My professor sent us this little one liner (ok, I had to format it to 2 lines to fit in this blog. You know what I mean) which prints out the current directory tree:

ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' \
-e 's/^/ /' -e 's/-/|/'

What’s going on here?

  • ls -R — list files and directories recursively
  • grep ":$" — find lines with : at the end (so only the directories)
  • sed -e — evaluate expressions on the lines
  • s/:$// — remove ‘:’ at the end of the line
  • s/[^-][^\/]*\//--/g — replaces text between / / lines (parent directories) with — , globally on each line
  • s/^/ / — add space at the beginning of the lines
  • s/-/|/ — replace first – of the line with |

I reduced this using the following command. The most notable difference is that I use find instead of ls, which results in also viewing .hidden directories. I’m not sure which command is faster.

find ./ -type d | sed -e 's/[^-][^\/]*\//--/g;s/--/ |-/'

Both commands result in a formatted directory listing, demonstrated below:

  1. Pingback: Dave Drager
  2. Pingback: GeekLad
  3. Pingback: Karl Gechlik

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