Not so simple countdown from a given date

watch -tn1 'bc<<<"`date -d'\''friday 21:00'\'' +%s`-`date +%s`"|perl -ne'\''@p=gmtime($_);printf("%dd %02d:%02d:%02d\n",@p[7,2,1,0]);'\'
An improved version of http://www.commandlinefu.com/commands/view/1772/simple-countdown-from-a-given-date that uses Perl to pretty-print the output. Note that the GNU-style '--no-title' option has been replaced by its one-letter counterpart '-t'.
Sample Output
4d 23:15:43

-2
By: penpen
2009-03-29 19:53:36

These Might Interest You

  • Might be more useful if you were able to print it in Days HH:MM:SS format as: perl -e '@p=gmtime(234234);printf("%d Days %02d:%02d:%02ds\n",@p[7,2,1,0]);' But I'm not exactly sure how to replace the 234234 with the output of the countdown time. (Having some problems with nested quoting/command substitution). Help would be appreciated :)


    0
    watch --no-title -d -n 1 'echo `date -d "next Thursday" +%s` "-" `date +%s` | bc -l'
    jnash · 2009-03-29 06:53:09 4
  • 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


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    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 7
  • This is the 140 character long new year's countdown timer that was posted to the climagic account on twitter and identi.ca. There are saner ways of doing this of course, but probably none of those would fit. Uses the figlet command, but of course you can replace figlet with just echo if you want. Show Sample Output


    6
    while V=$((`date +%s -d"2010-01-01"`-`date +%s`));do if [ $V == 0 ];then figlet 'Happy New Year!';break;else figlet $V;sleep 1;clear;fi;done
    deltaray · 2009-12-30 18:42:38 6
  • 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

What Others Think

Nice.. Bash quoting is something I still haven't gotten the hang of yet.. But I can see its pretty nasty..
jnash · 481 weeks ago
@ atoponce: POSIX syntax is great and I use it a lot. However, many Unix/LInux users (even those who in all other respects speak bash fluently) are not familiar with it. I first DID use POSIX syntax here but then noticed that neither does the command require nesting nor is it likely that anybody will feel the urge to add nesting. The command is involved enough without using a widely unknown syntax so I decided to switch to backticks. I should add that POSIX syntax does not work in (t)csh while backticks do. I did not start this comment with the portability argument because the above command uses the '
penpen · 480 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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