Linux and Unix nice command
Invokes a command with an altered scheduling priority.
nice [-increment | -n increment ] command [argument ... ]
|-increment | -n increment||increment must be in the range 1-19; if not specified, an increment of 10 is assumed. An increment greater than 19 is equivalent to 19.
The super-user may run commands with priority higher than normal by using a negative increment such as -10. A negative increment assigned by an unprivileged user is ignored.
|command||The name of a command that is to be invoked. If command names any of the special built-in utilities, the results are undefined.|
|argument||Any string to be supplied as an argument when invoking command.|
nice +13 pico myfile.txt
Runs the pico command on myfile.txt with an increment of +13.