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time(1) [bsd man page]

TIME(1) 						      General Commands Manual							   TIME(1)

NAME
time - time a command SYNOPSIS
time command DESCRIPTION
The given command is executed; after it is complete, time 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. 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. The times are printed on the diagnostic output stream. Time is built in to csh(1), using a different output format. 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. Time is a built-in command to csh(1), with a much different syntax. This command is available as ``/bin/time'' to csh users. 4th Berkeley Distribution April 29, 1985 TIME(1)

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TIME(1) 						    BSD General Commands Manual 						   TIME(1)

NAME
time -- time command execution SYNOPSIS
time [-clp] command [argument ...] DESCRIPTION
The time utility executes and times command. After the command finishes, time writes the total elapsed time (wall clock time), (``real''), the CPU time spent executing command at user level (``user''), and the CPU time spent executing in the operating system kernel (``sys''), to the standard error stream. Times are reported in seconds. Available options: -c Displays information in the format used by the time builtin of csh(1). -l Lists resource utilization information. The contents of the command process's rusage structure are printed; see below. -p The output is formatted as specified by IEEE Std 1003.2-1992 (``POSIX.2''). Some shells, such as csh(1) and ksh(1), have their own and syntactically different built-in version of time. The utility described here is available as /usr/bin/time to users of these shells. Resource Utilization If the -l option is given, the following resource usage information is displayed in addition to the timing information: maximum resident set size average shared memory size average unshared data size average unshared stack size page reclaims page faults swaps block input operations block output operations messages sent messages received signals received voluntary context switches involuntary context switches Resource usage is the total for the execution of command and any child processes it spawns, as per wait4(2). FILES
<sys/resource.h> EXIT STATUS
The time utility exits with one of the following values: 1-125 An error occurred in the time utility. 126 The command was found but could not be invoked. 127 The command could not be found. Otherwise, the exit status of time will be that of command. SEE ALSO
csh(1), ksh(1), clock_gettime(2), getrusage(2) STANDARDS
The time utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). BUGS
The granularity of seconds on microprocessors is crude and can result in times being reported for CPU usage which are too large by a second. BSD
November 9, 2011 BSD

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