Very Computer

1. Appending to a line with Sed

I am trying to append a number to each line in a file, which I know has to
be possible, I am just unable to get it working correctly.  If I have a
file:

$ cat foo
a
b
c
d

I want to run a sed command that would output the following:

$ sed '?' foo
a, 1
b, 1
c, 1
d, 1

I have looked at the append function but I can't get it to append the text
to the line, it wants to make a newline, so my output  looks like this:

$ sed 'a\
a
", 1"
b
", 1"
c
", 1"
d
", 1"

Any help on this would be appreciated.
Thanks,
Matt

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