# DO NOT EDIT. This file is generated from Config.src # # For a description of the syntax of this configuration file, # see scripts/kbuild/config-language.txt. # menu "Shells" choice prompt "Choose which shell is aliased to 'sh' name" 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 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 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 SH_IS_NONE bool "none" endchoice choice prompt "Choose which shell is aliased to 'bash' name" 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, 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 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 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 BASH_IS_NONE bool "none" endchoice 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. # ash options # note: Don't remove !NOMMU part in the next line; it would break # menuconfig's indenting. if !NOMMU && (ASH || SH_IS_ASH || BASH_IS_ASH) config ASH_OPTIMIZE_FOR_SIZE bool "Optimize for size instead of speed" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config 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 ASH || SH_IS_ASH || BASH_IS_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 ASH_BASH_COMPAT bool "bash-compatible extensions" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_JOB_CONTROL bool "Job control" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_ALIAS bool "Alias support" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_RANDOM_SUPPORT bool "Pseudorandom generator and $RANDOM variable" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH help Enable pseudorandom generator and dynamic variable "$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 || SH_IS_ASH || BASH_IS_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 ASH_IDLE_TIMEOUT bool "Idle timeout variable $TMOUT" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH help Enable bash-like auto-logout after $TMOUT seconds of idle time. config ASH_MAIL bool "Check for new mail in interactive shell" default y depends on ASH || SH_IS_ASH || BASH_IS_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 ASH_ECHO bool "echo builtin" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_PRINTF bool "printf builtin" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_TEST bool "test builtin" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_HELP bool "help builtin" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_GETOPTS bool "getopts builtin" default y depends on ASH || SH_IS_ASH || BASH_IS_ASH config ASH_CMDCMD bool "command builtin" default y depends on ASH || SH_IS_ASH || BASH_IS_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 CTTYHACK bool "cttyhack" 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 HUSH bool "hush" default y help hush is a small shell (25k). 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 HUSH_BASH_COMPAT bool "bash-compatible extensions" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_BRACE_EXPANSION bool "Brace expansion" default y depends on HUSH_BASH_COMPAT help Enable {abc,def} extension. config HUSH_INTERACTIVE bool "Interactive mode" default y depends on HUSH || SH_IS_HUSH || BASH_IS_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_SAVEHISTORY bool "Save command history to .hush_history" default y depends on HUSH_INTERACTIVE && FEATURE_EDITING_SAVEHISTORY 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 "Support process substitution" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH help Enable `command` and $(command). config HUSH_IF bool "Support if/then/elif/else/fi" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_LOOPS bool "Support for, while and until loops" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_CASE bool "Support case ... esac statement" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH help Enable case ... esac statement. +400 bytes. config HUSH_FUNCTIONS bool "Support funcname() { commands; } syntax" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH help Enable support for shell functions. +800 bytes. config HUSH_LOCAL bool "local builtin" default y depends on HUSH_FUNCTIONS help Enable support for local variables in functions. config HUSH_RANDOM_SUPPORT bool "Pseudorandom generator and $RANDOM variable" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH help Enable pseudorandom generator and dynamic variable "$RANDOM". Each read of "$RANDOM" will generate a new pseudorandom value. config HUSH_MODE_X bool "Support 'hush -x' option and 'set -x' command" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH help This instructs hush to print commands before execution. Adds ~300 bytes. config HUSH_ECHO bool "echo builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_PRINTF bool "printf builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_TEST bool "test builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_HELP bool "help builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_EXPORT bool "export builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_EXPORT_N bool "Support 'export -n' option" default y depends on HUSH_EXPORT help export -n unexports variables. It is a bash extension. config HUSH_KILL bool "kill builtin (supports kill %jobspec)" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_WAIT bool "wait builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_TRAP bool "trap builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_TYPE bool "type builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_READ bool "read builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_SET bool "set builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_UNSET bool "unset builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_ULIMIT bool "ulimit builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_UMASK bool "umask builtin" default y depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config HUSH_MEMLEAK bool "memleak builtin (debugging)" default n depends on HUSH || SH_IS_HUSH || BASH_IS_HUSH config MSH bool "msh (deprecated: aliased to hush)" default n select HUSH help msh is deprecated and will be removed, please migrate to hush. comment "Options common to all shells" if ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH config FEATURE_SH_MATH bool "POSIX math support" default y 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 FEATURE_SH_MATH_64 bool "Extend POSIX math support to 64 bit" default y 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. This is not in POSIX, so do not rely on this in portable code. config FEATURE_SH_EXTRA_QUIET bool "Hide message on interactive shell startup" default y 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 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 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 FEATURE_SH_NOFORK bool "Run 'nofork' applets directly" default n depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_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 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 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. endif # Options common to all shells endmenu