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 comment "Options common to all shells"
84 if ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
86 config FEATURE_SH_MATH
87 bool "POSIX math support"
89 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
91 Enable math support in the shell via $((...)) syntax.
93 config FEATURE_SH_MATH_64
94 bool "Extend POSIX math support to 64 bit"
96 depends on FEATURE_SH_MATH
98 Enable 64-bit math support in the shell. This will make the shell
99 slightly larger, but will allow computation with very large numbers.
100 This is not in POSIX, so do not rely on this in portable code.
102 config FEATURE_SH_EXTRA_QUIET
103 bool "Hide message on interactive shell startup"
105 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
107 Remove the busybox introduction when starting a shell.
109 config FEATURE_SH_STANDALONE
110 bool "Standalone shell"
112 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
114 This option causes busybox shells to use busybox applets
115 in preference to executables in the PATH whenever possible. For
116 example, entering the command 'ifconfig' into the shell would cause
117 busybox to use the ifconfig busybox applet. Specifying the fully
118 qualified executable name, such as '/sbin/ifconfig' will still
119 execute the /sbin/ifconfig executable on the filesystem. This option
120 is generally used when creating a statically linked version of busybox
121 for use as a rescue shell, in the event that you screw up your system.
123 This is implemented by re-execing /proc/self/exe (typically)
124 with right parameters.
126 However, there are drawbacks: it is problematic in chroot jails
127 without mounted /proc, and ps/top may show command name as 'exe'
128 for applets started this way.
130 config FEATURE_SH_NOFORK
131 bool "Run 'nofork' applets directly"
133 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
135 This option causes busybox shells to not execute typical
136 fork/exec/wait sequence, but call <applet>_main directly,
137 if possible. (Sometimes it is not possible: for example,
138 this is not possible in pipes).
140 This will be done only for some applets (those which are marked
141 NOFORK in include/applets.h).
143 This may significantly speed up some shell scripts.
145 This feature is relatively new. Use with care. Report bugs
146 to project mailing list.
148 config FEATURE_SH_READ_FRAC
149 bool "read -t N.NNN support (+110 bytes)"
151 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
153 Enable support for fractional second timeout in read builtin.
155 config FEATURE_SH_HISTFILESIZE
156 bool "Use $HISTFILESIZE"
158 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
160 This option makes busybox shells to use $HISTFILESIZE variable
161 to set shell history size. Note that its max value is capped
162 by "History size" setting in library tuning section.
164 endif # Options common to all shells