntax fine?

if test ! -z $filename
then

fi

-z $filename checks whether the string contained in the variable $filename is of length zero or not.

If you understand string functions in c/c++, -z $filename is the same is as the function if (strlen(filename) == 0)

To check whether the file has a size greater than 0, use the construct

[ -s "$filename" ]

Thanks for your help vino.

malay