How to touch a file and mkdir if needed in one line

Question

I need to touch a file with an absolute file name such as: /opt/test/test.txt, but I\'m not sure if there is /opt/test existed on the system. So the code should similar with thi

Answer 1

I like typing very little, so I put this command into a named fn in my .profile, but I used this formulation for years before I did it:

mkdir -p dirname/sub/dir && touch $_/filename.ext

The variable $_ stores the last argument to the previous command. Pretty handy to know about overall.