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30 .\" @(#)time.1 8.1 (Berkeley) 6/6/93
37 .Nd time command execution
54 writes the total time elapsed,
55 the time consumed by system overhead,
56 and the time used to execute
58 to the standard error stream.
59 Times are reported in seconds.
68 Lists resource utilization information.
73 structure are printed, see below.
75 The output is formatted as specified by
83 have their own and syntactically different builtin version of
85 The utility described here
88 to users of these shells.
89 .Ss Resource Utilization
92 option is given, the following resource usage
93 informations are displayed
94 in addition to the timing information:
95 .Bl -item -offset indent -compact
97 maximum resident set size
99 average shared memory size
101 average unshared data size
103 average unshared stack size
111 block input operations
113 block output operations
121 voluntary context switches
123 involuntary context switches
128 utility exits with one of the following values:
129 .Bl -tag -width indent
131 An error occurred in the
137 was found but could not be invoked.
144 Otherwise, the exit status of
149 .Bl -tag -width \*[Lt]sys/resource.h\*[Gt] -compact
150 .It \*[Lt]sys/resource.h\*[Gt]
162 The granularity of seconds on microprocessors is crude and
163 can result in times being reported for CPU usage which are too large by