Remove Duplicate Line in Vim?

Question

I\'m trying to use VIM to remove a duplicate line in an XML file I created. (I can\'t recreate the file because the ID numbers will change.)

The file looks something

Answer 1

to the OP, if you have bash 4.0

#!/bin/bash
# use associative array
declare -A DUP
file="myfile.txt"
while read -r line
do
    if [ -z ${DUP[$line]} ];then
        DUP[$line]=1
        echo $line >temp
    fi
done < "$file"
mv temp "$file"