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Keeping the computer awake

While a session is printing, Alto keeps the computer from sleeping, and lets it sleep a while after the last session goes quiet. The window title says “keeping awake” while it does.

Terminal window
alto keep-awake          # show the setting
alto keep-awake 30       # 30 minutes after the last output
alto keep-awake 90s
alto keep-awake 1h30m
alto keep-awake on       # the default, 1m
alto keep-awake always   # while any session runs, printing or not
alto keep-awake off

Changes apply to running sessions at once. It’s keep_awake_after in settings.