Slightly Off Topic - value of variable in unix mail

Hello.

I am trying to enhance a shell script in bash shell on HP UX. I need your help, please. I need the script to mail me if the value of a variable is more than certain number. How can I do this? $free is the variable

If $free > 500
mailx -s "Value of free is :" the _value_of_free shivaswamykr_at_abc.com fi

is what I want to do .

Can you tell me how I can do this.

Thanks for your help,
Shiva

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