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

Perl from command line,

perl -MFile::Basename -MFile::Path=make_path -e'
  make_path(dirname($_)), open(F, ">>", $_) for pop;
' /opt/test/test.txt