Countdown Clock

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!"; }
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
By: kniht
2010-06-30 12:20:01

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
  • Countdown clock - Counts down from $MIN minutes to zero. I let the date command do the maths. This version doesn't use seq. Show Sample Output


    11
    MIN=10;for ((i=MIN*60;i>=0;i--));do echo -ne "\r$(date -d"0+$i sec" +%H:%M:%S)";sleep 1;done
    flatcap · 2011-02-20 11:56:28 13

  • 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 59

What Others Think

The spaces after S=" " expanded when copying and pasting, so that is not a worry.
aqwed80 · 490 weeks and 3 days ago
The following command will print the last command that starts with. You can replace anything after - with another word and it'll still work. Let me know in the comments what you think or if you have any questions. Lets get http://bestrvextendedwarranty.com/ to learn more new ways of warranty services. I will be making more Unix tutorials like this one in different topics if they are requested. Please feel free to message me on my Twitter account with any suggestions on commands to make tutorials on!
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Perfecthomepugs · 4 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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