$ curl cheat.sh/
# nice
# Execute a program with a custom scheduling priority (niceness).
# Niceness values range from -20 (the highest priority) to 19 (the lowest).
# More information: <https://www.gnu.org/software/coreutils/nice>.

# Launch a program with altered priority:
nice -n niceness_value command

$
Follow @igor_chubin cheat.sh tldr