[unix-history] / usr / man / man1 / time.1

.TH TIME 1  "18 January 1983"
.UC 4
.SH NAME
time \- time a command
.SH SYNOPSIS
.B time
command
.SH DESCRIPTION
The
given command is executed; after it is complete,
.I time
prints the elapsed time during the command, the time
spent in the system, and the time spent in execution
of the command.
Times are reported in seconds.
.PP
On a PDP-11, the execution time can depend on what kind of memory
the program happens to land in;
the user time in MOS is often half what it is in core.
.PP
The times are printed on the diagnostic output stream.
.PP
.I Time
is built in to
.IR csh (1),
using a different output format.
.SH BUGS
Elapsed time is accurate to the second,
while the CPU times are measured
to the 100th second.
Thus the sum of the CPU times can be up to a second larger
than the elapsed time.
.PP
.I Time
is a built-in command to
.IR csh (1),
with a much different syntax.  This command is available as
``/bin/time'' to
.I csh
users.
Commit	Line	Data
6601abfb C	1	.TH TIME 1 "18 January 1983"
	2	.UC 4
	3	.SH NAME
	4	time \- time a command
	5	.SH SYNOPSIS
	6	.B time
	7	command
	8	.SH DESCRIPTION
	9	The
	10	given command is executed; after it is complete,
	11	.I time
	12	prints the elapsed time during the command, the time
	13	spent in the system, and the time spent in execution
	14	of the command.
	15	Times are reported in seconds.
	16	.PP
	17	On a PDP-11, the execution time can depend on what kind of memory
	18	the program happens to land in;
	19	the user time in MOS is often half what it is in core.
	20	.PP
	21	The times are printed on the diagnostic output stream.
	22	.PP
	23	.I Time
	24	is built in to
	25	.IR csh (1),
	26	using a different output format.
	27	.SH BUGS
	28	Elapsed time is accurate to the second,
	29	while the CPU times are measured
	30	to the 100th second.
	31	Thus the sum of the CPU times can be up to a second larger
	32	than the elapsed time.
	33	.PP
	34	.I Time
	35	is a built-in command to
	36	.IR csh (1),
	37	with a much different syntax. This command is available as
	38	``/bin/time'' to
	39	.I csh
	40	users.