pathmunge

gistfile1.txt

# Pathmunge -- add a new path to a path variable
# arg1 - name of path variable
# arg2 - new path to add
# arg3 - if present APPEND rather than PREPEND
pathmunge () {
    local pathVar=$1
    local pathVal=$(eval echo \$$pathVar)
    local newVal=$2
    local after=$3
    if [ -z "$pathVal" ]; then
        pathVal=$newVal
    elif ! echo $pathVal | /usr/bin/egrep -q "(^|:)$newVal($|:)" >/dev/null 2>&1 ; then
       if [ ! -z "$after" ] ; then
          pathVal=$pathVal:$newVal
       else
          pathVal=$newVal:$pathVal
       fi
    fi
    eval $pathVar=$pathVal
}