bash-shell-base/modules/utility/path.sh

#!/bin/bash

# get full absolute bath from a current or parent path
function abs-path {
    local target="$1"
    if [ "$target" == "." ]; then
        echo "$(pwd)"
        elif [ "$target" == ".." ]; then
        echo "$(dirname "$(pwd)")"
    else
        echo "$(cd "$(dirname "$1")"; pwd)/$(basename "$1")"
    fi
}

isAbsPath() {
    if [[ "${1:0:1}" == / || "${1:0:2}" == ~[/a-z] ]]
    then
        echo "true"
        return 0
    else
        return 1
    fi
}