menu "Shells"
-INSERT
-
-config ASH
- bool "ash"
- default y
- depends on !NOMMU
- help
- Tha 'ash' shell adds about 60k in the default configuration and is
- the most complete and most pedantically correct shell included with
- busybox. This shell is actually a derivative of the Debian 'dash'
- shell (by Herbert Xu), which was created by porting the 'ash' shell
- (written by Kenneth Almquist) from NetBSD.
-
-config ASH_BASH_COMPAT
- bool "bash-compatible extensions"
- default y
- depends on ASH
- help
- Enable bash-compatible extensions.
-
-config ASH_JOB_CONTROL
- bool "Job control"
- default y
- depends on ASH
- help
- Enable job control in the ash shell.
-
-config ASH_ALIAS
- bool "alias support"
- default y
- depends on ASH
- help
- Enable alias support in the ash shell.
-
-config ASH_GETOPTS
- bool "Builtin getopt to parse positional parameters"
- default y
- depends on ASH
- help
- Enable getopts builtin in the ash shell.
-
-config ASH_BUILTIN_ECHO
- bool "Builtin version of 'echo'"
- default y
- depends on ASH
- help
- Enable support for echo, builtin to ash.
-
-config ASH_BUILTIN_PRINTF
- bool "Builtin version of 'printf'"
- default y
- depends on ASH
- help
- Enable support for printf, builtin to ash.
-
-config ASH_BUILTIN_TEST
- bool "Builtin version of 'test'"
- default y
- depends on ASH
- help
- Enable support for test, builtin to ash.
-
-config ASH_CMDCMD
- bool "'command' command to override shell builtins"
- default y
- depends on ASH
- help
- Enable support for the ash 'command' builtin, which allows
- you to run the specified command with the specified arguments,
- even when there is an ash builtin command with the same name.
-
-config ASH_MAIL
- bool "Check for new mail on interactive shells"
- default n
- depends on ASH
- help
- Enable "check for new mail" in the ash shell.
-
-config ASH_OPTIMIZE_FOR_SIZE
- bool "Optimize for size instead of speed"
- default y
- depends on ASH
- help
- Compile ash for reduced size at the price of speed.
-
-config ASH_RANDOM_SUPPORT
- bool "Pseudorandom generator and $RANDOM variable"
- default y
- depends on ASH
- help
- Enable pseudorandom generator and dynamic variable "$RANDOM".
- Each read of "$RANDOM" will generate a new pseudorandom value.
- You can reset the generator by using a specified start value.
- After "unset RANDOM" the generator will switch off and this
- variable will no longer have special treatment.
-
-config ASH_EXPAND_PRMT
- bool "Expand prompt string"
- default y
- depends on ASH
- help
- "PS#" may contain volatile content, such as backquote commands.
- This option recreates the prompt string from the environment
- variable each time it is displayed.
-
-config HUSH
- bool "hush"
- default y
- help
- hush is a small shell (22k). It handles the normal flow control
- constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
- case/esac. Redirections, here documents, $((arithmetic))
- and functions are supported.
-
- It will compile and work on no-mmu systems.
-
- It does not handle select, aliases, brace expansion,
- tilde expansion, &>file and >&file redirection of stdout+stderr.
-
-config HUSH_BASH_COMPAT
- bool "bash-compatible extensions"
- default y
- depends on HUSH
- help
- Enable bash-compatible extensions.
-
-config HUSH_HELP
- bool "help builtin"
- default y
- depends on HUSH
- help
- Enable help builtin in hush. Code size + ~1 kbyte.
-
-config HUSH_INTERACTIVE
- bool "Interactive mode"
- default y
- depends on HUSH
- help
- Enable interactive mode (prompt and command editing).
- Without this, hush simply reads and executes commands
- from stdin just like a shell script from a file.
- No prompt, no PS1/PS2 magic shell variables.
-
-config HUSH_JOB
- bool "Job control"
- default y
- depends on HUSH_INTERACTIVE
- help
- Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
- command (not entire shell), fg/bg builtins work. Without this option,
- "cmd &" still works by simply spawning a process and immediately
- prompting for next command (or executing next command in a script),
- but no separate process group is formed.
-
-config HUSH_TICK
- bool "Process substitution"
- default y
- depends on HUSH
- help
- Enable process substitution `command` and $(command) in hush.
-
-config HUSH_IF
- bool "Support if/then/elif/else/fi"
- default y
- depends on HUSH
- help
- Enable if/then/elif/else/fi in hush.
-
-config HUSH_LOOPS
- bool "Support for, while and until loops"
- default y
- depends on HUSH
- help
- Enable for, while and until loops in hush.
-
-config HUSH_CASE
- bool "Support case ... esac statement"
- default y
- depends on HUSH
- help
- Enable case ... esac statement in hush. +400 bytes.
-
-config HUSH_FUNCTIONS
- bool "Support funcname() { commands; } syntax"
- default y
- depends on HUSH
- help
- Enable support for shell functions in hush. +800 bytes.
-
-config HUSH_LOCAL
- bool "Support local builtin"
- default y
- depends on HUSH_FUNCTIONS
- help
- Enable support for local variables in functions.
-
-config HUSH_EXPORT_N
- bool "Support export '-n' option"
- default y
- depends on HUSH
- help
- Enable support for export '-n' option in hush. It is a bash extension.
-
-config HUSH_RANDOM_SUPPORT
- bool "Pseudorandom generator and $RANDOM variable"
- default y
- depends on HUSH
- help
- Enable pseudorandom generator and dynamic variable "$RANDOM".
- Each read of "$RANDOM" will generate a new pseudorandom value.
-
choice
prompt "Choose which shell is aliased to 'sh' name"
- default FEATURE_SH_IS_ASH
+ default SH_IS_ASH
help
Choose which shell you want to be executed by 'sh' alias.
The ash shell is the most bash compatible and full featured one.
# note: cannot use "select ASH" here, it breaks "make allnoconfig"
-config FEATURE_SH_IS_ASH
- depends on ASH
- bool "ash"
+config SH_IS_ASH
depends on !NOMMU
+ bool "ash"
+ help
+ Choose ash to be the shell executed by 'sh' name.
+ The ash code will be built into busybox. If you don't select
+ "ash" choice (CONFIG_ASH), this shell may only be invoked by
+ the name 'sh' (and not 'ash').
-config FEATURE_SH_IS_HUSH
- depends on HUSH
+config SH_IS_HUSH
bool "hush"
+ help
+ Choose hush to be the shell executed by 'sh' name.
+ The hush code will be built into busybox. If you don't select
+ "hush" choice (CONFIG_HUSH), this shell may only be invoked by
+ the name 'sh' (and not 'hush').
-config FEATURE_SH_IS_NONE
+config SH_IS_NONE
bool "none"
endchoice
choice
prompt "Choose which shell is aliased to 'bash' name"
- default FEATURE_BASH_IS_NONE
+ default BASH_IS_NONE
help
Choose which shell you want to be executed by 'bash' alias.
- The ash shell is the most bash compatible and full featured one.
+ The ash shell is the most bash compatible and full featured one,
+ although compatibility is far from being complete.
Note that selecting this option does not switch on any bash
compatibility code. It merely makes it possible to install
can't be used for running them because it won't recongnize
"bash" as a supported applet name.
-config FEATURE_BASH_IS_ASH
- depends on ASH
- bool "ash"
+config BASH_IS_ASH
depends on !NOMMU
+ bool "ash"
+ help
+ Choose ash to be the shell executed by 'bash' name.
+ The ash code will be built into busybox. If you don't select
+ "ash" choice (CONFIG_ASH), this shell may only be invoked by
+ the name 'bash' (and not 'ash').
-config FEATURE_BASH_IS_HUSH
- depends on HUSH
+config BASH_IS_HUSH
bool "hush"
+ help
+ Choose hush to be the shell executed by 'bash' name.
+ The hush code will be built into busybox. If you don't select
+ "hush" choice (CONFIG_HUSH), this shell may only be invoked by
+ the name 'bash' (and not 'hush').
-config FEATURE_BASH_IS_NONE
+config BASH_IS_NONE
bool "none"
endchoice
-config LASH
- bool "lash (deprecated: aliased to hush)"
- default n
- select HUSH
- help
- lash is deprecated and will be removed, please migrate to hush.
-
-config MSH
- bool "msh (deprecated: please use hush)"
- default n
- select HUSH
- help
- msh is deprecated and will be removed, please migrate to hush.
- If there is a feature msh has but hush does not, please let us know.
-
-# The minix shell (adds just 30k) is quite complete and handles things
-# like for/do/done, case/esac and all the things you expect a Bourne
-# shell to do. It is not always pedantically correct about Bourne
-# shell grammar (try running the shell testscript "tests/sh.testcases"
-# on it and compare vs bash) but for most things it works quite well.
-# It uses only vfork, so it can be used on uClinux systems.
+INSERT
-config SH_MATH_SUPPORT
+config FEATURE_SH_MATH
bool "POSIX math support"
default y
- depends on ASH || HUSH
+ depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
Enable math support in the shell via $((...)) syntax.
-config SH_MATH_SUPPORT_64
+config FEATURE_SH_MATH_64
bool "Extend POSIX math support to 64 bit"
default y
- depends on SH_MATH_SUPPORT
+ depends on FEATURE_SH_MATH
help
Enable 64-bit math support in the shell. This will make the shell
slightly larger, but will allow computation with very large numbers.
config FEATURE_SH_EXTRA_QUIET
bool "Hide message on interactive shell startup"
default y
- depends on HUSH || ASH
+ depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
Remove the busybox introduction when starting a shell.
config FEATURE_SH_STANDALONE
bool "Standalone shell"
default n
- depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
+ depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
This option causes busybox shells to use busybox applets
in preference to executables in the PATH whenever possible. For
config FEATURE_SH_NOFORK
bool "Run 'nofork' applets directly"
default n
- depends on (HUSH || ASH) && FEATURE_PREFER_APPLETS
+ depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
- This option causes busybox shells [currently only ash]
- to not execute typical fork/exec/wait sequence, but call <applet>_main
- directly, if possible. (Sometimes it is not possible: for example,
+ This option causes busybox shells to not execute typical
+ fork/exec/wait sequence, but call <applet>_main directly,
+ if possible. (Sometimes it is not possible: for example,
this is not possible in pipes).
This will be done only for some applets (those which are marked
This may significantly speed up some shell scripts.
- This feature is relatively new. Use with care.
+ This feature is relatively new. Use with care. Report bugs
+ to project mailing list.
-config CTTYHACK
- bool "cttyhack"
+config FEATURE_SH_HISTFILESIZE
+ bool "Use $HISTFILESIZE"
default y
+ depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
- One common problem reported on the mailing list is "can't access tty;
- job control turned off" error message which typically appears when
- one tries to use shell with stdin/stdout opened to /dev/console.
- This device is special - it cannot be a controlling tty.
-
- Proper solution is to use correct device instead of /dev/console.
-
- cttyhack provides "quick and dirty" solution to this problem.
- It analyzes stdin with various ioctls, trying to determine whether
- it is a /dev/ttyN or /dev/ttySN (virtual terminal or serial line).
- If it detects one, it closes stdin/out/err and reopens that device.
- Then it executes given program. Opening the device will make
- that device a controlling tty. This may require cttyhack
- to be a session leader.
-
- Example for /etc/inittab (for busybox init):
-
- ::respawn:/bin/cttyhack /bin/sh
-
- Giving controlling tty to shell running with PID 1:
-
- $ exec cttyhack sh
-
- Starting an interactive shell from boot shell script:
+ This option makes busybox shells to use $HISTFILESIZE variable
+ to set shell history size. Note that its max value is capped
+ by "History size" setting in library tuning section.
- setsid cttyhack sh
endmenu
projects / oweals / busybox.git / blobdiff