A very simple and useful stopwatch

time read (ctrl-d to stop)
time read -sn1 (s:silent, n:number of characters. Press any character to stop)

2009-03-20 22:50:06

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What Others Think

Neat. Though, in Z-shell, it seems that 'time' needs to be redirected, or it doesn't work. time > read
dnavarre · 482 weeks and 3 days ago
Correction: my comment should have read time > /dev/nul Or similar. Obviously, redirecting to a file will create an empty/garbage file.
dnavarre · 482 weeks and 3 days ago
Note that the text in brackets is not part of the command. Also, ENTER works as well as Ctrl-D.
ar · 482 weeks and 3 days ago
point_to_null · 482 weeks and 3 days ago
also does the same thing (with ctrl+d): time cat
garbage · 482 weeks and 2 days ago
@point_to_null time is a bash builtin but some OSes have their own time commands.
grep · 482 weeks and 1 day ago
@grep You are rigth. Was a mistake
point_to_null · 482 weeks and 1 day ago
the command time read -sn1 is better to stop it (by pressing any character...)
mrttlemonde · 470 weeks and 1 day ago
This one gives lap times on key presses and stops and gives a total when you press s total=0;nl=$'\n';key=go; while [[ $key != 's' ]]; do result=$( (time read -sn1; echo "$REPLY") 2>&1 );result=${result/$nl/ };key=${result#* };lap=${result% *}; thou=${lap#0};thou=${thou/.};let total+=$thou;echo "Lap $lap"; done; echo "Total ${total:0:${#total} - 3}.${total: -3:3}"
dennisw · 469 weeks and 5 days ago
Oops, I forgot to add this at the beginning of the line: TIMEFORMAT=%E; And this at the end: unset TIMEFORMAT
dennisw · 469 weeks and 5 days ago
Oops again! (why can't we edit these comments?) There should have been a semicolon right before the unset.
dennisw · 469 weeks and 5 days ago
Fixed a problem with leading zeros on very small intervals: shopt -s extglob;TIMEFORMAT=%E;total=0;nl=$'\n';key=go; while [[ $key != 's' ]]; do result=$( (time read -sn1; echo "$REPLY") 2>&1 ); result=${result/$nl/ }; key=${result#* }; lap=${result% *}; thou=${lap/.}; thou=${thou/#+(0)}; let total+=$thou; echo "Lap $lap"; done; echo "Total ${total:0:${#total} - 3}.${total: -3:3}"; unset TIMEFORMAT
dennisw · 469 weeks and 4 days ago
In zsh you need to do: time ( read )
xawl · 392 weeks and 1 day ago
Since time is meant to monitor, you can monitor programs and bash scripts. I had a boss who was a real demon about this.
tevans · 237 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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