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

3 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


    11
    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 2
  • 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 1

  • 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 0

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 · 382 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+$i sec" +%H:%M:%S)";sleep 1;done
dennisw · 381 weeks and 3 days ago
@dennisw: Very good point. Thanks for that. I've updated the command.
flatcap · 381 weeks and 3 days ago
test this! MIN=1;for ((i=MIN*60;i>=0;i--));do echo -ne "\r$(date -d"0+$i sec" +%H:%M:%S)";sleep 1;ls ; done
el3ctron · 379 weeks and 1 day ago
Hi, How do I get this to work on Ksh88 :-(-
newbie01linux · 301 weeks and 1 day ago
hi flatcap do you know how I can get your command to work in ksh88?
newbie01linux · 301 weeks and 1 day 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 · 301 weeks 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?

You must be signed in to comment.

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands



Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: