[OH-Dev] [issue514] Implement bash mission

[aldeka]

New submission from aldeka <karen at openhatch.org>:

After the plot's written, and we've got decent mission validation or whatever,
we should code the mission's backend so that it actually exists!

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blockers: Write plot for new "Bash Mission", create a mission for cmd-line file manipulation (unix/linux) basics
messages: 2258
milestone: 0.11.09
nosy: TravisB, aldeka, janet, jesstess, palhmbs, paulproteus
priority: feature
status: unread
title: Implement bash mission

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Roundup issue tracker <bugs at openhatch.org>
<https://openhatch.org/bugs/issue514>
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