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The following Bash function returns the number of seconds from now until the
specified time:

till() { echo $(($(date -d "$1" +%s) - $(date +%s))); }

For example, how long is it until 6 o’clock:

ldo@theon:~> till 06:00
20932

What’s the value of this? You can delay until a particular time before
performing an action, e.g.

sleep $(till 07:30); echo 'Wakey! Wakey!'

Lawrence D'Oliveiro wrote:
> The following Bash function returns the number of seconds from now until the
> specified time:
>
> till() { echo $(($(date -d "$1" +%s) - $(date +%s))); }
>
> For example, how long is it until 6 o’clock:
>
> ldo@theon:~> till 06:00
> 20932
>
> What’s the value of this? You can delay until a particular time before
> performing an action, e.g.
>
> sleep $(till 07:30); echo 'Wakey! Wakey!'
>
Why not just use 'at'? Otherwise you have your bash script hanging
around until 7:30, doing nothing.

Cheers,

Cliff

--

The ends justifies the means - Niccolò di Bernardo dei Machiavelli.

The end excuses any evil - Sophocles

On Apr 2, 12:15*am, Lawrence D'Oliveiro <l...@geek-
central.gen.new_zealand> wrote:
> The following Bash function returns the number of seconds from now until the
> specified time:
>
> * * till() { echo $(($(date -d "$1" +%s) - $(date +%s))); }
>
> For example, how long is it until 6 o’clock:
>
> * * ldo@theon:~> till 06:00
> * * 20932
>
> What’s the value of this? You can delay until a particular time before
> performing an action, e.g.
>
> * * sleep $(till 07:30); echo 'Wakey! Wakey!'

better:

! sleep $(till hammersmith)

or if you prefer a different genre:

! sleep $(till brooklyn)

--
Cheers
Anton