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If you don't need to use awk, paste could work:
$ paste -d $'\n''\n' <fileB fileA - - - | tr -s $'\n''\n' >fileC
The tr part isn't strictly necessary, so you can remove it if you don't mind extra newlines.
tr
$ paste -d $'\n' <fileB fileA - - - | tr -s $'\n' >fileC
$ paste -d '\n' <fileB fileA - - - | tr -s '\n' >fileC
$ cat fileB | paste -d $'\n' <fileB fileA - - - | tr -s $'\n' >fileC
$ cat fileB | paste -d $'\n' fileA - - - | tr -s $'\n' >fileC
The tr part isn't strictly necessary, so you can remove it if you don't mind a couple of extra trailing newlines.
The tr part isn't necessary, so you can remove it if you don't mind a couple of extra trailing newlines.
