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GNU Info (time.info)Resource MeasurementMeasuring 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 (Note: Setting Format), or have `time' save the information in a file instead of displaying it on the screen (Note: 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 (Note: 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-gnu-utils@prep.ai.mit.edu'. Please include the version of `time', which you can get by running `time --version', and the operating system and C compiler you used.
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