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What you're doing is just testing if the file exists or not. What I want to test, is that the file exists and has file size larger than 0, which is done by using the switch -s in borne shell.

How...

Just want to know a few conversion tricks.

in Borne Shell, I have the line:

if test -s testmap
then
...
fi
## testmap is a filename and I wanna test whether it exists
## then do whatever...