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 be-
haves identically to bash with the exception that the following are dis-
allowed 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 >> redirec-
tion 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 re-
stricted_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)
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