2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
10 prompt "Choose which shell is aliased to 'sh' name"
13 Choose which shell you want to be executed by 'sh' alias.
14 The ash shell is the most bash compatible and full featured one.
16 # note: cannot use "select ASH" here, it breaks "make allnoconfig"
21 Choose ash to be the shell executed by 'sh' name.
22 The ash code will be built into busybox. If you don't select
23 "ash" choice (CONFIG_ASH), this shell may only be invoked by
24 the name 'sh' (and not 'ash').
29 Choose hush to be the shell executed by 'sh' name.
30 The hush code will be built into busybox. If you don't select
31 "hush" choice (CONFIG_HUSH), this shell may only be invoked by
32 the name 'sh' (and not 'hush').
40 prompt "Choose which shell is aliased to 'bash' name"
43 Choose which shell you want to be executed by 'bash' alias.
44 The ash shell is the most bash compatible and full featured one,
45 although compatibility is far from being complete.
47 Note that selecting this option does not switch on any bash
48 compatibility code. It merely makes it possible to install
49 /bin/bash (sym)link and run scripts which start with
52 Many systems use it in scripts which use bash-specific features,
53 even simple ones like $RANDOM. Without this option, busybox
54 can't be used for running them because it won't recongnize
55 "bash" as a supported applet name.
61 Choose ash to be the shell executed by 'bash' name.
62 The ash code will be built into busybox. If you don't select
63 "ash" choice (CONFIG_ASH), this shell may only be invoked by
64 the name 'bash' (and not 'ash').
69 Choose hush to be the shell executed by 'bash' name.
70 The hush code will be built into busybox. If you don't select
71 "hush" choice (CONFIG_HUSH), this shell may only be invoked by
72 the name 'bash' (and not 'hush').
83 config FEATURE_SH_MATH
84 bool "POSIX math support"
86 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
88 Enable math support in the shell via $((...)) syntax.
90 config FEATURE_SH_MATH_64
91 bool "Extend POSIX math support to 64 bit"
93 depends on FEATURE_SH_MATH
95 Enable 64-bit math support in the shell. This will make the shell
96 slightly larger, but will allow computation with very large numbers.
97 This is not in POSIX, so do not rely on this in portable code.
99 config FEATURE_SH_EXTRA_QUIET
100 bool "Hide message on interactive shell startup"
102 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
104 Remove the busybox introduction when starting a shell.
106 config FEATURE_SH_STANDALONE
107 bool "Standalone shell"
109 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
111 This option causes busybox shells to use busybox applets
112 in preference to executables in the PATH whenever possible. For
113 example, entering the command 'ifconfig' into the shell would cause
114 busybox to use the ifconfig busybox applet. Specifying the fully
115 qualified executable name, such as '/sbin/ifconfig' will still
116 execute the /sbin/ifconfig executable on the filesystem. This option
117 is generally used when creating a statically linked version of busybox
118 for use as a rescue shell, in the event that you screw up your system.
120 This is implemented by re-execing /proc/self/exe (typically)
121 with right parameters. Some selected applets ("NOFORK" applets)
122 can even be executed without creating new process.
123 Instead, busybox will call <applet>_main() internally.
125 However, this causes problems in chroot jails without mounted /proc
126 and with ps/top (command name can be shown as 'exe' for applets
129 # Note that this will *also* cause applets to take precedence
130 # over shell builtins of the same name. So turning this on will
131 # eliminate any performance gained by turning on the builtin "echo"
132 # and "test" commands in ash.
134 # Note that when using this option, the shell will attempt to directly
135 # run '/bin/busybox'. If you do not have the busybox binary sitting in
136 # that exact location with that exact name, this option will not work at
139 config FEATURE_SH_NOFORK
140 bool "Run 'nofork' applets directly"
142 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
144 This option causes busybox shells to not execute typical
145 fork/exec/wait sequence, but call <applet>_main directly,
146 if possible. (Sometimes it is not possible: for example,
147 this is not possible in pipes).
149 This will be done only for some applets (those which are marked
150 NOFORK in include/applets.h).
152 This may significantly speed up some shell scripts.
154 This feature is relatively new. Use with care. Report bugs
155 to project mailing list.
157 config FEATURE_SH_HISTFILESIZE
158 bool "Use $HISTFILESIZE"
160 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
162 This option makes busybox shells to use $HISTFILESIZE variable
163 to set shell history size. Note that its max value is capped
164 by "History size" setting in library tuning section.