[SOLVED] IPV6 address shortening in shell and powershell

IPV6 address shortening in shell and powershell

I have to make a script in shell and PowerShell that shortens ipv6 addresses as much as possible.

Like:

Input: 2001:0db8:03cd:0000:0000:ef45:0006:0123
Output: 2001:db8:3cd:::ef45:6:123

And the script should give a description of itself if -help parameter used but i dont know how to do that in PowerShell.

This is my code in PowerShell, it shortens the addresses correctly:

    param([parameter(Mandatory=$true)]$file)

if (test-path $file){
    foreach ($ip in Get-Content $file){
        $ip=$ip.Replace("0000","")
        Write-Host $ip

}
}

I have no idea how to do the shortening in shell, I tried like this but didn't work:

#!/bin/sh

if [ $1 = "-help" ]
then
echo description

else file = $1
fi

for ip in `cat ipv6.txt`
do
    $ip=$line
    $replace=""
    $echo ${var//0000/$replace}
done

This is the txt file with the addresses: ~~http://uptobox.com/6woujdvdfkmh~~

Solution

We might be going to the same school. This is what I was told to do and it works perfectly:

cat filename | sed -e 's/:0*/:/g' filename