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time: Resource Measurement

 
 1 Measuring Program Resource Use
 ********************************
 
 The 'time' command runs another program, then displays information about
 the resources used by that program, collected by the system while the
 program was running.  You can select which information is reported and
 the format in which it is shown (⇒Setting Format), or have 'time'
 save the information in a file instead of displaying it on the screen
 (⇒Redirecting).
 
    The resources that 'time' can report on fall into the general
 categories of time, memory, and I/O and IPC calls.  Some systems do not
 provide much information about program resource use; 'time' reports
 unavailable information as zero values (⇒Accuracy).
 
    The format of the 'time' command is:
 
      time [option...] COMMAND [ARG...]
 
    'time' runs the program COMMAND, with any given arguments ARG....
 When COMMAND finishes, 'time' displays information about resources used
 by COMMAND.
 
    Here is an example of using 'time' to measure the time and other
 resources used by running the program 'grep':
 
      eg$ time grep nobody /etc/aliases
      nobody:/dev/null
      etc-files:nobody
      misc-group:nobody
      0.07user 0.50system 0:06.69elapsed 8%CPU (0avgtext+489avgdata 324maxresident)k
      46inputs+7outputs (43major+251minor)pagefaults 0swaps
 
    Mail suggestions and bug reports for GNU 'time' to
 'bug-time@gnu.org'.  Please include the version of 'time', which you can
 get by running 'time --version', and the operating system and C compiler
 you used.
 

Menu

 
· Setting Format      Selecting the information reported by 'time'.
· Format String       The information 'time' can report.
· Redirecting         Writing the information to a file.
· Examples            Examples of using 'time'.
· Accuracy            Limitations on the accuracy of 'time' output.
· Invoking time       Summary of the options to the 'time' command.
 

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