1 | ## compare_shells: bash dash mksh zsh
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2 |
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3 | #### ~ expansion in assignment
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4 | HOME=/home/bob
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5 | a=~/src
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6 | echo $a
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7 | ## stdout: /home/bob/src
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8 |
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9 | #### ~ expansion in readonly assignment
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10 | # dash fails here!
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11 | # http://stackoverflow.com/questions/8441473/tilde-expansion-doesnt-work-when-i-logged-into-gui
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12 | HOME=/home/bob
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13 | readonly const=~/src
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14 | echo $const
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15 | ## stdout: /home/bob/src
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16 | ## BUG dash stdout: ~/src
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17 |
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18 | #### No ~ expansion in dynamic assignment
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19 | HOME=/home/bob
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20 | binding='const=~/src'
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21 | readonly "$binding"
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22 | echo $const
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23 | ## stdout: ~/src
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24 |
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25 | #### No tilde expansion in word that looks like assignment but isn't
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26 | # bash and mksh mistakenly expand here!
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27 | # bash fixes this in POSIX mode (gah).
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28 | # http://lists.gnu.org/archive/html/bug-bash/2016-06/msg00001.html
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29 | HOME=/home/bob
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30 | echo x=~
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31 | ## stdout: x=~
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32 | ## BUG bash/mksh stdout: x=/home/bob
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33 |
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34 | #### tilde expansion of word after redirect
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35 | HOME=$TMP
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36 | echo hi > ~/tilde1.txt
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37 | cat $HOME/tilde1.txt | wc -c
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38 | ## stdout: 3
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39 | ## status: 0
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40 |
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41 | #### other user
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42 | echo ~nonexistent
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43 | ## stdout: ~nonexistent
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44 | # zsh doesn't like nonexistent
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45 | ## OK zsh stdout-json: ""
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46 | ## OK zsh status: 1
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47 |
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48 | #### ${undef:-~}
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49 | HOME=/home/bar
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50 | echo ${undef:-~}
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51 | echo ${HOME:+~/z}
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52 | echo "${undef:-~}"
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53 | echo ${undef:-"~"}
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54 | ## STDOUT:
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55 | /home/bar
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56 | /home/bar/z
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57 | ~
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58 | ~
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59 | ## END
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60 |
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61 | #### ${x//~/~root}
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62 | HOME=/home/bar
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63 | x=~
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64 | echo ${x//~/~root}
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65 |
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66 | # gah there is some expansion, what the hell
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67 | echo ${HOME//~/~root}
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68 |
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69 | x=[$HOME]
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70 | echo ${x//~/~root}
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71 |
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72 | ## STDOUT:
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73 | /root
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74 | /root
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75 | [/root]
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76 | ## END
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77 | ## N-I dash status: 2
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78 | ## N-I dash stdout-json: ""
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79 |
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80 | #### x=foo:~ has tilde expansion
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81 | HOME=/home/bar
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82 | x=foo:~
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83 | echo $x
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84 | echo "$x" # quotes don't matter, the expansion happens on assignment?
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85 | x='foo:~'
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86 | echo $x
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87 |
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88 | x=foo:~, # comma ruins it, must be /
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89 | echo $x
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90 |
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91 | x=~:foo
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92 | echo $x
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93 |
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94 | # no tilde expansion here
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95 | echo foo:~
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96 | ## STDOUT:
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97 | foo:/home/bar
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98 | foo:/home/bar
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99 | foo:~
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100 | foo:~,
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101 | /home/bar:foo
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102 | foo:~
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103 | ## END
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104 |
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105 | #### a[x]=foo:~ has tilde expansion
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106 | case $SH in (dash|zsh) exit ;; esac
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107 |
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108 | HOME=/home/bar
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109 | declare -a a
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110 | a[0]=foo:~
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111 | echo ${a[0]}
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112 |
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113 | declare -A A
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114 | A['x']=foo:~
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115 | echo ${A['x']}
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116 |
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117 | ## STDOUT:
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118 | foo:/home/bar
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119 | foo:/home/bar
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120 | ## END
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121 | ## N-I dash/zsh stdout-json: ""
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122 |
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123 | #### tilde expansion an assignment keyword
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124 | HOME=/home/bar
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125 | f() {
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126 | local x=foo:~
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127 | echo $x
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128 | }
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129 | f
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130 | ## STDOUT:
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131 | foo:/home/bar
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132 | ## END
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133 | ## BUG dash STDOUT:
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134 | foo:~
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135 | ## END
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136 |
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137 | #### x=${undef-~:~}
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138 | HOME=/home/bar
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139 |
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140 | x=~:${undef-~:~}
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141 | echo $x
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142 |
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143 | # Most shells agree on a different behavior, but with the OSH parsing model,
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144 | # it's easier to agree with yash. bash disagrees in a different way
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145 |
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146 | ## STDOUT:
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147 | /home/bar:/home/bar:/home/bar
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148 | ## END
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149 | ## OK osh/yash STDOUT:
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150 | /home/bar:~:~
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151 | ## END
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152 |
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153 | #### strict tilde
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154 | echo ~nonexistent
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155 |
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156 | shopt -s strict_tilde
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157 | echo ~nonexistent
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158 |
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159 | echo status=$?
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160 | ## status: 1
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161 | ## STDOUT:
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162 | ~nonexistent
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163 | ## END
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164 | ## N-I bash/dash/mksh status: 0
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165 | ## N-I bash/dash/mksh STDOUT:
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166 | ~nonexistent
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167 | ~nonexistent
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168 | status=0
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169 | ## END
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170 | ## OK zsh stdout-json: ""
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171 |
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172 | #### temp assignment x=~ env
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173 |
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174 | HOME=/home/bar
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175 |
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176 | xx=~ env | grep xx=
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177 |
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178 | # Does it respect the colon rule too?
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179 | xx=~root:~:~ env | grep xx=
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180 |
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181 | ## STDOUT:
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182 | xx=/home/bar
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183 | xx=/root:/home/bar:/home/bar
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184 | ## END
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