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 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 Note that the GNU-style '--no-title' option has been replaced by its one-letter counterpart '-t'.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

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

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 · 668 weeks and 3 days 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 · 668 weeks and 3 days ago
seofox · 8 weeks and 5 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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