Add characters to text files

Hi,

I am wanting to add the number 1 in front of each line contained within a text file on my server.

The lines within the text file would read as below but may change for each text file.

PV_01818796_-
PV_01818798_-
PV_01818799_-

The end result would be to find text file on server, copy it, edit each line as below.

1 PV_01818796_-

Thanks in advance.

Just open it for input and send it to another file with the new characters, at the end kill the old file and rename the new file with the original name.