TIME(1) | General Commands Manual | TIME(1) |
time
— time
command execution
time |
[-clpt ] [-f
fmt] command
[argument ...] |
The time
utility executes and times
command. After the command finishes,
time
writes the total elapsed time (wall clock
time), (“real”), the CPU time spent executing
command at user level (“user”), and the
CPU time spent executing in the operating system kernel
(“sys”), to the standard error stream. Times are reported in
seconds.
Available options:
-c
time
builtin of
csh(1) uses (%Uu %Ss %E %P
%X+%Dk %I+%Oio %Fpf+%Ww).-f
time
builtin syntax. The following sequences may
be used in the format string:
-l
-p
-t
time
builtin of
tcsh(1) uses (%Uu %Ss %E
%P\t%X+%Dk %I+%Oio %Fpf+%Ww) with three decimal places for time
values.Some shells, such as
csh(1) and
ksh(1), have their own and
syntactically different built-in version of time
.
The utility described here is available as
/usr/bin/time to users of these shells.
If the -l
option is given, the following
resource usage information is displayed in addition to the timing
information:
The time
utility exits with one of the
following values:
time
utility.Otherwise, the exit status of time
will be
that of command.
The time
utility conforms to
IEEE Std 1003.2-1992 (“POSIX.2”).
The granularity of seconds on microprocessors is crude and can result in times being reported for CPU usage which are too large by a second.
April 5, 2021 | NetBSD 10.99 |