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anbu23, shell_life, thanks so much for your quick responses. You've really helped and it is very much appreciated.

Tom

thank you for your response shell_life.

I modified the test script to this and it worked under sh shell
#!/bin/sh
echo "enter a number:"
read num
echo "you entered $num"
num=`expr $num + 1`...

I've searched the forum and google, but can't see an answer to this simple problem. Here's my small test script:

#!/bin/csh
echo "enter a number:"
read num
echo "you entered $num"
set num =...