ee41670ffbecb000db873f839a7381495bbe2bc6
The comment explains the reason: we'd wait for the second \n and then ungetc() it. Then the buffered \n would cause a problem when the next prompt was issued, so in effect it wasn't possible to answer the second question.
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systemd - System and Service Manager
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General information about systemd can be found in the systemd Wiki.
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