cx.sh

# change part of pwd path, and cd to it
# example:
#  /usr/lib/foo$ cx lib src
#  /usr/src/foo$
# slashes need double escaping: \\/
# surprisingly, most everything else doesn't
cx() {
 local cd="$PWD"
 while [ $1 ]; do
  cd="$(echo $cd | sed "s/$1/$2/")"
  shift; shift
 done
 shopt -s cdspell
 cd $cd
 shopt -u cdspell
}