uses the -u switch for UTC
Another way could be
echo $(($(date -ud "00:29:36" +%s)%86400))
Can be used for command line parameters too.
If you have a more complicated way of entering values (validation, GUI, ...), then write a function i.e. EnterValue() that echoes the value and then you can write:
param=${param:-$(EnterValue)}
No command substitution but subshell redirection
Just to avoid link to itself
Returns true if user presses the key.
Use it like
Confirm "Continue" && do action
It works as a method applicated to a variable, converts the string variable into an array Show Sample Output
Removes all the at shedules jobs
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