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UNIX in a Nutshell: System V Edition

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4.9 Restricted Shells

Restricted shells can be invoked in any of the following ways:

rksh	Korn shell
ksh -r
set -r

rsh	Bourne Shell
set -r

Restricted shells can also be set up by supplying rksh and rsh in the shell field of /etc/passwd or by using them as the value for the SHELL variable.

Restricted shells act the same as their non-restricted counterparts, except that the following are prohibited:

Shell scripts can still be run, since in that case the restricted shell will call ksh or sh to run the script.

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