I'm trying to measure the execution time of a process that I call via the command line (i.e., I want to find out how long it takes to for the process to finish). Is there any command that I can add to the command calling the process that will achieve this?
time before the command you want to measure.
The output will look like:
real 0m0.606s user 0m0.000s sys 0m0.002s
real: Elapsed real (wall clock) time used by the process, in seconds.
user: Total number of CPU-seconds that the process used directly (in user mode), in seconds.
sys: Total number of CPU-seconds used by the system on behalf of the process (in kernel mode), in seconds.
For a line-by-line delta measurement, try gnomon.
It is a command line utility, a bit like moreutils's ts, to prepend timestamp information to the standard output of another command. Useful for long-running processes where you'd like a historical record of what's taking so long.
Piping anything to gnomon will prepend a timestamp to each line, indicating how long that line was the last line in the buffer--that is, how long it took the next line to appear. By default, gnomon will display the seconds elapsed between each line, but that is configurable.
Occasionally I find myself needing a stopwatch to count how long it takes for an action like my app booting, in which case many of the solutions here are not useful.
For this I like to use sw.
wget -q -O - http://git.io/sinister | sh -s -- -u https://raw.githubusercontent.com/coryfklein/sw/master/sw
sw - start a stopwatch from 0, save start time in ~/.sw sw [-r|--resume] - start a stopwatch from the last saved start time (or current time if no last saved start time exists) - "-r" stands for --resume