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2003/12/28 watch

Some material is very old and may be incorrect today

© December 2003 Tony Lawrence

(Linux) Runs some other command at regular intervals and shows you the result. Useful for when you are constantly checking on something like diskpace, the size of a file, some network connection: whatever, it really doesn't matter. Just run "watch" with your command , enclosing it in quotes if you are using pipes:

watch 'ps aux | grep myprocess'

The default is to run your command every two seconds, which is usually way too soon. There's a handy -d flag that highlights differences from the last run. You may want to add -c to that if your really need to notice a change whether or not you happened to be looking when it happened.

Finally, "watch" only displays the first screenful of output.

# watch logins every 10 seconds, marking changes cumulatively
watch -n 10 -dc w

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Inexpensive and informative Apple related e-books:

Take Control of IOS 11

Sierra: A Take Control Crash Course

Take Control of Upgrading to El Capitan

iOS 10: A Take Control Crash Course

Take Control of Apple Mail, Third Edition

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