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An edit in place with deliberate assumptions on the source file (actually, I get this from dwm042's example):
$ cat target-file.txt Address1= Address2= Address3= $ perl -Mstrict -pi -wle 'our @ports; BEGIN { my $source = "tcp 20 tcp + 40 tcp 80"; @ports = $source =~ /tcp\s+(\d+)/g;} $_ .= shift(@ports) +;' target-file.txt $ cat target-file.txt Address1=20 Address2=40 Address3=80
(johngg demonstrates the verbose version of -pi) Or, if you want to keep the original file and redirect the result to other file, you can use -n instead of -p and -i combination. Well, -i.ext keeps the original version with .ext appended to the filename.
$ cat target-file.txt Address1= Address2= Address3= $ perl -Mstrict -wnle 'our @ports; BEGIN { my $source = "tcp 20 tcp 40 + tcp 80"; @ports = $source =~ /tcp\s+(\d+)/g;} $_ .= shift(@ports); p +rint' target-file.txt > output.txt $ cat output.txt Address1=20 Address2=40 Address3=80 $ cat target-file.txt Address1= Address2= Address3=

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In reply to Re: Need a little help appending lines by naikonta
in thread Need a little help appending lines by perl4ever

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