Why use awk at all? 

ypcat passwd | perl -wne '/:/ and print "$`\@domain.local\n";'

[download]
or 
ypcat passwd | cut -d: -f1 | sed 's/$/@mydomain.local/'

[download]
or 
ypcat passwd | sed 's/:.*/@domain.local/'

[download]

In reply to Re^2: add text to each line of a file by ambrus
in thread add text to each line of a file by stevenrh

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