/usr/share/fish/completions/atd.fish is in fish-common 2.4.0-1.
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 | #atd
complete -f -c atd -s l --description "Limiting load factor"
complete -f -c atd -s b --description "Minimum interval in seconds"
complete -f -c atd -s d --description "Debug mode"
complete -f -c atd -s s --description "Process at queue only once"
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