append some characters to the end of line

[hcclnoodles]

Hi there , I have a file that has a varying number of lines but they are all 56 charachters long each, I would like to find way of appending the charachters

,1234

to the end of each line, do i need to do a loop of some kind?

cheers

 

[hoinz]

sed -e 's/$/,1234/' filename > newfile