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Advanced Bash Scripting Guide 5.2 (Stable branch)
03-14-2008
The Advanced Bash Scripting Guide is both areference and a tutorial on shell scripting. Thiscomprehensive book (the equivalent of 880+ printpages) covers almost every aspect of shellscripting. It contains 340 profusely commentedillustrative examples, a number of tables, and across-linked index/glossary. Not just a shellscripting tutorial, this book also provides anintroduction to basic programming techniques, suchas sorting and recursion. It is well suited foreither individual study or classroom use. Itcovers Bash, up to and including version 3.2x.License: GNU Free Documentation License (FDL)Changes:|
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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 follow- ing are disallowed or not performed: o changing directories with cd o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV o specifying command names containing / o specifying a file name containing a / as an argument to the . builtin command o specifying a filename containing a slash as an argument to the -p option to the hash builtin command o importing function definitions from the shell environment at startup o parsing the value of SHELLOPTS from the shell environment at startup o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators o using the exec builtin command to replace the shell with another command o adding or deleting builtin commands with the -f and -d options to the enable builtin command o using the enable builtin command to enable disabled shell builtins o specifying the -p option to the command builtin command o 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) GNU Bash-4.0 2004 Apr 20 RBASH(1)