path: root/shell/Config.src (plain)
blob: 7f5f6705078787e4deeebac7b188457bc3146bf3

1	#
2	# For a description of the syntax of this configuration file,
3	# see scripts/kbuild/config-language.txt.
4	#
5
6	menu "Shells"
7
8
9	choice
10	prompt "Choose which shell is aliased to 'sh' name"
11	default SH_IS_ASH
12	help
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.
15
16	# note: cannot use "select ASH" here, it breaks "make allnoconfig"
17	config SH_IS_ASH
18	depends on !NOMMU
19	bool "ash"
20
21	config SH_IS_HUSH
22	bool "hush"
23
24	config SH_IS_NONE
25	bool "none"
26
27	endchoice
28
29	choice
30	prompt "Choose which shell is aliased to 'bash' name"
31	default BASH_IS_NONE
32	help
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.
35
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
39	#!/bin/bash line.
40
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.
45
46	config BASH_IS_ASH
47	depends on !NOMMU
48	bool "ash"
49
50	config BASH_IS_HUSH
51	bool "hush"
52
53	config BASH_IS_NONE
54	bool "none"
55
56	endchoice
57
58
59	INSERT
60
61
62	config FEATURE_SH_MATH
63	bool "POSIX math support"
64	default y
65	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
66	help
67	Enable math support in the shell via $((...)) syntax.
68
69	config FEATURE_SH_MATH_64
70	bool "Extend POSIX math support to 64 bit"
71	default y
72	depends on FEATURE_SH_MATH
73	help
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.
77
78	config FEATURE_SH_EXTRA_QUIET
79	bool "Hide message on interactive shell startup"
80	default y
81	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
82	help
83	Remove the busybox introduction when starting a shell.
84
85	config FEATURE_SH_STANDALONE
86	bool "Standalone shell"
87	default n
88	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
89	help
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.
98
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.
103
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
106	started this way).
107	# untrue?
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.
112	# untrue?
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
116	# all.
117
118	config FEATURE_SH_NOFORK
119	bool "Run 'nofork' applets directly"
120	default n
121	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
122	help
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).
127
128	This will be done only for some applets (those which are marked
129	NOFORK in include/applets.h).
130
131	This may significantly speed up some shell scripts.
132
133	This feature is relatively new. Use with care. Report bugs
134	to project mailing list.
135
136	config FEATURE_SH_HISTFILESIZE
137	bool "Use $HISTFILESIZE"
138	default y
139	depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
140	help
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.
144
145
146	endmenu
147