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?

Found a great post over at good coders code, great reuse. This one deals with performing operations on sets using only unix (bash) command line operations on files of text. * Set Membership. Test if an element belongs to a set. * Set Equality. Test if two sets contain the same elements. * Set Cardinality. […]