BSD 4_3_Net_2 release

[unix-history] / usr / src / usr.bin / time / time.1

diff --git a/usr/src/usr.bin/time/time.1 b/usr/src/usr.bin/time/time.1
index a9c0ac8..6500425 100644 (file)
--- a/usr/src/usr.bin/time/time.1
+++ b/usr/src/usr.bin/time/time.1
@@ -1,34 +1,99 @@
-.\" Copyright (c) 1980 Regents of the University of California.
-.\" All rights reserved.  The Berkeley software License Agreement
-.\" specifies the terms and conditions for redistribution.
+.\" Copyright (c) 1980, 1991 Regents of the University of California.
+.\" All rights reserved.

 .\"
 .\"

-.\"    @(#)time.1      6.2 (Berkeley) %G%
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"    This product includes software developed by the University of
+.\"    California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.

 .\"
 .\"

-.TH TIME 1 ""
-.UC 4
-.SH NAME
-time \- time a command
-.SH SYNOPSIS
-.B time
-[-l] command
-.SH DESCRIPTION
-The given command is executed; after it is complete, \fItime\fP
-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.  If the \fB-l\fP option is supplied, the
-contents of the \fIrusage\fP structure are printed as well.
-.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, ``stderr''.
-.PP
-\fITime\fP is a built-in command to \fIcsh\fP(1), with a much different
-syntax.  This command is available as ``/bin/time'' to \fIcsh\fP users.
-.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.
-.SH "SEE ALSO"
-include/sys/h/resource.h
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)time.1     6.4 (Berkeley) 4/23/91
+.\"
+.Dd April 23, 1991
+.Dt TIME 1
+.Os BSD 4
+.Sh NAME
+.Nm time
+.Nd time command execution
+.Sh SYNOPSIS
+.Nm time
+.Op Fl l
+.Ar command
+.Sh DESCRIPTION
+The
+.Nm time
+utility
+executes and
+times
+.Ar command
+by initiating a timer and passing the
+.Ar command
+to the
+shell.
+After the
+.Ar command
+finishes,
+.Nm time
+writes to the standard error stream,
+(in seconds): 
+the total time elapsed,
+time consumed by system overhead,
+and the time used to execute the
+.Ar command
+process.
+.Pp
+Available options:
+.Bl -tag -width Ds
+.It Fl l
+The contents of the
+.Em rusage
+structure are printed as well.
+.El
+.Pp
+The
+.Xr csh 1
+has its own and syntactically different builtin version of
+.Nm time.
+The command described here
+is available as
+.Pa /bin/time
+to
+.Xr csh
+users.
+.Sh BUGS
+The granularity of seconds on micro processors is crude and
+can result in times being reported for CPU usage which are too large by
+a second.
+.Sh SEE ALSO
+.Xr csh 1
+.Sh FILES
+.Bl -tag -width /usr/include/sys/h/resource.h -compact
+.It Pa /usr/include/sys/h/resource.h
+.El
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v6 .