snooper(1) on Linux
The text ab13696b5f51, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it. The page shows this text now.
a utility for capturing data flowing between serial devices
Flags it lists
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-b -
-h -
-n -
-t -
-u -
-x