1 | #
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2 | # For a description of the syntax of this configuration file,
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3 | # see scripts/kbuild/config-language.txt.
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4 | #
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5 |
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6 | menu "Shells"
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7 |
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8 | choice
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9 | prompt "Choose your default shell"
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10 | default CONFIG_FEATURE_SH_IS_NONE
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11 | help
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12 | Choose a shell. The ash shell is the most bash compatible
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13 | and full featured one.
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14 |
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15 | config CONFIG_FEATURE_SH_IS_ASH
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16 | select CONFIG_ASH
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17 | bool "ash"
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18 |
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19 | config CONFIG_FEATURE_SH_IS_HUSH
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20 | select CONFIG_HUSH
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21 | bool "hush"
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22 |
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23 | config CONFIG_FEATURE_SH_IS_LASH
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24 | select CONFIG_LASH
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25 | bool "lash"
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26 |
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27 | config CONFIG_FEATURE_SH_IS_MSH
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28 | select CONFIG_MSH
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29 | bool "msh"
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30 |
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31 | config CONFIG_FEATURE_SH_IS_NONE
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32 | bool "none"
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33 |
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34 | endchoice
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35 |
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36 | config CONFIG_ASH
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37 | bool "ash"
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38 | default n
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39 | select CONFIG_TEST
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40 | help
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41 | Tha 'ash' shell adds about 60k in the default configuration and is
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42 | the most complete and most pedantically correct shell included with
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43 | busybox. This shell is actually a derivative of the Debian 'dash'
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44 | shell (by Herbert Xu), which was created by porting the 'ash' shell
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45 | (written by Kenneth Almquist) from NetBSD.
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46 |
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47 | comment "Ash Shell Options"
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48 | depends on CONFIG_ASH
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49 |
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50 | config CONFIG_ASH_JOB_CONTROL
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51 | bool "Job control"
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52 | default y
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53 | depends on CONFIG_ASH
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54 | help
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55 | Enable job control in the ash shell.
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56 |
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57 | config CONFIG_ASH_READ_NCHARS
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58 | bool "'read -n N' and 'read -s' support"
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59 | default n
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60 | depends on CONFIG_ASH
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61 | help
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62 | 'read -n N' will return a value after N characters have been read.
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63 | 'read -s' will read without echoing the user's input.
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64 |
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65 | config CONFIG_ASH_READ_TIMEOUT
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66 | bool "'read -t S' support."
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67 | default n
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68 | depends on CONFIG_ASH
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69 | help
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70 | 'read -t S' will return a value after S seconds have passed.
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71 | This implementation will allow fractional seconds, expressed
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72 | as a decimal fraction, e.g. 'read -t 2.5 foo'.
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73 |
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74 | config CONFIG_ASH_ALIAS
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75 | bool "alias support"
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76 | default y
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77 | depends on CONFIG_ASH
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78 | help
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79 | Enable alias support in the ash shell.
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80 |
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81 | config CONFIG_ASH_MATH_SUPPORT
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82 | bool "Posix math support"
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83 | default y
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84 | depends on CONFIG_ASH
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85 | help
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86 | Enable math support in the ash shell.
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87 |
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88 | config CONFIG_ASH_MATH_SUPPORT_64
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89 | bool "Extend Posix math support to 64 bit"
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90 | default n
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91 | depends on CONFIG_ASH_MATH_SUPPORT
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92 | help
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93 | Enable 64-bit math support in the ash shell. This will make
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94 | the shell slightly larger, but will allow computation with very
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95 | large numbers.
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96 |
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97 | config CONFIG_ASH_GETOPTS
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98 | bool "Builtin getopt to parse positional parameters"
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99 | default n
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100 | depends on CONFIG_ASH
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101 | help
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102 | Enable getopts builtin in the ash shell.
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103 |
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104 | config CONFIG_ASH_BUILTIN_ECHO
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105 | bool "Builtin version of 'echo'"
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106 | default y
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107 | select CONFIG_ECHO
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108 | depends on CONFIG_ASH
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109 | help
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110 | Enable support for echo, built in to ash.
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111 |
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112 | config CONFIG_ASH_BUILTIN_TEST
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113 | bool "Builtin version of 'test'"
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114 | default y
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115 | select CONFIG_TEST
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116 | depends on CONFIG_ASH
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117 | help
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118 | Enable support for test, built in to ash.
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119 |
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120 | config CONFIG_ASH_CMDCMD
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121 | bool "'command' command to override shell builtins"
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122 | default n
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123 | depends on CONFIG_ASH
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124 | help
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125 | Enable support for the ash 'command' builtin, which allows
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126 | you to run the specified command with the specified arguments,
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127 | even when there is an ash builtin command with the same name.
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128 |
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129 | config CONFIG_ASH_MAIL
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130 | bool "Check for new mail on interactive shells"
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131 | default y
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132 | depends on CONFIG_ASH
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133 | help
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134 | Enable "check for new mail" in the ash shell.
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135 |
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136 | config CONFIG_ASH_OPTIMIZE_FOR_SIZE
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137 | bool "Optimize for size instead of speed"
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138 | default y
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139 | depends on CONFIG_ASH
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140 | help
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141 | Compile ash for reduced size at the price of speed.
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142 |
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143 | config CONFIG_ASH_RANDOM_SUPPORT
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144 | bool "Pseudorandom generator and variable $RANDOM"
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145 | default n
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146 | depends on CONFIG_ASH
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147 | help
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148 | Enable pseudorandom generator and dynamic variable "$RANDOM".
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149 | Each read of "$RANDOM" will generate a new pseudorandom value.
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150 | You can reset the generator by using a specified start value.
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151 | After "unset RANDOM" then generator will switch off and this
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152 | variable will no longer have special treatment.
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153 |
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154 | config CONFIG_ASH_EXPAND_PRMT
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155 | bool "Expand prompt string"
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156 | default n
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157 | depends on CONFIG_ASH
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158 | help
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159 | "PS#" may be contain volatile content, such as backquote commands.
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160 | This option recreates the prompt string from the environment
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161 | variable each time it is displayed.
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162 |
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163 | config CONFIG_HUSH
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164 | bool "hush"
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165 | default n
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166 | select CONFIG_TRUE
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167 | select CONFIG_FALSE
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168 | select CONFIG_TEST
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169 | help
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170 | hush is a very small shell (just 18k) and it has fairly complete
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171 | Bourne shell grammar. It even handles all the normal flow control
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172 | options such as if/then/elif/else/fi, for/in/do/done, while loops,
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173 | etc.
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174 |
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175 | It does not handle case/esac, select, function, here documents ( <<
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176 | word ), arithmetic expansion, aliases, brace expansion, tilde
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177 | expansion, &> and >& redirection of stdout+stderr, etc.
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178 |
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179 |
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180 | config CONFIG_LASH
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181 | bool "lash"
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182 | default n
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183 | select CONFIG_TRUE
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184 | select CONFIG_FALSE
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185 | select CONFIG_TEST
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186 | help
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187 | lash is the very smallest shell (adds just 10k) and it is quite
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188 | usable as a command prompt, but it is not suitable for any but the
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189 | most trivial scripting (such as an initrd that calls insmod a few
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190 | times) since it does not understand any Bourne shell grammar. It
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191 | does handle pipes, redirects, and job control though. Adding in
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192 | command editing makes it a very nice lightweight command prompt.
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193 |
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194 |
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195 | config CONFIG_MSH
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196 | bool "msh"
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197 | default n
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198 | select CONFIG_TRUE
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199 | select CONFIG_FALSE
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200 | select CONFIG_TEST
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201 | help
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202 | The minix shell (adds just 30k) is quite complete and handles things
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203 | like for/do/done, case/esac and all the things you expect a Bourne
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204 | shell to do. It is not always pedantically correct about Bourne
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205 | shell grammar (try running the shell testscript "tests/sh.testcases"
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206 | on it and compare vs bash) but for most things it works quite well.
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207 | It also uses only vfork, so it can be used on uClinux systems.
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208 |
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209 | comment "Bourne Shell Options"
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210 | depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
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211 |
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212 | config CONFIG_FEATURE_SH_EXTRA_QUIET
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213 | bool "Hide message on interactive shell startup"
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214 | default n
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215 | depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
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216 | help
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217 | Remove the busybox introduction when starting a shell.
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218 |
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219 | config CONFIG_FEATURE_SH_STANDALONE_SHELL
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220 | bool "Standalone shell"
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221 | default n
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222 | depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
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223 | help
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224 | This option causes the selected busybox shell to use busybox applets
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225 | in preference to executables in the PATH whenever possible. For
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226 | example, entering the command 'ifconfig' into the shell would cause
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227 | busybox to use the ifconfig busybox applet. Specifying the fully
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228 | qualified executable name, such as '/sbin/ifconfig' will still
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229 | execute the /sbin/ifconfig executable on the filesystem. This option
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230 | is generally used when creating a statically linked version of busybox
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231 | for use as a rescue shell, in the event that you screw up your system.
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232 |
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233 | Note that this will *also* cause applets to take precedence
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234 | over shell builtins of the same name. So turning this on will
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235 | eliminate any performance gained by turning on the builtin "echo"
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236 | and "test" commands in ash.
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237 |
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238 | Note that when using this option, the shell will attempt to directly
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239 | run '/bin/busybox'. If you do not have the busybox binary sitting in
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240 | that exact location with that exact name, this option will not work at
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241 | all.
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242 |
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243 | config CONFIG_FEATURE_COMMAND_EDITING
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244 | bool "Command line editing"
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245 | default n
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246 | depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
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247 | help
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248 | Enable command editing in shell.
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249 |
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250 | config CONFIG_FEATURE_COMMAND_EDITING_VI
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251 | bool "vi-style line editing commands"
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252 | default n
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253 | depends on CONFIG_FEATURE_COMMAND_EDITING
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254 | help
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255 | Enable vi-style line editing in the shell. This mode can be
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256 | turned on and off with "set -o vi" and "set +o vi".
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257 |
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258 | config CONFIG_FEATURE_COMMAND_HISTORY
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259 | int "History size"
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260 | default 15
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261 | depends on CONFIG_FEATURE_COMMAND_EDITING
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262 | help
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263 | Specify command history size in shell.
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264 |
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265 | config CONFIG_FEATURE_COMMAND_SAVEHISTORY
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266 | bool "History saving"
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267 | default n
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268 | depends on CONFIG_ASH && CONFIG_FEATURE_COMMAND_EDITING
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269 | help
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270 | Enable history saving in ash shell.
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271 |
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272 | config CONFIG_FEATURE_COMMAND_TAB_COMPLETION
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273 | bool "Tab completion"
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274 | default n
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275 | depends on CONFIG_FEATURE_COMMAND_EDITING
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276 | help
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277 | Enable tab completion in shell.
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278 |
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279 | config CONFIG_FEATURE_COMMAND_USERNAME_COMPLETION
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280 | bool "Username completion"
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281 | default n
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282 | depends on CONFIG_FEATURE_COMMAND_TAB_COMPLETION
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283 | help
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284 | Enable username completion in shell.
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285 |
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286 | config CONFIG_FEATURE_SH_FANCY_PROMPT
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287 | bool "Fancy shell prompts"
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288 | default n
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289 | depends on CONFIG_FEATURE_COMMAND_EDITING
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290 | help
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291 | Setting this option allows for prompts to use things like \w and
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292 | \$ and also using escape codes.
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293 |
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294 | endmenu
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