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Comment by denysonique | Hacker News Reader

On UNIX likes systems*. Pro-tip: `watch -n 1 date +%s` will give you a live view of the timestamp

Oohhh, didn't know about watch, thanks! If you want it to count down instead:

$ watch -n1 'echo $((1500000000 - $(date +%s)))'

If you have an X server installed, you can also get a windowed unix time clock:

  xclock -utime -update 1

I tried this and noticed that you forgot -digital, which is apparently necessarily for -utime to have any effect.