1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)time.1 8.1 (Berkeley) 6/6/93 33.\" 34.Dd June 6, 1993 35.Dt TIME 1 36.Os BSD 4 37.Sh NAME 38.Nm time 39.Nd time command execution 40.Sh SYNOPSIS 41.Nm time 42.Op Fl l 43.Ar command 44.Sh DESCRIPTION 45The 46.Nm time 47utility 48executes and 49times 50.Ar command 51by initiating a timer and passing the 52.Ar command 53to the 54shell. 55After the 56.Ar command 57finishes, 58.Nm time 59writes to the standard error stream, 60(in seconds): 61the total time elapsed, 62time consumed by system overhead, 63and the time used to execute the 64.Ar command 65process. 66.Pp 67Available options: 68.Bl -tag -width Ds 69.It Fl l 70The contents of the 71.Em rusage 72structure are printed as well. 73.El 74.Pp 75The 76.Xr csh 1 77has its own and syntactically different builtin version of 78.Nm time. 79The command described here 80is available as 81.Pa /usr/bin/time 82to 83.Xr csh 84users. 85.Sh BUGS 86The granularity of seconds on micro processors is crude and 87can result in times being reported for CPU usage which are too large by 88a second. 89.Sh SEE ALSO 90.Xr csh 1 91.Sh FILES 92.Bl -tag -width /usr/include/sys/resource.h -compact 93.It Pa /usr/include/sys/resource.h 94.El 95.Sh HISTORY 96A 97.Nm 98command appeared in 99.At v6 . 100