问题
I want to check whether or not the hidden .git folder exists. First thought was to use:
if [ -d \"~/.git\" ]; then
echo \"Do stuff\"
fi
But the -d apparently does not look for hidden folders.
回答1:
The problem has to do with the tilde being within double quotes.
To get it expanded, you need to put the tilde outside the quotes:
if [ -d ~/".git" ]; then # note tilde outside double quotes!
echo "Do stuff"
fi
Or, alternatively, as commented below by hek2mgl, use $HOME instead of ~:
if [ -d "$HOME/.git" ]
From POSIX in Tilde expansion:
A "tilde-prefix" consists of an unquoted character at the beginning of a word, followed by all of the characters preceding the first unquoted in the word, or all the characters in the word if there is no .
From POSIX in Double Quotes:
Enclosing characters in double-quotes ( "" ) shall preserve the literal value of all characters within the double-quotes, with the exception of the characters dollar sign, backquote, and backslash, as follows:
You can find further explanations in Why doesn't the tilde (~) expand inside double quotes? from the Unix & Linux Stack.
来源：https://stackoverflow.com/questions/41871596/why-isnt-tilde-expanding-inside-double-quotes