Linux nice command
On Unix-like operating systems, the nice command runs a command with a modified scheduling priority.
nice runs command COMMAND with an adjusted "niceness", which affects process scheduling. A process with a lower niceness value is given higher priority and more CPU time. A process with a higher niceness value (a "nicer" process) is given a lower priority and less CPU time, freeing up resources for processes that are more demanding.
Niceness values range from -20 (most favorable to the process) to 19 (least favorable to the process).
With no COMMAND, nice prints the current niceness level.
nice [OPTION] [COMMAND [ARG]...]
|Add integer N to the niceness (default is 10).
|Display a help message and exit.
|Output version information and exit.
Displays the default niceness level of new processes; this is commonly zero, so the output would probably look like this:
nice -n13 pico myfile.txt
Runs the pico command on myfile.txt with a niceness increment of 13. Since we already saw the default niceness level was zero, this runs pico with a niceness level of zero plus 13, which is 13. As a result, pico can use CPU resources with a higher priority than any process running with a niceness level greater than 14, but has a lower priority than processes with a value less than 14.
Effectively, this tells the system to treat pico as a low-priority process, but not the lowest.
csh — The C shell command interpreter.
ksh — The Korn shell command interpreter.
nohup — Instruct a command to continue running even if the session is disconnected or the user logs out.
priocntl — Display or set scheduling parameters of a processes under Solaris.
sh — The Bourne shell command interpreter.