Question

Again a SED question from me 🙂

So, same as last time, I’m wrestling with phone numbers. This time the problem is a bit different.
I this kind of organization currently in my text file:

Areacode:    List of phone numbers:
4444         NUM:111111  NUM:2222222 NUM:33333333
5555         NUM:1111111 NUM:2222    NUM:3333333  NUM:44444444 NUM:5555555

Now, every areacode can have unknown number of numbers, and also the phone numbers are not fixed in length.
What I would like to know, is how could I combine areacode and phone number, to look something like this:

4444-111111, 4444-2222222, 4444-33333333

My first idea was to add again a line break before each phone number and to match these sections with regex, and then just add the first remembered item to second, and first to third:

\1-\2, \1-\3, etc

But of course since sed can only remember 9 arguments, and there can be more than 10 numbers in one line this doesn’t work. Moreover, also non-fixed list of phone numbers made this a no go.
I’m again looking primarily the SED option, as I’ve been trying to get proficient with it – but more efficient solutions with other tools are of course definitely welcome!

Answer 1

$ cat input.txt | sed '1d;s/NUM:/ /g' | awk '{for(i=2;i<=NF;i++)printf("%s-%s%s", $1, $i, i==NF?"\n":",")}'
4444-111111,4444-2222222,4444-33333333
5555-1111111,5555-2222,5555-3333333,5555-44444444,5555-5555555