Countdown Clock

MIN=10;for ((i=MIN*60;i>=0;i--));do echo -ne "\r$(date -d"0+$i sec" +%H:%M:%S)";sleep 1;done
Countdown clock - Counts down from $MIN minutes to zero. I let the date command do the maths. This version doesn't use seq.
Sample Output
00:09:59

11
By: flatcap
2011-02-20 11:56:28

4 Alternatives + Submit Alt

  • Simple countdown clock that should be quite portable across any Bourne-compatible shell. I used to teach for a living, and I would run this code when it was time for a break. Usually, I would set "MIN" to 15 for a 15-minute break. The computer would be connected to a projector, so this would be projected on screen, front and center, for all to see. Show Sample Output


    12
    MIN=1 && for i in $(seq $(($MIN*60)) -1 1); do echo -n "$i, "; sleep 1; done; echo -e "\n\nBOOOM! Time to start."
    atoponce · 2010-06-20 15:19:12 165
  • The biggest advantage over atoponce's nifty original is not killing the scrollback. Written assuming bash, but shouldn't be terribly difficult to port to other shells. S should be multiple spaces, but I can't get commandlinefu to save/show them properly, any help?


    1
    function countdown { case "$1" in -s) shift;; *) set $(($1 * 60));; esac; local S=" "; for i in $(seq "$1" -1 1); do echo -ne "$S\r $i\r"; sleep 1; done; echo -e "$S\rBOOM!"; }
    kniht · 2010-06-30 12:20:01 4

  • 0
    MIN=10 && for i in $(seq $(($MIN*60)) -1 1); do printf "\r%02d:%02d:%02d" $((i/3600)) $(( (i/60)%60)) $((i%60)); sleep 1; done
    bugmenot · 2011-02-20 10:24:22 2
  • I find the other timers are inaccurate. It takes some microseconds to perform the date function. Therefore, using date/time math to calculate the time for us results in millisecond accuracy. This is tailored to the BusyBox date function. May need to change things around for GNU date function. Show Sample Output


    -1
    let T=$(date +%s)+3*60;while [ $(date +%s) -le $T ]; do let i=$T-$(date +%s); echo -ne "\r$(date -d"0:0:$i" +%H:%M:%S)"; sleep 0.3; done
    davidk · 2019-10-22 15:04:21 60

What Others Think

wonderful, I made a function out of it to be more variable: countdown () { MIN=$1; for ((i=$((MIN*60));i>=0;i--));do echo -ne "\r$(date -d"0+$i sec" +%H:%M:%S)";sleep 1;done;} to call it with "countdown 10" for 10 min, "countdown 5" for 5 min, ... thx
tcfusion · 615 weeks and 4 days ago
You're already in an arithmetic context in the for statement. There's no need for $(()): MIN=10;for ((i=MIN*60;i>=0;i--));do echo -ne "\r$(date -d"0+$i sec" +%H:%M:%S)";sleep 1;done
dennisw · 614 weeks and 3 days ago
@dennisw: Very good point. Thanks for that. I've updated the command.
flatcap · 614 weeks and 2 days ago
test this! MIN=1;for ((i=MIN*60;i>=0;i--));do echo -ne "\r$(date -d"0+$i sec" +%H:%M:%S)";sleep 1;ls ; done
el3ctron · 612 weeks and 1 day ago
Hi, How do I get this to work on Ksh88 :-(-
newbie01linux · 534 weeks ago
hi flatcap do you know how I can get your command to work in ksh88?
newbie01linux · 534 weeks ago
@newbie01linux: Sorry, I don't know and I don't have access to ksh88. Fedora has ksh93 and the command works in that.
flatcap · 534 weeks ago
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seofox · 44 weeks and 1 day ago
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seofox · 43 weeks and 2 days ago
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rahimhh21 · 14 weeks and 4 days ago
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Perfecthomepugs · 5 weeks and 3 days ago
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Perfecthomepugs · 5 weeks and 3 days ago

What do you think?

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