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rbash



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  identi­
       cally  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,
              ENV, or BASH_ENV

       ·      specifying command names containing /

       ·      specifying  a  file name containing a / as an argu­
              ment to the .  builtin command

       ·      Specifying a filename  containing  a  slash  as  an
              argument  to the -p option to the hash builtin com­
              mand

       ·      importing function definitions from the shell envi­
              ronment at startup

       ·      parsing the value of SHELLOPTS from the shell envi­
              ronment 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 exe­
       cuted (see COMMAND EXECUTION above), rbash turns  off  any
       restrictions in the shell spawned to execute the script.
  

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