The get.sh is a command line tool for download a file from URL and extract an archived file.

get.sh

#!/bin/bash
# coding: utf-8

# Check arguments
if [ "$#" = "0" ];then
    {
        echo "usage: get [URL]"
        echo ""
        echo "This get script can download a file from URL argument, and extract it."
    } 1>&2
    exit 1
fi

# Variables
typeset -r TARGET="$1"
typeset -r DEST="$HOME/local/src"
typeset filename
typeset exit_code


# Functions
function is_url() {
    # is_url - check the $1 is url or not
    # args $1: URL string

    local target=$1

    if [[ "$target" =~ ^(http|https):// ]];then
        return 0

    else
        return 1

    fi

}

function download() {
    # download - download the $1
    # args $1: URL string

    local url="$1"
    local filename

    if is_url "$url";then

        filename="$(basename "$url")"

        (curl -# -L -o "$filename" "$url" & wait $!)

        echo "$filename"
        return $?

    else
        printf "'%s' is not a url\n" "$url" 1>&2
        exit 1

    fi

}

function extract() {
    # extract - extract a file
    # args $1: archived file name
    local filename="$1"

    if [[ "$filename" =~ \.tar\.gz$ ]];then

        (tar xvf $filename & wait $!)
        return $?

    elif [[ "$filename" =~ \.zip$ ]];then

        (gzip $filename & wait $!)
        return $?

    else
        return 2
    fi


}


# Main
cd "$DEST"

#  1. download
filename="$(download "$TARGET")"
exit_code=$?

if [ ! "$exit_code" = "0" ];then
    echo "The download was failed" 1>&2
    exit 1
fi

# 2. extract
extract "$filename"
exit_code=$?

if [ "$exit_code" = "0" ];then
    echo "The download & extract was successed."
    printf "An extracted file saved here: '%s'\n" "$DEST/$filename"
    exit 0

elif [ "$exit_code" = "2" ];then
    echo "The download was successed."
    printf "A downloaded file saved here: '%s'\n" "$DEST/$filename"
    exit 0

else
    echo "The extract was failed." 1>&2
    exit 1
fi