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Daniella Mesquita
Asked: 2022-12-27 09:26:06 +0800 CST

Bash: control a prompt program

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I've searched all over Google and the StackExchange sites, but all of the answers may work for the programs they used, but not for this (timecalc).

This program is similar of fsck, having a ">>>+" prompt when opened and, apparently, not supporting receiving programmatic usage/commands unless through a Bash trick.

How to send commands to timecalc as if using its prompt but from an external bash script? [OPTIONAL] Bonus: a solution that works also at fsck and most of other prompt/interaction-only programs.

./timecalc sample command to test: 15:00 - 5:00 (should return "10:00" to the bash script)

command-line

1 Answers

  1. Best Answer

    For example:

    $ echo 15:00 - 5:00 | timecalc-linux | head -n1 | sed 's,^>>> ,,'
10:00
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