GNU Rush
	Restricted User Shell	Sergey Poznyakoff

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4.4.2.2 Membership operators

Membership operators check if their argument is a member of some set of values. There are two such operators.

lhs in ( args )

The in operator evaluates to ‘true’ if lhs is listed in args, which is a whitespace-separated list of strings. For example:

  match $0 in ("scp" "rsync")

The group operator evaluates to ‘true’ if the requesting user is a member of at least one group listed in its right-hand side. It can have two forms:

group grp

Evaluate to ‘true’ if the user is a member of the group grp. The group can be given either by its name or GID.

group ( list )

Evaluate to ‘true’ if the user is a member of one of the groups in whitespace delimited list. Members of list are group names or GIDs.