seqdiag(1) on Linux
The text d6acae07f366, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it. The page shows this text now.
generate sequence-diagram image file from spec-text file.
Flags it lists
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--antialias -
--config -
--font -
--help -
--version -
-T -
-a -
-c -
-f -
-h -
-o