2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 menu "Another Bourne-like Shell"
9 prompt "Choose your default shell"
10 default CONFIG_FEATURE_SH_IS_NONE
12 Choose a shell. The ash shell is the most bash compatible
13 and full featured one.
15 config CONFIG_FEATURE_SH_IS_ASH
19 config CONFIG_FEATURE_SH_IS_HUSH
23 config CONFIG_FEATURE_SH_IS_LASH
27 config CONFIG_FEATURE_SH_IS_MSH
31 config CONFIG_FEATURE_SH_IS_NONE
40 Tha 'ash' shell adds about 60k in the default configuration and is
41 the most complete and most pedantically correct shell included with
42 busybox. This shell is actually a derivative of the Debian 'dash'
43 shell (by Herbert Xu), which was created by porting the 'ash' shell
44 (written by Kenneth Almquist) from NetBSD.
46 comment "Ash Shell Options"
49 config CONFIG_ASH_JOB_CONTROL
50 bool " Enable Job control"
54 Enable job control in the ash shell.
56 config CONFIG_ASH_ALIAS
57 bool " Enable alias support"
61 Enable alias support in the ash shell.
63 config CONFIG_ASH_MATH_SUPPORT
64 bool " Enable Posix math support"
68 Enable math support in the ash shell.
70 config CONFIG_ASH_MATH_SUPPORT_64
71 bool " Extend Posix math support to 64 bit"
73 depends on CONFIG_ASH_MATH_SUPPORT
75 Enable 64-bit math support in the ash shell. This will make
76 the shell slightly larger, but will allow computation with very
79 config CONFIG_ASH_GETOPTS
80 bool " Enable getopts builtin to parse positional parameters"
84 Enable getopts builtin in the ash shell.
86 config CONFIG_ASH_CMDCMD
87 bool " Enable cmdcmd to override shell builtins"
91 Enable support for the ash 'command' builtin, which allows
92 you to run the specified command with the specified arguments,
93 even when there is an ash builtin command with the same name.
95 config CONFIG_ASH_MAIL
96 bool " Check for new mail on interactive shells"
100 Enable "check for new mail" in the ash shell.
102 config CONFIG_ASH_OPTIMIZE_FOR_SIZE
103 bool " Optimize for size instead of speed"
105 depends on CONFIG_ASH
107 Compile ash for reduced size at price of speed.
109 config CONFIG_ASH_RANDOM_SUPPORT
110 bool " Enable pseudorandom generator and variable $RANDOM"
112 depends on CONFIG_ASH
114 Enable pseudorandom generator and dynamic variable "$RANDOM".
115 Each read of "$RANDOM" will generate a new pseudorandom value.
116 You can reset the generator by using a specified start value.
117 After "unset RANDOM" then generator will switch off and this
118 variable will no longer have special treatment.
124 hush is a very small shell (just 18k) and it has fairly complete
125 Bourne shell grammar. It even handles all the normal flow control
126 options such as if/then/elif/else/fi, for/in/do/done, while loops,
129 It does not handle case/esac, select, function, here documents ( <<
130 word ), arithmetic expansion, aliases, brace expansion, tilde
131 expansion, &> and >& redirection of stdout+stderr, etc.
138 lash is the very smallest shell (adds just 10k) and it is quite
139 usable as a command prompt, but it is not suitable for any but the
140 most trivial scripting (such as an initrd that calls insmod a few
141 times) since it does not understand any Bourne shell grammar. It
142 does handle pipes, redirects, and job control though. Adding in
143 command editing makes it a very nice lightweight command prompt.
150 The minix shell (adds just 30k) is quite complete and handles things
151 like for/do/done, case/esac and all the things you expect a Bourne
152 shell to do. It is not always pedantically correct about Bourne
153 shell grammar (try running the shell testscript "tests/sh.testcases"
154 on it and compare vs bash) but for most things it works quite well.
155 It also uses only vfork, so it can be used on uClinux systems.
157 comment "Bourne Shell Options"
158 depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
160 config CONFIG_FEATURE_SH_EXTRA_QUIET
161 bool "Hide message on interactive shell startup"
163 depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
165 Remove the busybox introduction when starting a shell.
167 config CONFIG_FEATURE_SH_STANDALONE_SHELL
168 bool "Standalone shell"
170 depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
172 This option causes the selected busybox shell to use busybox applets
173 in preference to executables in the PATH whenever possible. For
174 example, entering the command 'ifconfig' into the shell would cause
175 busybox to use the ifconfig busybox applet. Specifying the fully
176 qualified executable name, such as '/sbin/ifconfig' will still
177 execute the /sbin/ifconfig executable on the filesystem. This option
178 is generally used when creating a staticly linked version of busybox
179 for use as a rescue shell, in the event that you screw up your system.
181 Note that when using this option, the shell will attempt to directly
182 run '/bin/busybox'. If you do not have the busybox binary sitting in
183 that exact location with that exact name, this option will not work at
186 config CONFIG_FEATURE_COMMAND_EDITING
187 bool "command line editing"
189 depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
191 Enable command editing in shell.
193 config CONFIG_FEATURE_COMMAND_HISTORY
196 depends on CONFIG_FEATURE_COMMAND_EDITING
198 Specify command history size in shell.
200 config CONFIG_FEATURE_COMMAND_SAVEHISTORY
201 bool "history saving"
203 depends on CONFIG_ASH && CONFIG_FEATURE_COMMAND_EDITING
205 Enable history saving in ash shell.
207 config CONFIG_FEATURE_COMMAND_TAB_COMPLETION
208 bool "tab completion"
210 depends on CONFIG_FEATURE_COMMAND_EDITING
212 Enable tab completion in shell.
214 config CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
215 bool "username completion"
217 depends on CONFIG_FEATURE_COMMAND_TAB_COMPLETION
219 Enable username completion in shell.
221 config CONFIG_FEATURE_SH_FANCY_PROMPT
222 bool "Fancy shell prompts"
224 depends on CONFIG_FEATURE_COMMAND_EDITING
226 Setting this option allows for prompts to use things like \w and
227 \$ and also using escape codes.