I’m a little OCD about my $PATH…

cleanpath () {
    local path p result
    local -A seen
    PATH=${PATH//::/:}
    IFS=":" read -r -a path <<< "$PATH"
    for p in "${path[@]}"; do
        if [ -z "${seen[$p]}" ]; then
            result="$result:$p"
            seen["$p"]=1
        fi
    done
    PATH=${result:1}
}

No, really. I’ve been using these little functions to set up my environment for so long that they used to have sed and perl calls in them, because you couldn’t do all the string-hacking internally in ancient versions of Bash/SH:

# addpath /x/y/bin first|last
# addpath /x/y/bin before|after /z/bin
#
addpath () {
    local pTMP=":$PATH:"
    case "$2" in
    after)
        pTMP=${pTMP/:$3:/:$3:$1:}
        ;;
    before)
        pTMP=${pTMP/:$3:/:$1:$3:}
        ;;
    first)
        pTMP=:$1$pTMP
        ;;
    last)
        pTMP=$pTMP$1:
        ;;
    *)
        echo "usage: addpath /foo/bin first|last|before|after /bar/bin"
        ;;
    esac
    pTMP=${pTMP#:}
    pTMP=${pTMP%:}
    if [ ! -z "$pTMP" ]; then
        PATH=$pTMP
    fi
}

# delpath /x/y/bin
#
delpath () {
    local pTMP=":$PATH:"
    pTMP=${pTMP/:$1:/:}
    pTMP=${pTMP#:}
    pTMP=${pTMP%:}
    if [ ! -z "$pTMP" ]; then
        PATH=$pTMP
    fi
}

(and by “used to” I mean “until yesterday”, because I just rewrote them)

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