72089cf6b4
Those two spaces after tab have no effect, and always a nuisance when editing. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
167 lines
5.1 KiB
Plaintext
167 lines
5.1 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see scripts/kbuild/config-language.txt.
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#
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menu "Shells"
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choice
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prompt "Choose which shell is aliased to 'sh' name"
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default SH_IS_ASH
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help
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Choose which shell you want to be executed by 'sh' alias.
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The ash shell is the most bash compatible and full featured one.
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# note: cannot use "select ASH" here, it breaks "make allnoconfig"
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config SH_IS_ASH
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depends on !NOMMU
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bool "ash"
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help
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Choose ash to be the shell executed by 'sh' name.
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The ash code will be built into busybox. If you don't select
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"ash" choice (CONFIG_ASH), this shell may only be invoked by
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the name 'sh' (and not 'ash').
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config SH_IS_HUSH
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bool "hush"
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help
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Choose hush to be the shell executed by 'sh' name.
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The hush code will be built into busybox. If you don't select
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"hush" choice (CONFIG_HUSH), this shell may only be invoked by
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the name 'sh' (and not 'hush').
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config SH_IS_NONE
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bool "none"
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endchoice
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choice
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prompt "Choose which shell is aliased to 'bash' name"
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default BASH_IS_NONE
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help
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Choose which shell you want to be executed by 'bash' alias.
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The ash shell is the most bash compatible and full featured one,
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although compatibility is far from being complete.
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Note that selecting this option does not switch on any bash
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compatibility code. It merely makes it possible to install
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/bin/bash (sym)link and run scripts which start with
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#!/bin/bash line.
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Many systems use it in scripts which use bash-specific features,
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even simple ones like $RANDOM. Without this option, busybox
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can't be used for running them because it won't recongnize
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"bash" as a supported applet name.
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config BASH_IS_ASH
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depends on !NOMMU
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bool "ash"
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help
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Choose ash to be the shell executed by 'bash' name.
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The ash code will be built into busybox. If you don't select
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"ash" choice (CONFIG_ASH), this shell may only be invoked by
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the name 'bash' (and not 'ash').
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config BASH_IS_HUSH
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bool "hush"
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help
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Choose hush to be the shell executed by 'bash' name.
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The hush code will be built into busybox. If you don't select
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"hush" choice (CONFIG_HUSH), this shell may only be invoked by
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the name 'bash' (and not 'hush').
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config BASH_IS_NONE
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bool "none"
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endchoice
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INSERT
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comment "Options common to all shells"
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if ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
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config FEATURE_SH_MATH
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bool "POSIX math support"
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default y
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depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
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help
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Enable math support in the shell via $((...)) syntax.
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config FEATURE_SH_MATH_64
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bool "Extend POSIX math support to 64 bit"
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default y
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depends on FEATURE_SH_MATH
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help
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Enable 64-bit math support in the shell. This will make the shell
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slightly larger, but will allow computation with very large numbers.
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This is not in POSIX, so do not rely on this in portable code.
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config FEATURE_SH_EXTRA_QUIET
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bool "Hide message on interactive shell startup"
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default y
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depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
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help
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Remove the busybox introduction when starting a shell.
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config FEATURE_SH_STANDALONE
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bool "Standalone shell"
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default n
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depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
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help
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This option causes busybox shells to use busybox applets
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in preference to executables in the PATH whenever possible. For
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example, entering the command 'ifconfig' into the shell would cause
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busybox to use the ifconfig busybox applet. Specifying the fully
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qualified executable name, such as '/sbin/ifconfig' will still
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execute the /sbin/ifconfig executable on the filesystem. This option
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is generally used when creating a statically linked version of busybox
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for use as a rescue shell, in the event that you screw up your system.
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This is implemented by re-execing /proc/self/exe (typically)
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with right parameters.
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However, there are drawbacks: it is problematic in chroot jails
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without mounted /proc, and ps/top may show command name as 'exe'
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for applets started this way.
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config FEATURE_SH_NOFORK
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bool "Run 'nofork' applets directly"
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default n
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depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
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help
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This option causes busybox shells to not execute typical
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fork/exec/wait sequence, but call <applet>_main directly,
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if possible. (Sometimes it is not possible: for example,
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this is not possible in pipes).
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This will be done only for some applets (those which are marked
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NOFORK in include/applets.h).
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This may significantly speed up some shell scripts.
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This feature is relatively new. Use with care. Report bugs
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to project mailing list.
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config FEATURE_SH_READ_FRAC
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bool "read -t N.NNN support (+110 bytes)"
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default y
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depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
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help
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Enable support for fractional second timeout in read builtin.
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config FEATURE_SH_HISTFILESIZE
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bool "Use $HISTFILESIZE"
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default y
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depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
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help
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This option makes busybox shells to use $HISTFILESIZE variable
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to set shell history size. Note that its max value is capped
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by "History size" setting in library tuning section.
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endif # Options common to all shells
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endmenu
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