Mar 232010


My professor sent us this little one liner 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:


Of course you can also use


 Posted by at 10:00 pm