# phpman > man > RBASH(1)

[RBASH(1)](https://www.chedong.com/phpMan.php/man/RBASH/1/markdown)                               General Commands Manual                              [RBASH(1)](https://www.chedong.com/phpMan.php/man/RBASH/1/markdown)



## NAME
       rbash - restricted bash, see [**bash**(1)](https://www.chedong.com/phpMan.php/man/bash/1/markdown)

## 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
       disallowed or not performed:

       •      changing directories with **cd**

       •      setting or unsetting the values of **SHELL**, **PATH**, **HISTFILE**, **ENV**, or **BASH**___**ENV**

       •      specifying command names containing **/**

       •      specifying a filename containing a **/** as an argument to the **.**  builtin command

       •      specifying a filename containing a slash as an argument to the **history** 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, **rbash** turns off  any  restric‐
       tions in the shell spawned to execute the script.

## SEE ALSO
       [bash(1)](https://www.chedong.com/phpMan.php/man/bash/1/markdown)



GNU Bash-4.0                                 2004 Apr 20                                    [RBASH(1)](https://www.chedong.com/phpMan.php/man/RBASH/1/markdown)