bash 路径中的波浪号不会扩展到主目录
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Tilde in path doesn't expand to home directory
提问by Benjamin
Say I have a folder called Foolocated in /home/user/(my /home/useralso being represented by ~).
假设我有一个名为的文件夹Foo位于/home/user/（我的/home/user也由 表示~）。
I want to have a variable
我想要一个变量
a="~/Foo"and then do
a="~/Foo"然后做
cd $a
cd $a
I get
-bash: cd: ~/Foo: No such file or directory
我得到
-bash: cd: ~/Foo: No such file or directory
However if I just do cd ~/Fooit works fine. Any clue on how to get this to work?
但是，如果我只是这样做，cd ~/Foo它就可以正常工作。有关如何使其工作的任何线索？
回答by bmk
You can do (without quotes during variable assignment):
你可以这样做（在变量赋值期间没有引号）：
a=~/Foo
cd "$a"
But in this case the variable $awill not store ~/Foobut the expanded form /home/user/Foo. Or you could use eval:
但在这种情况下，变量$a将不会存储，~/Foo而是扩展形式/home/user/Foo。或者你可以使用eval：
a="~/Foo"
eval cd "$a"
回答by user268396
You can use $HOMEinstead of the tilde (the tilde is expanded by the shell to the contents of $HOME).
Example:
您可以使用$HOME代替波浪号（波浪号由外壳扩展为 的内容$HOME）。例子：
dir="$HOME/Foo";
cd "$dir";
回答by khamer
A much more robust solution would be to use something like sed or even better, bash parameter expansion:
一个更强大的解决方案是使用类似 sed 甚至更好的 bash 参数扩展：
somedir="~/Foo/test~/ing";
cd ${somedir/#\~/$HOME}
or if you must use sed,
或者如果你必须使用 sed，
cd $(echo $somedir | sed "s#^~#$HOME#")
回答by danron
If you use double quotes the ~ will be kept as that character in $a.
如果您使用双引号， ~ 将作为该字符保留在 $a 中。
cd $a will not expand the ~ since variable values are not expanded by the shell.
cd $a 不会扩展 ~ 因为变量值不会被 shell 扩展。
The solution is:
解决办法是：
eval "cd $a"
评估“cd $a”
