Retreive script from Pastebin

#!/bin/bash

# Usage :
#
# Just retreive file from pastebin :
# 'pastebin.sh arg1 arg2'
# arg1 : pastebin file ID
# arg2 : destination file
# example : 'pastebin.sh nL9DDqeT /usr/local/bin/pastebin.sh'
#
# Retreive script and set executable :
# 'pastebin.sh arg1 arg2 arg3'
# arg1 : '-x' to set executable
# arg2 : pastebin file ID
# arg3 : destination file
# example : 'pastebin.sh -x nL9DDqeT /usr/local/bin/pastebin.sh'

# Check if set file to be executable is wanted
if [ $1 == "-x" ]; then
    # Delete first argument ('-x')
    shift 1
    # Store in a variable chmod command to execute later
    cmd="chmod +x $2"
fi

# Retreive script
wget -qO- "http://pastebin.com/raw.php?i=$1" | tr -d '\r' > $2

# If previously set, execute chmod command
$cmd