1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#
menu "Shells"
choice
prompt "Choose which shell is aliased to 'sh' name"
default SH_IS_ASH
help
Choose which shell you want to be executed by 'sh' alias.
The ash shell is the most bash compatible and full featured one.
# note: cannot use "select ASH" here, it breaks "make allnoconfig"
config SH_IS_ASH
depends on !NOMMU
bool "ash"
help
Choose ash to be the shell executed by 'sh' name.
The ash code will be built into busybox. If you don't select
"ash" choice (CONFIG_ASH), this shell may only be invoked by
the name 'sh' (and not 'ash').
config SH_IS_HUSH
bool "hush"
help
Choose hush to be the shell executed by 'sh' name.
The hush code will be built into busybox. If you don't select
"hush" choice (CONFIG_HUSH), this shell may only be invoked by
the name 'sh' (and not 'hush').
config SH_IS_NONE
bool "none"
endchoice
choice
prompt "Choose which shell is aliased to 'bash' name"
default BASH_IS_NONE
help
Choose which shell you want to be executed by 'bash' alias.
The ash shell is the most bash compatible and full featured one,
although compatibility is far from being complete.
Note that selecting this option does not switch on any bash
compatibility code. It merely makes it possible to install
/bin/bash (sym)link and run scripts which start with
#!/bin/bash line.
Many systems use it in scripts which use bash-specific features,
even simple ones like $RANDOM. Without this option, busybox
can't be used for running them because it won't recongnize
"bash" as a supported applet name.
config BASH_IS_ASH
depends on !NOMMU
bool "ash"
help
Choose ash to be the shell executed by 'bash' name.
The ash code will be built into busybox. If you don't select
"ash" choice (CONFIG_ASH), this shell may only be invoked by
the name 'bash' (and not 'ash').
config BASH_IS_HUSH
bool "hush"
help
Choose hush to be the shell executed by 'bash' name.
The hush code will be built into busybox. If you don't select
"hush" choice (CONFIG_HUSH), this shell may only be invoked by
the name 'bash' (and not 'hush').
config BASH_IS_NONE
bool "none"
endchoice
INSERT
comment "Options common to all shells"
if ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
config FEATURE_SH_MATH
bool "POSIX math support"
default y
depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
Enable math support in the shell via $((...)) syntax.
config FEATURE_SH_MATH_64
bool "Extend POSIX math support to 64 bit"
default y
depends on FEATURE_SH_MATH
help
Enable 64-bit math support in the shell. This will make the shell
slightly larger, but will allow computation with very large numbers.
This is not in POSIX, so do not rely on this in portable code.
config FEATURE_SH_EXTRA_QUIET
bool "Hide message on interactive shell startup"
default y
depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
Remove the busybox introduction when starting a shell.
config FEATURE_SH_STANDALONE
bool "Standalone shell"
default n
depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
This option causes busybox shells to use busybox applets
in preference to executables in the PATH whenever possible. For
example, entering the command 'ifconfig' into the shell would cause
busybox to use the ifconfig busybox applet. Specifying the fully
qualified executable name, such as '/sbin/ifconfig' will still
execute the /sbin/ifconfig executable on the filesystem. This option
is generally used when creating a statically linked version of busybox
for use as a rescue shell, in the event that you screw up your system.
This is implemented by re-execing /proc/self/exe (typically)
with right parameters.
However, there are drawbacks: it is problematic in chroot jails
without mounted /proc, and ps/top may show command name as 'exe'
for applets started this way.
config FEATURE_SH_NOFORK
bool "Run 'nofork' applets directly"
default n
depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
This option causes busybox shells to not execute typical
fork/exec/wait sequence, but call <applet>_main directly,
if possible. (Sometimes it is not possible: for example,
this is not possible in pipes).
This will be done only for some applets (those which are marked
NOFORK in include/applets.h).
This may significantly speed up some shell scripts.
This feature is relatively new. Use with care. Report bugs
to project mailing list.
config FEATURE_SH_READ_FRAC
bool "read -t N.NNN support (+110 bytes)"
default y
depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
Enable support for fractional second timeout in read builtin.
config FEATURE_SH_HISTFILESIZE
bool "Use $HISTFILESIZE"
default y
depends on ASH || HUSH || SH_IS_ASH || BASH_IS_ASH || SH_IS_HUSH || BASH_IS_HUSH
help
This option makes busybox shells to use $HISTFILESIZE variable
to set shell history size. Note that its max value is capped
by "History size" setting in library tuning section.
endif # Options common to all shells
endmenu
|
