time - measure how long a command or block takes — fish-shell 3.4.0 documentation

# time - measure how long a command or block takes

## Synopsis

    time COMMAND

## Description

`time` causes fish to measure how long a command takes and print the results afterwards. The command can be a simple fish command or a block. The results can not currently be redirected.

For checking timing after a command has completed, check $CMD_DURATION.

Your system most likely also has a `time` command. To use that use something like `command time`, as in `command time sleep 10`. Because it’s not inside fish, it won’t have access to fish functions and won’t be able to time blocks and such.

## Example

(for obvious reasons exact results will vary on your system)

    >_ time sleep 1s

    ________________________________________________________
    Executed in    1,01 secs   fish           external
       usr time    2,32 millis    0,00 micros    2,32 millis
       sys time    0,88 millis  877,00 micros    0,00 millis

    >_ time for i in 1 2 3; sleep 1s; end

    ________________________________________________________
    Executed in    3,01 secs   fish           external
       usr time    9,16 millis    2,94 millis    6,23 millis
       sys time    0,23 millis    0,00 millis    0,23 millis

Inline variable assignments need to follow the `time` keyword:

    >_ time a_moment=1.5m sleep $a_moment

    ________________________________________________________
    Executed in   90.00 secs      fish           external
       usr time    4.62 millis    4.62 millis    0.00 millis
       sys time    2.35 millis    0.41 millis    1.95 millis