see: https://blog.wentao.me/the-linux-command-line/2014/05/09/bash-expansion.html
bash-3.2$ read
~/.bash_profile
bash-3.2$ echo "$REPLY"
~/.bash_profile
bash-3.2$ ls $REPLY
ls: ~/.bash_profile: No such file or directory
bash-3.2$ ls "$REPLY"
ls: ~/.bash_profile: No such file or directory
如何让这个目录展开?