screen: Session Name
8.5 Session Name
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-- Command: sessionname [NAME]
(none)
Rename the current session. Note that for 'screen -list' the name
shows up with the process-id prepended. If the argument NAME is
omitted, the name of this session is displayed.
_Caution_: The '$STY' environment variable will still reflect the
old name in pre-existing shells. This may result in confusion.
Use of this command is generally discouraged. Use the '-S'
command-line option if you want to name a new session.The default
is constructed from the tty and host names.