Pause a program which is using too much CPU

Sometimes your battery is running low and you need to pause a program without quitting it or force-quitting it, so that you can preserve battery but not lose the job that the program is doing. To do this, 

Step 1. open a terminal

Step 2. type: 

ps ax | grep -i "<program name>"

so for example, if it's photoshop you need to pause, replace "<program name>" with "photoshop"

Step 3. Next to the results on the far left you'll see a number, usually with 5 digits. E.g. 12345.

Step 4. Type: 

kill -STOP 12345

where 12345 are the numbers obtained in Step 2-3.

Step 5. When you want to resume the program, type

kill -CONT 12345

It should then continue to operate or run as usual without problems.

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