The watch Linux command line tool
I’m sure everyone else already knows about watch, but it’s new to me. This little utility executes a program repeatedly at a set interval and displays its output.
I’ve been using it with mysqladmin‘s processlist command like this:
watch -n 1 /usr/bin/mysqladmin -uroot -pMYPASSWORD processlist
Note that this does put your password on display at the top of the command window whilst watch is running. If you don’t want that, you could write a little bash script instead like this one from a friend of mine:
mysqladmin -uroot -pMYPASSWORD processlist
Either way, we get a display of the MySQL process list every second in a Terminal window and it becomes very easy to see which processes are causing trouble.