# rbash > Restricted Bash shell. > Restrictions implemented in rbash. > The cd command is not allowed. > PATH and ENV (setting/unsetting). > Importing function. > Specifying file name containing argument ‘/’. > Specifying file name containing argument ‘-‘. > Redirecting output using ‘>‘, ‘>>‘, ‘>|‘, ‘<>‘, ‘>&‘, ‘&>‘. > Turning off restriction using ‘set +r‘ or ‘set +o‘. - Start rbash: `rbash` - Execute a command: `rbash -c "{{command}}"` - Run commands from a file: `rbash {{file.sh}}` - Print the version information of rbash: `rbash --version`