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 42.Op Fl al 43.Op Fl o Ar file 44.Ar command 45.Sh DESCRIPTION 46The 47.Nm 48utility 49executes and 50times 51.Ar command 52by initiating a timer and passing the 53.Ar command 54to the 55shell. 56After the 57.Ar command 58finishes, 59.Nm 60writes to the standard error stream, 61(in seconds): 62the total time elapsed, 63time consumed by system overhead, 64and the time used to execute the 65.Ar command 66process. 67.Pp 68Available options: 69.Bl -tag -width Ds 70.It Fl a 71If the 72.Fl o 73flag is used, append to the specified file rather than overwriting 74it. Otherwise, this option has no effect. 75.It Fl l 76The contents of the 77.Em rusage 78structure are printed as well. 79.It Fl o Ar file 80Write the output to 81.Ar file 82instead of stderr. If 83.Ar file 84exists and the 85.Fl a 86flag is not specified, the file will be overwritten. 87.El 88.Pp 89The 90.Xr csh 1 91has its own and syntactically different builtin version of 92.Nm time . 93The command described here 94is available as 95.Pa /usr/bin/time 96to 97.Xr csh 98users. 99.Sh SEE ALSO 100.Xr csh 1 , 101.Xr getrusage 2 , 102.Xr wait 2 103.Sh HISTORY 104A 105.Nm 106command appeared in 107.At v6 . 108