Download and Untar any URL

Shell Programming and Scripting
1

Hi,

I am trying to make a flexible bash script which does the following:

Downloads a URL from a variable
Unzips it
Deletes the original archive

The problem is, the format could be .tar, .tar.gz etc, it wont be constant.

This is what I have currently:

#!/bin/bash

dl_dir="/opt"


function file_download()
{
    wget $2 -P "$dl_dir"
    tar xzf $1 -C $1
}

function user_create()
{
    useradd -s /usr/sbin/nologin -r $2
    chown -R $1 /opt/$1
}

# NGINX
name="nginx"
name_url="http://nginx.org/download/nginx-1.1.2.tar.gz"
file_download "$name" "${name}_url"
user_create "$name" "${name}_user"

Is the best approach to grab the filename from the URL and store that as a variable that I can use for the Untar and delete operation?

---------- Post updated at 03:59 PM ---------- Previous update was at 03:44 PM ----------

In an effort to answer my own question I wrote this:

#!/bin/bash

dl_dir="/opt"

function file_download()
{

# Grab filename from URL string
    filename={$2##*/}

# Download URL into download directory
    wget $2 -P "$dl_dir"

# Untar the filename and move to named folder in download directory
    tar xzf $filename -C "${dl_dir}/${name}"

# Remove original tarball
    rm  "${dl_dir}/${name}"	
}

# NGINX
name="nginx"
name_url="http://nginx.org/download/nginx-1.1.2.tar.gz"
file_download "$name" "${name}_url"
2

See my unpack script at http://cfajohnson.com/shell/scripts/unpack-sh