Manual: rbash

RBASH(1)					   General Commands Manual					    RBASH(1)

NAME
       rbash - restricted bash, see bash(1)

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.

       •      Using the -p option to the .  builtin command to specify a search path.

       •      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 values of BASHOPTS and 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 shopt -u restricted_shell.

       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 restrictions in the shell  spawned
       to execute the script.

SEE ALSO
       bash(1)

Bash-5.2					      2021 November 22						    RBASH(1)