/lib/systemd/system/bitlbee@.service is in bitlbee-common 3.5.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | [Unit]
Description=BitlBee Per-Connection Server
[Service]
ExecStart=/usr/sbin/bitlbee -I
StandardInput=socket
User=bitlbee
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