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Tree-like output in ls

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

— by clitips on April 26, 2013, 1:37 p.m.

Explanation

This one-liner initially does a recursive listing of the current directory: ls -R.

Any output other that the directory names, identified by : at the very end of each line (hence :$), is filtered out: grep ":$".

Finally there's a little of sed magic replacing any hierarchy level (/) with dashes (-).

Limitations

Works for me with Bash under Linux, Mac OS X, Solaris.