## rails console # nil nil.nil? #=> true "".nil? #=> false " ".nil? #=> false 0.nil? #=> false true.nil? #=> false false.nil? #=> false [].nil? #=> false {}.nil? #=> false # empty "".empty? #=> true " ".empty? #=> false [].empty? #=> true …

.bashrc hg_branch() { hg branch 2> /dev/null | awk '{print " (hg:"$1""}' } hg_rev() { hg parents --template "r{rev}\n" 2> /dev/null | awk '{print " "$1")"}' } git_branch() { git branch 2>/dev/null | awk '/^\*/ {print " " " (git:" $2 ")"}' …