Binary clock

echo "10 i 2 o $(date +"%H%M"|cut -b 1,2,3,4 --output-delimiter=' ') f"|dc|tac|xargs printf "%04d\n"|tr "01" ".*"
displays current time in "binary clock" format (loosely) inspired by: http://www.thinkgeek.com/homeoffice/lights/59e0/ "Decoding": 8421 .... - 1st hour digit: 0 *..* - 2nd hour digit: 9 (8+1) .*.. - 1st minutes digit: 4 *..* - 2nd minutes digit: 9 (8+1) Prompt-command version: PROMPT_COMMAND='echo "10 i 2 o $(date +"%H%M"|cut -b 1,2,3,4 --output-delimiter=" ") f"|dc|tac|xargs printf "%04d\n"|tr "01" ".*"'
Sample Output
....
....
.*..
...*

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What Others Think

ta
Dereckson · 406 weeks and 4 days ago
tac is a command from GNU coreutils. It's so not installed by default on several UNIX. If you install it from /usr/ports/sysutils/coreutils on FreeBSD, use gtac instead of tac: echo "10 i 2 o $(date +"%H%M"|cut -b 1,2,3,4 --output-delimiter=' ') f"|dc|gtac|xargs printf "%04d\n"|tr "01" ".*"
Dereckson · 406 weeks and 4 days ago

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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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