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a simple csh script

Asked by guochu in Scripting Languages, csh / tcsh, Shell Scripting

I am looking for an example of csh script to test the input is a positive integer. Any input can help!!! Thanks!

My one didn't work
--------------------------
echo -n "Please enter a positive integer "
set input=$<
if ($input contains '-' || $input contains '.') then
    echo "wrong input"
else
   echo "input accepted"
endif
---------------------------
my problem is that I don't know how to grep the $input whether or not has a symbol minus sign i.e. '-' or decimal sign i.e. '.'
[+][-]09/29/08 12:09 PM, ID: 22599543Expert Comment

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[+][-]09/29/08 12:48 PM, ID: 22599959Author Comment

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[+][-]09/29/08 01:41 PM, ID: 22600460Expert Comment

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[+][-]09/29/08 02:26 PM, ID: 22600874Author Comment

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[+][-]09/29/08 06:27 PM, ID: 22602119Author Comment

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[+][-]09/29/08 06:32 PM, ID: 22602137Expert Comment

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