command (with its
arguments) with lower priority (i.e., be "nice" to other users). With no arguments, nice prints the default scheduling priority (niceness). If nice is a child process, it prints the parent process's scheduling priority. Niceness has a range of -20 (highest priority) to 20 (lowest priority).
adjustment, -adjustment, --adjustment=
command with niceness incremented by
adjustment (1 to 20); default is 10. A privileged user can raise priority by specifying a negative
adjustment (e.g., -5).