path operation on bash

path_remove

function path_remove () {
  local IFS=:
  local i A=($PATH)
  for i in ${!A[*]}; do if [[ "${A[$i]}" == "$1" ]] ; then unset A[$i]; fi; done
  export PATH="${A[*]}"
}

; in one line format
; function path_remove () { local IFS=: ; local i A=($PATH) ; for i in ${!A[*]} ; do if [[ "${A[$i]}" == "$1" ]] ; then unset A[$i] ; fi ; done ; export PATH="${A[*]}" ; }

function path_append () { path_remove "$1"; export PATH="$PATH:$1"; }

function path_prepend () { path_remove "$1"; export PATH="$1:$PATH"; }

; example
; path_remove "$(cygpath -u 'C:\Program Files (x86)\Windows Kits\8.1\bin\x64')"