NICE(1) User Commands NICE(1)


NAME


nice - invoke a command with an altered scheduling priority

SYNOPSIS


/usr/bin/nice [-increment | -n increment] command
[argument]...


/usr/xpg4/bin/nice [-increment | -n increment] command
[argument]...


csh Builtin
nice [-increment | +increment] [command]


DESCRIPTION


The nice utility invokes command, requesting that it be run with a
different system scheduling priority. The priocntl(1) command is a more
general interface to scheduler functions.


The invoking process (generally the user's shell) must be in a scheduling
class that supports nice.


If the C shell (see csh(1)) is used, the full path of the command must be
specified. Otherwise, the csh built-in version of nice will be invoked.
See csh Builtin below.


If nice executes commands with arguments, it uses the default shell
/usr/bin/sh (see sh(1)).

csh Builtin
nice is also a csh built-in command with behavior different from the
utility versions. See csh(1) for description.

OPTIONS


The following options are supported:

-increment | -n increment
increment is a positive or negative decimal
integer that has the same effect on the
execution of the utility as if the utility
had called the nice() function with the
numeric value of the increment option-
argument. See nice(2). nice() errors, other
than EINVAL, are ignored. If not specified,
an increment of 10 is assumed.

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.


OPERANDS


The following operands are supported:

command
The name of a command that is to be invoked. If command names
any of the special built-in utilities (see
shell_builtins(1)), the results are undefined.


argument
Any string to be supplied as an argument when invoking
command.


ENVIRONMENT VARIABLES


See environ(5) for descriptions of the following environment variables
that affect the execution of nice: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES,
PATH, and NLSPATH.

EXIT STATUS


If command is invoked, the exit status of nice will be the exit status of
command. Otherwise, nice will exit with one of the following values:

1-125
An error occurred.


126
command was found but could not be invoked.


127
command could not be found.


ATTRIBUTES


See attributes(5) for descriptions of the following attributes:

/usr/bin/nice

+---------------+-----------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------+
|CSI | Enabled |
+---------------+-----------------+

/usr/xpg4/bin/nice

+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|CSI | Enabled |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+

SEE ALSO


csh(1), ksh(1), nohup(1), priocntl(1), sh(1), shell_builtins(1), nice(2),
attributes(5), environ(5), standards(5)


January 23, 2004 NICE(1)