CODEWITHSUNDEEP
linuxgnu
Andna
Andna

Reputation: 6689

Gnu time and formatting output

I wanted to use gnu time to measure running time of some little .c programs. In the man it is written that:

-f FORMAT, --format FORMAT
Use FORMAT as the format string that controls the output of time.  See the below more information.

Then in examples we have:

To run the command `ls -Fs' and show just the user, system, and total time:
time -f "%E real,%U user,%S sys" ls -Fs

But when I try to issue this command from example i get:

time -f '%E real,%U user,%S sys' ls -Fs
-f: command not found

real    0m0.134s
user    0m0.084s
sys     0m0.044s

I am wondering where is the problem, where am I making a mistake? I just want to show the user time, that is why I am toying with time output format.

Upvotes: 17

Views: 8043

Answers (2)

tobiasBora
tobiasBora

Reputation: 2372

The documentation also mentions env time to use the time command from the system (it uses /usr/bin/env or alike, so it should be independent of the shell).

Upvotes: 1

minopret
minopret

Reputation: 4806

Bash for one has a shell builtin named time. One way to get past it is to type command time - command will ignore the builtins and run the time program from your $PATH. Another way is alias time=/usr/bin/time. On the other hand the bash builtin respects environment variable TIMEFORMAT.

Upvotes: 18

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