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+++ This bug was initially created as a clone of Bug #1948586 +++

From manual page:

              -r      Enables  the  restricted  shell.   This option cannot be
                      unset once set.

  But one can exit it with:

$ set +r

  One can work an a restricted shell with:

+ Create a ~/.profile that sets PATH to, for example, /rbin
+ Add symbolic links to /rbin, e.g.
  # ln -sf /bin/ls /rbin
+ Remove any unwanted environment variable or function from
  ~/.profile with unset.

  Above works with bash, on basic tests using .bash_profile:

export PATH=/rbin
unset command_not_found_handle

and user shell set to /bin/rbash

  Restricted shells overall are somewhat of a fragile solution,
but if the environment is really very small, it is a somewhat
safe option.

Upstream commit with fix: https://github.com/ksh93/ksh/commit/74b4162178c8a2347491b9fd3a22d8e6e1b7e831

C8S PR: https://gitlab.com/redhat/centos-stream/rpms/ksh/-/merge_requests/9

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