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And taking an idea from your 2nd example we get two more equivalent versions that are still slightly shorter:

sed -n 's/,.*//; /key1/h; /key2/{H; x; s/^[^:]*: \|\n[^:]*://gp}' file

sed -n...

My actual input file was a bit more complicated, and was similar to this:

....
??? key1: word1, word2, word3, word4
....
????? key2: word5, word6, word7
....
?????? key1: word8, word9
.......

Thanks R. Singh (and sorry for forgetting the code tags).

Yes, I did simplify the problem somewhat for brevity, so I will probably have to learn at least some of that arcane looking awk syntax. (I...

I have an input file that looks something like this:

....
key1: ABC
....
key2: DEF
....
key1: GGG
....
key2: HHH
....

The row of dots represents any number of lines that don't contain...