4.8. Restricted Shells
Restricted shells can be invoked in any of the following ways:
rksh Korn shell ksh -r set -r /usr/lib/rsh Bourne shell set -r
Restricted shells can also be set up by supplying the full pathname to rksh or 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 nonrestricted counterparts, except that the following are prohibited:
Shell scripts can still be run, since in that case the restricted shell calls ksh or sh to run the script. This includes the /etc/profile, $HOME/.profile, and $ENV files.
Restricted shells are not used much in practice, as they are difficult to set up correctly.
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