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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
|
#
# For a description of the syntax of this configuration file,
# see scripts/kbuild/config-language.txt.
#
menu "Shells"
choice
prompt "Choose your default shell"
default FEATURE_SH_IS_NONE
help
Choose a shell. The ash shell is the most bash compatible
and full featured one.
config FEATURE_SH_IS_ASH
select ASH
bool "ash"
config FEATURE_SH_IS_HUSH
select HUSH
bool "hush"
config FEATURE_SH_IS_LASH
select LASH
bool "lash"
config FEATURE_SH_IS_MSH
select MSH
bool "msh"
config FEATURE_SH_IS_NONE
bool "none"
endchoice
config ASH
bool "ash"
default n
select TEST
help
Tha 'ash' shell adds about 60k in the default configuration and is
the most complete and most pedantically correct shell included with
busybox. This shell is actually a derivative of the Debian 'dash'
shell (by Herbert Xu), which was created by porting the 'ash' shell
(written by Kenneth Almquist) from NetBSD.
comment "Ash Shell Options"
depends on ASH
config ASH_JOB_CONTROL
bool "Job control"
default y
depends on ASH
help
Enable job control in the ash shell.
config ASH_READ_NCHARS
bool "'read -n N' and 'read -s' support"
default n
depends on ASH
help
'read -n N' will return a value after N characters have been read.
'read -s' will read without echoing the user's input.
config ASH_READ_TIMEOUT
bool "'read -t S' support."
default n
depends on ASH
help
'read -t S' will return a value after S seconds have passed.
This implementation will allow fractional seconds, expressed
as a decimal fraction, e.g. 'read -t 2.5 foo'.
config ASH_ALIAS
bool "alias support"
default y
depends on ASH
help
Enable alias support in the ash shell.
config ASH_MATH_SUPPORT
bool "Posix math support"
default y
depends on ASH
help
Enable math support in the ash shell.
config ASH_MATH_SUPPORT_64
bool "Extend Posix math support to 64 bit"
default n
depends on ASH_MATH_SUPPORT
help
Enable 64-bit math support in the ash shell. This will make
the shell slightly larger, but will allow computation with very
large numbers.
config ASH_GETOPTS
bool "Builtin getopt to parse positional parameters"
default n
depends on ASH
help
Enable getopts builtin in the ash shell.
config ASH_BUILTIN_ECHO
bool "Builtin version of 'echo'"
default y
select ECHO
depends on ASH
help
Enable support for echo, built in to ash.
config ASH_BUILTIN_TEST
bool "Builtin version of 'test'"
default y
select TEST
depends on ASH
help
Enable support for test, built in to ash.
config ASH_CMDCMD
bool "'command' command to override shell builtins"
default n
depends on ASH
help
Enable support for the ash 'command' builtin, which allows
you to run the specified command with the specified arguments,
even when there is an ash builtin command with the same name.
config ASH_MAIL
bool "Check for new mail on interactive shells"
default y
depends on ASH
help
Enable "check for new mail" in the ash shell.
config ASH_OPTIMIZE_FOR_SIZE
bool "Optimize for size instead of speed"
default y
depends on ASH
help
Compile ash for reduced size at the price of speed.
config ASH_RANDOM_SUPPORT
bool "Pseudorandom generator and variable $RANDOM"
default n
depends on ASH
help
Enable pseudorandom generator and dynamic variable "$RANDOM".
Each read of "$RANDOM" will generate a new pseudorandom value.
You can reset the generator by using a specified start value.
After "unset RANDOM" then generator will switch off and this
variable will no longer have special treatment.
config ASH_EXPAND_PRMT
bool "Expand prompt string"
default n
depends on ASH
help
"PS#" may be contain volatile content, such as backquote commands.
This option recreates the prompt string from the environment
variable each time it is displayed.
config HUSH
bool "hush"
default n
select TRUE
select FALSE
select TEST
help
hush is a very small shell (just 18k) and it has fairly complete
Bourne shell grammar. It even handles all the normal flow control
options such as if/then/elif/else/fi, for/in/do/done, while loops,
etc.
It does not handle case/esac, select, function, here documents ( <<
word ), arithmetic expansion, aliases, brace expansion, tilde
expansion, &> and >& redirection of stdout+stderr, etc.
config LASH
bool "lash"
default n
select TRUE
select FALSE
select TEST
help
lash is the very smallest shell (adds just 10k) and it is quite
usable as a command prompt, but it is not suitable for any but the
most trivial scripting (such as an initrd that calls insmod a few
times) since it does not understand any Bourne shell grammar. It
does handle pipes, redirects, and job control though. Adding in
command editing makes it a very nice lightweight command prompt.
config MSH
bool "msh"
default n
select TRUE
select FALSE
select TEST
help
The minix shell (adds just 30k) is quite complete and handles things
like for/do/done, case/esac and all the things you expect a Bourne
shell to do. It is not always pedantically correct about Bourne
shell grammar (try running the shell testscript "tests/sh.testcases"
on it and compare vs bash) but for most things it works quite well.
It also uses only vfork, so it can be used on uClinux systems.
comment "Bourne Shell Options"
depends on MSH || LASH || HUSH || ASH
config FEATURE_SH_EXTRA_QUIET
bool "Hide message on interactive shell startup"
default n
depends on MSH || LASH || HUSH || ASH
help
Remove the busybox introduction when starting a shell.
config FEATURE_SH_STANDALONE_SHELL
bool "Standalone shell"
default n
depends on MSH || LASH || HUSH || ASH
help
This option causes the selected busybox shell 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.
Note that this will *also* cause applets to take precedence
over shell builtins of the same name. So turning this on will
eliminate any performance gained by turning on the builtin "echo"
and "test" commands in ash.
Note that when using this option, the shell will attempt to directly
run '/bin/busybox'. If you do not have the busybox binary sitting in
that exact location with that exact name, this option will not work at
all.
config FEATURE_COMMAND_EDITING
bool "Command line editing"
default n
depends on MSH || LASH || HUSH || ASH
help
Enable command editing in shell.
config FEATURE_COMMAND_EDITING_VI
bool "vi-style line editing commands"
default n
depends on FEATURE_COMMAND_EDITING
help
Enable vi-style line editing in the shell. This mode can be
turned on and off with "set -o vi" and "set +o vi".
config FEATURE_COMMAND_HISTORY
int "History size"
range 0 99999
default 15
depends on FEATURE_COMMAND_EDITING
help
Specify command history size in shell.
config FEATURE_COMMAND_SAVEHISTORY
bool "History saving"
default n
depends on ASH && FEATURE_COMMAND_EDITING
help
Enable history saving in ash shell.
config FEATURE_COMMAND_TAB_COMPLETION
bool "Tab completion"
default n
depends on FEATURE_COMMAND_EDITING
help
Enable tab completion in shell.
config FEATURE_COMMAND_USERNAME_COMPLETION
bool "Username completion"
default n
depends on FEATURE_COMMAND_TAB_COMPLETION
help
Enable username completion in shell.
config FEATURE_SH_FANCY_PROMPT
bool "Fancy shell prompts"
default n
depends on FEATURE_COMMAND_EDITING
help
Setting this option allows for prompts to use things like \w and
\$ and also using escape codes.
endmenu
|
