storing variable value

[Daniel Dalton]

Hi!

I'm writing a program to provide me with battery warnings when my
battery hits certain levels. It just checks the current level and does
something. I plan to call it from a a cron job. But If the cron runs
every minute, warnings every minute would be rather annoying. so is
there a way to make the script check if it has already ran before?
eg. can I write to a variable on one run of the program, and on the next
read that value that was written?

Thx!

Daniel.

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