The Restricted Shell

If Bash is started with the name rbash, or the --restricted option is supplied at invocation, it is an environment more controlled than the standard shell.

The following are disallowed:

• Changing directories with the cd builtin.
• Setting or unsetting the values of the SHELL or PATH variables.
• Specifying command names containing slashes. (example /usr/sbin/netstat
• Specifying a filename containing a slash as an argument to the . 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 to replace the shell with another command.
• Adding or deleting builtin commands with the -f and -d options to the enable builtin.
• Specifying the -p option to the command builtin.
• Turning off restricted mode with set +r or set +o restricted.

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