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