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Screen User's Manual

6.4 Shell

Command: shell command

Command: defshell command

(none)
Set the command to be used to create a new shell. This overrides the value of the environment variable $SHELL. This is useful if you'd like to run a tty-enhancer which is expecting to execute the program specified in $SHELL. If the command begins with a `-' character, the shell will be started as a login-shell.

defshell is currently a synonym to the shell command.

Command: shelltitle title

(none)
Set the title for all shells created during startup or by the C-a C-c command. See section 10.1 Naming Windows (Titles), for details about what titles are.