replace spaces in filenames in bulk
Dealing with spaces on the commandline in linux is a pain. This commandline will strip spaces and replace with underscores:
for f in *\ *; do mv "$f" "${f// /_}"; done 2>/dev/null
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.