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If Bash is started with the name rbash, or the --restricted or -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. A restricted shell behaves identically to bash with the exception that the following are disallowed or not performed:

�* Changing directories with the cd built-in.
�* Setting or unsetting the values of the SHELL, PATH, ENV, or BASH_ENV variables.
�* Specifying command names containing slashes.
�* Specifying a filename containing a slash as an argument to the . built-in command.
�* Specifying a filename containing a slash as an argument to the -p option to the hash built-in 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 built-in to replace the shell with another command.
�* Adding or deleting built-in commands with the -f and -d options to the enable built-in.
�* Using the enable built-in command to enable disabled shell built-ins.
�* Specifying the -p option to the command built-in.