You want to make the unit file usable again so that it can later be enabled and started, but you do not want to start the service immediately. Which single command accomplishes this goal?
The systemctl mask sub-command replaces a unit file with a symbolic link to /dev/null, preventing any form of activation. The complementary systemctl unmask command removes that link, restoring the original unit file so the unit can once again be enabled or started. Because unmask does not, by itself, start or enable the service, it satisfies the requirement of making the unit operational without immediately launching it.
Running systemctl enable alone would fail because the unit is still masked; systemctl revert would also remove any drop-in overrides in addition to unmasking, which is unnecessary here; systemctl link expects an absolute path to a unit file outside the usual search path and is not used for masked units.
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CompTIA Linux+ XK0-006 (V8)
Services and User Management
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