Re: Compare two files and remove if not found ?

donetnoc@xxxxxxxxx wrote:

The passwd file has entrys like this
user1010:x:23524:200::/local/home/user1010:/bin/bash

The aliases file has entrys like this

user_emailadress:user1010

The username can occur one or many times.

I need to clean the aliases file from entrys that does not exist in
the passwd file so the output should be a new aliases file with
usernames that only
exist in the passwd file.

Here was a rough attempt with awk:

awk -F ':' 'FILENAME == "/etc/passwd" {n[$1] = $1}
(FILENAME == "/etc/aliases") && (n[$2]!="") {print}' \
/etc/passwd /etc/aliases

But Ed already posted a more concise and elegant solution :-)

.

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