# DO NOT EDIT. This file is generated from Config.src # # For a description of the syntax of this configuration file, # see docs/Kconfig-language.txt. # menu "Shells" choice prompt "Choose which shell is aliased to 'sh' name" default BUSYBOX_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 BUSYBOX_ASH" here, it breaks "make allnoconfig" config BUSYBOX_SH_IS_ASH depends on !BUSYBOX_NOMMU bool "ash" select BUSYBOX_SHELL_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 BUSYBOX_SH_IS_HUSH bool "hush" select BUSYBOX_SHELL_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 BUSYBOX_SH_IS_NONE bool "none" endchoice choice prompt "Choose which shell is aliased to 'bash' name" default BUSYBOX_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, 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 /bin/bash (sym)link and run scripts which start with #!/bin/bash line. Many systems use it in scripts which use bash-specific features, even simple ones like $RANDOM. Without this option, busybox can't be used for running them because it won't recongnize "bash" as a supported applet name. config BUSYBOX_BASH_IS_ASH depends on !BUSYBOX_NOMMU bool "ash" select BUSYBOX_SHELL_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 BUSYBOX_BASH_IS_HUSH bool "hush" select BUSYBOX_SHELL_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 BUSYBOX_BASH_IS_NONE bool "none" endchoice config BUSYBOX_SHELL_ASH bool #hidden option depends on !BUSYBOX_NOMMU config BUSYBOX_ASH bool "ash (78 kb)" default y depends on !BUSYBOX_NOMMU select BUSYBOX_SHELL_ASH help 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. # ash options # note: Don't remove !NOMMU part in the next line; it would break # menuconfig's indenting. if !BUSYBOX_NOMMU && (BUSYBOX_SHELL_ASH || BUSYBOX_ASH || BUSYBOX_SH_IS_ASH || BUSYBOX_BASH_IS_ASH) config BUSYBOX_ASH_OPTIMIZE_FOR_SIZE bool "Optimize for size instead of speed" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_INTERNAL_GLOB bool "Use internal glob() implementation" default y # Y is bigger, but because of uclibc glob() bug, let Y be default for now depends on BUSYBOX_SHELL_ASH help Do not use glob() function from libc, use internal implementation. Use this if you are getting "glob.h: No such file or directory" or similar build errors. Note that as of now (2017-01), uclibc and musl glob() both have bugs which would break ash if you select N here. config BUSYBOX_ASH_BASH_COMPAT bool "bash-compatible extensions" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_BASH_SOURCE_CURDIR bool "'source' and '.' builtins search current directory after $PATH" default n # do not encourage non-standard behavior depends on BUSYBOX_ASH_BASH_COMPAT help This is not compliant with standards. Avoid if possible. config BUSYBOX_ASH_BASH_NOT_FOUND_HOOK bool "command_not_found_handle hook support" default y depends on BUSYBOX_ASH_BASH_COMPAT help Enable support for the 'command_not_found_handle' hook function, from GNU bash, which allows for alternative command not found handling. config BUSYBOX_ASH_JOB_CONTROL bool "Job control" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_ALIAS bool "Alias support" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_RANDOM_SUPPORT bool "Pseudorandom generator and $RANDOM variable" default y depends on BUSYBOX_SHELL_ASH help Enable pseudorandom generator and dynamic variable "$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 BUSYBOX_ASH_EXPAND_PRMT bool "Expand prompt string" default y depends on BUSYBOX_SHELL_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 BUSYBOX_ASH_IDLE_TIMEOUT bool "Idle timeout variable $TMOUT" default y depends on BUSYBOX_SHELL_ASH help Enable bash-like auto-logout after $TMOUT seconds of idle time. config BUSYBOX_ASH_MAIL bool "Check for new mail in interactive shell" default y depends on BUSYBOX_SHELL_ASH help Enable "check for new mail" function: if set, $MAIL file and $MAILPATH list of files are checked for mtime changes, and "you have mail" message is printed if change is detected. config BUSYBOX_ASH_ECHO bool "echo builtin" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_PRINTF bool "printf builtin" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_TEST bool "test builtin" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_HELP bool "help builtin" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_GETOPTS bool "getopts builtin" default y depends on BUSYBOX_SHELL_ASH config BUSYBOX_ASH_CMDCMD bool "command builtin" default y depends on BUSYBOX_SHELL_ASH help Enable support for the 'command' builtin, which allows you to run the specified command or builtin, even when there is a function with the same name. endif # ash options config BUSYBOX_CTTYHACK bool "cttyhack (2.4 kb)" default y help One common problem reported on the mailing list is the "can't access tty; job control turned off" error message, which typically appears when one tries to use a shell with stdin/stdout on /dev/console. This device is special - it cannot be a controlling tty. The proper solution is to use the correct device instead of /dev/console. cttyhack provides a "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). On Linux it also checks sysfs for a pointer to the active console. If cttyhack is able to find the real console device, it closes stdin/out/err and reopens that device. Then it executes the 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 Starting an interactive shell from boot shell script: setsid cttyhack sh Giving controlling tty to shell running with PID 1: # exec cttyhack sh Without cttyhack, you need to know exact tty name, and do something like this: # exec setsid sh -c 'exec sh /dev/tty1 2>&1' Starting getty on a controlling tty from a shell script: # getty 115200 $(cttyhack) config BUSYBOX_HUSH bool "hush (68 kb)" default y select BUSYBOX_SHELL_HUSH help hush is a small shell. 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, $((arithmetic)) and functions are supported. It will compile and work on no-mmu systems. It does not handle select, aliases, tilde expansion, &>file and >&file redirection of stdout+stderr. config BUSYBOX_SHELL_HUSH bool "Internal shell for embedded script support" default n # hush options # It's only needed to get "nice" menuconfig indenting. if BUSYBOX_SHELL_HUSH || BUSYBOX_HUSH || BUSYBOX_SH_IS_HUSH || BUSYBOX_BASH_IS_HUSH config BUSYBOX_HUSH_BASH_COMPAT bool "bash-compatible extensions" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_BRACE_EXPANSION bool "Brace expansion" default y depends on BUSYBOX_HUSH_BASH_COMPAT help Enable {abc,def} extension. config BUSYBOX_HUSH_LINENO_VAR bool "$LINENO variable" default y depends on BUSYBOX_HUSH_BASH_COMPAT config BUSYBOX_HUSH_BASH_SOURCE_CURDIR bool "'source' and '.' builtins search current directory after $PATH" default n # do not encourage non-standard behavior depends on BUSYBOX_HUSH_BASH_COMPAT help This is not compliant with standards. Avoid if possible. config BUSYBOX_HUSH_INTERACTIVE bool "Interactive mode" default y depends on BUSYBOX_SHELL_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 BUSYBOX_HUSH_SAVEHISTORY bool "Save command history to .hush_history" default y depends on BUSYBOX_HUSH_INTERACTIVE && BUSYBOX_FEATURE_EDITING_SAVEHISTORY config BUSYBOX_HUSH_JOB bool "Job control" default y depends on BUSYBOX_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 BUSYBOX_HUSH_TICK bool "Support command substitution" default y depends on BUSYBOX_SHELL_HUSH help Enable `command` and $(command). config BUSYBOX_HUSH_IF bool "Support if/then/elif/else/fi" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_LOOPS bool "Support for, while and until loops" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_CASE bool "Support case ... esac statement" default y depends on BUSYBOX_SHELL_HUSH help Enable case ... esac statement. +400 bytes. config BUSYBOX_HUSH_FUNCTIONS bool "Support funcname() { commands; } syntax" default y depends on BUSYBOX_SHELL_HUSH help Enable support for shell functions. +800 bytes. config BUSYBOX_HUSH_LOCAL bool "local builtin" default y depends on BUSYBOX_HUSH_FUNCTIONS help Enable support for local variables in functions. config BUSYBOX_HUSH_RANDOM_SUPPORT bool "Pseudorandom generator and $RANDOM variable" default y depends on BUSYBOX_SHELL_HUSH help Enable pseudorandom generator and dynamic variable "$RANDOM". Each read of "$RANDOM" will generate a new pseudorandom value. config BUSYBOX_HUSH_MODE_X bool "Support 'hush -x' option and 'set -x' command" default y depends on BUSYBOX_SHELL_HUSH help This instructs hush to print commands before execution. Adds ~300 bytes. config BUSYBOX_HUSH_ECHO bool "echo builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_PRINTF bool "printf builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_TEST bool "test builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_HELP bool "help builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_EXPORT bool "export builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_EXPORT_N bool "Support 'export -n' option" default y depends on BUSYBOX_HUSH_EXPORT help export -n unexports variables. It is a bash extension. config BUSYBOX_HUSH_READONLY bool "readonly builtin" default y depends on BUSYBOX_SHELL_HUSH help Enable support for read-only variables. config BUSYBOX_HUSH_KILL bool "kill builtin (supports kill %jobspec)" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_WAIT bool "wait builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_COMMAND bool "command builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_TRAP bool "trap builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_TYPE bool "type builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_TIMES bool "times builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_READ bool "read builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_SET bool "set builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_UNSET bool "unset builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_ULIMIT bool "ulimit builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_UMASK bool "umask builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_GETOPTS bool "getopts builtin" default y depends on BUSYBOX_SHELL_HUSH config BUSYBOX_HUSH_MEMLEAK bool "memleak builtin (debugging)" default n depends on BUSYBOX_SHELL_HUSH endif # hush options comment "Options common to all shells" if BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH config BUSYBOX_FEATURE_SH_MATH bool "POSIX math support" default y depends on BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH help Enable math support in the shell via $((...)) syntax. config BUSYBOX_FEATURE_SH_MATH_64 bool "Extend POSIX math support to 64 bit" default y depends on BUSYBOX_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. This is not in POSIX, so do not rely on this in portable code. config BUSYBOX_FEATURE_SH_MATH_BASE bool "Support BASE#nnnn literals" default y depends on BUSYBOX_FEATURE_SH_MATH config BUSYBOX_FEATURE_SH_EXTRA_QUIET bool "Hide message on interactive shell startup" default y depends on BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH help Remove the busybox introduction when starting a shell. config BUSYBOX_FEATURE_SH_STANDALONE bool "Standalone shell" default n depends on BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH help This option causes busybox shells to use busybox applets in preference to executables in the PATH whenever possible. For example, entering the command 'ifconfig' into the shell would cause busybox to use the ifconfig busybox applet. Specifying the fully qualified executable name, such as '/sbin/ifconfig' will still execute the /sbin/ifconfig executable on the filesystem. This option is generally used when creating a statically linked version of busybox for use as a rescue shell, in the event that you screw up your system. This is implemented by re-execing /proc/self/exe (typically) with right parameters. However, there are drawbacks: it is problematic in chroot jails without mounted /proc, and ps/top may show command name as 'exe' for applets started this way. config BUSYBOX_FEATURE_SH_NOFORK bool "Run 'nofork' applets directly" default n depends on BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH help This option causes busybox shells to not execute typical fork/exec/wait sequence, but call _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 NOFORK in include/applets.h). This may significantly speed up some shell scripts. This feature is relatively new. Use with care. Report bugs to project mailing list. config BUSYBOX_FEATURE_SH_READ_FRAC bool "read -t N.NNN support (+110 bytes)" default y depends on BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH help Enable support for fractional second timeout in read builtin. config BUSYBOX_FEATURE_SH_HISTFILESIZE bool "Use $HISTFILESIZE" default y depends on BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH help 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. config BUSYBOX_FEATURE_SH_EMBEDDED_SCRIPTS bool "Embed scripts in the binary" default y depends on BUSYBOX_SHELL_ASH || BUSYBOX_SHELL_HUSH help Allow scripts to be compressed and embedded in the busybox binary. The scripts should be placed in the 'embed' directory at build time. Like applets, scripts can be run as 'busybox SCRIPT ...' or by linking their name to the binary. This also allows applets to be implemented as scripts: place the script in 'applets_sh' and a stub C file containing configuration in the appropriate subsystem directory. endif # Options common to all shells endmenu