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RESTRICTED SHELL
       If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is used  to
       set  up  an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the following are disal-
       lowed or not performed:

       ·      changing directories with cd

       ·      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       ·      specifying command names containing /

       ·      specifying a file name containing a / as an argument to the .  builtin command

       ·      Specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       ·      importing function definitions from the shell environment at startup

       ·      parsing the value of SHELLOPTS from the shell environment at startup

       ·      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       ·      using the exec builtin command to replace the shell with another command

       ·      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       ·      Using the enable builtin command to enable disabled shell builtins

       ·      specifying the -p option to the command builtin command

       ·      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed (see COMMAND EXECUTION above), rbash  turns  off  any  restrictions  in  the  shell
       spawned to execute the script.