Comment by nsb1

I cribbed these from someplace - slightly different approach:

  ###################################################################
  # Add directory to path
  pathadd() {          
      newelement=${1%/}
      if [ -d "$1" ] && ! echo $PATH | grep -E -q "(^|:)$newelement($|:)" ; then
          if [ "$2" = "after" ] ; then
              PATH="$PATH:$newelement"
          else         
              PATH="$newelement:$PATH"
          fi
      fi
  }
 
  ###################################################################
  # Remove directory from path
  pathrm() {
      PATH="$(echo $PATH | sed -e "s;\(^\|:\)${1%/}\(:\|\$\);\1\2;g" -e \
      's;^:\|:$;;g' -e 's;::;:;g')"
  }