Occasionally I forget to use the nicecommand. Linux is kind enough to allow us to change the nice level of a process that’s already running, by using the snice command. It’s very easy to use and much quicker than stopping and restarting the process.
Let’s say I have mpeg2enc encoding a video, and after 10 minutes, I realize I forgot the nice command. It’s going to take another hour or two, but I don’t want to waste the 10 minutes I’ve already spent working on the video. No fear!
The command below will save me:
sudo snice -5 mpeg2enc
You’ll notice that I prefixed the line with the sudo command. snice requires sudo privilege for a nice level of anything below zero.
Stumble it! 
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