RBASH
Section: User Commands (1)
Updated: 2004 Apr 20
Page Index
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
- •
-
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 restrictions in the shell spawned to execute the
script.
SEE ALSO
bash(1)