bash：显示绝对路径，并在提示符下解析符号链接

Question

Is it possible to have my shell display the full current working directory, even when I cd into a symlink? My current PS1 reads

PS1="
[ \w ] 
=> "

However when I cd into a linked directory, it displays (for example) [ ~/LINKEDDIR ] instead of something more useful to me such as [ /var/etc/bin/the/actual/path ] .

Is there anyway to change that?

Answer 1

Instead of using the \\w escape sequence, you'll have to call the pwd utility directly and use its -P option to fully expand any symlinks. The following should work (note the single quotes, so that the command substitution is executed every time the prompt is displayed, rather than just once when PS1 is defined).

PS1='\n[ $(pwd -P) ]\n=> '