Seeding from the 1.2 tree.

bitchx-docs/4_Misc/set/shell_flags

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+Synopsis:
+   set shell_flags [<flags>]
+
+Description:
+   This variable contains any flags that are to be passed to the command
+   shell used by the EXEC command.  The -c switch is generally required
+   by all shells, though others may be available as well; consult your
+   shell's documentation.
+
+See Also:
+   exec(5); set(4) shell
+