V8/usr/man/man1/time.1

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.TH TIME 1 
.SH NAME
time \- time a command
.SH SYNOPSIS
.B time
[
.B \-usrtdmfio
] [
.B \-v
]
command
.SH DESCRIPTION
The
given command is executed; after it is complete,
.I time
reports statistics about the program on its standard error output.
The statistics printed are controlled by the options;
the default is
.B \-usr
and
.B \-v
reports everything.  The statistics are:
.TP
.B u
User cpu time consumed by the command
.TP
.B s
System cpu time attributed to the command
.TP
.B r
Real (clock) time taken by the command
.TP
.B t
Average resident text size, in Kb.
.TP
.B d
Average resident data size, in Kb.
.TP
.B m
Maximum total resident size, in Kb.
.TP
.B f
Number of page faults resulting in disk i/o.
.TP
.B i
Number of disk blocks read.
.TP
.B o
Number of disk blocks written.
.PP
After the statistics,
.I time
prints a tab and the command, up to the fifth argument.
Times are reported in seconds.
.SH BUGS
Elapsed time is accurate to the second,
while the CPU times are measured
to the 60th second.
Thus the sum of the CPU times can be up to a second larger
than the elapsed time.