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"
30 prompt "Choose which shell is aliased to 'bash' name"
33 Choose which shell you want to be executed by 'bash' alias.
34 The ash shell is the most bash compatible and full featured one.
36 Note that selecting this option does not switch on any bash
37 compatibility code. It merely makes it possible to install
38 /bin/bash (sym)link and run scripts which start with
41 Many systems use it in scripts which use bash-specific features,
42 even simple ones like $RANDOM. Without this option, busybox
43 can't be used for running them because it won't recongnize
44 "bash" as a supported applet name.
62 config FEATURE_SH_MATH
63 bool "POSIX math support"
65 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
67 Enable math support in the shell via $((...)) syntax.
69 config FEATURE_SH_MATH_64
70 bool "Extend POSIX math support to 64 bit"
72 depends on FEATURE_SH_MATH
74 Enable 64-bit math support in the shell. This will make the shell
75 slightly larger, but will allow computation with very large numbers.
76 This is not in POSIX, so do not rely on this in portable code.
78 config FEATURE_SH_EXTRA_QUIET
79 bool "Hide message on interactive shell startup"
81 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
83 Remove the busybox introduction when starting a shell.
85 config FEATURE_SH_STANDALONE
86 bool "Standalone shell"
88 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
90 This option causes busybox shells to use busybox applets
91 in preference to executables in the PATH whenever possible. For
92 example, entering the command 'ifconfig' into the shell would cause
93 busybox to use the ifconfig busybox applet. Specifying the fully
94 qualified executable name, such as '/sbin/ifconfig' will still
95 execute the /sbin/ifconfig executable on the filesystem. This option
96 is generally used when creating a statically linked version of busybox
97 for use as a rescue shell, in the event that you screw up your system.
99 This is implemented by re-execing /proc/self/exe (typically)
100 with right parameters. Some selected applets ("NOFORK" applets)
101 can even be executed without creating new process.
102 Instead, busybox will call <applet>_main() internally.
104 However, this causes problems in chroot jails without mounted /proc
105 and with ps/top (command name can be shown as 'exe' for applets
108 # Note that this will *also* cause applets to take precedence
109 # over shell builtins of the same name. So turning this on will
110 # eliminate any performance gained by turning on the builtin "echo"
111 # and "test" commands in ash.
113 # Note that when using this option, the shell will attempt to directly
114 # run '/bin/busybox'. If you do not have the busybox binary sitting in
115 # that exact location with that exact name, this option will not work at
118 config FEATURE_SH_NOFORK
119 bool "Run 'nofork' applets directly"
121 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
123 This option causes busybox shells to not execute typical
124 fork/exec/wait sequence, but call <applet>_main directly,
125 if possible. (Sometimes it is not possible: for example,
126 this is not possible in pipes).
128 This will be done only for some applets (those which are marked
129 NOFORK in include/applets.h).
131 This may significantly speed up some shell scripts.
133 This feature is relatively new. Use with care. Report bugs
134 to project mailing list.
136 config FEATURE_SH_HISTFILESIZE
137 bool "Use $HISTFILESIZE"
139 depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
141 This option makes busybox shells to use $HISTFILESIZE variable
142 to set shell history size. Note that its max value is capped
143 by "History size" setting in library tuning section.