Problem with expr
 

Hi All,
I want to subtract two variables in shellscript. This is what I did:
echo "`expr ${var1} - ${var2}`"
But it throws error saying:
expr: syntax error

Anyone pls tell me the correct syntax for expr.

Hi...

Welcome to the forum :)

Just as a suggestion, you might want to contact Jeremy to change your username. Using your e-mail address will most likely result in your inbox being filled with SPAM very soon. ;)

Regards...

Need to change the userid
 

Hi,
I'm not able to find any option to change the user id in Edit Profile link.. Can u help me pls

Hi...

There is none. As I mentioned, you will need to contact Jeremy, the forum's owner, to have this changed. ;)

Regards...

First, read the LQ Rules about text-speak, and about not using it. Spell out your words.

Secondly, there are THOUSANDS of easily-found bash scripting guides that cover this...read the "Question Guidelines" link in my posting signature, and do basic research first, before posting a question. Since you know it's a syntax error, that means that you also know what to look up. An example:
...from one of the 117,000 hits for "bash script to subtract two variables". Note those are back-ticks, not single-quotes.