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Check the paste command. You have to specify a null delimiter using the -d option, since the default one is TAB. Also you have to remove the extra dot from the end of the first file or from the beginning of the second one. Suggestion using process substitution:
@grail - my code does work; check it out. The rationale is that, from the example, it is obvious that "file 2" echoes the final column of "file 1", therefore, it is unnecessary to call "file 2" as the output from "file 2" is already embedded in "file 1".
@Trickie - ok ... I will concede that with your rationale this specific example works, but based on the fact that the OP says he has 2 files to be joined, it seemed obvious that this was a simple
example to help illustrate the point. Assuming your version, you could simply do:
@grail - err, no you can't. There are two errors: it doesn't save into a third file, which "noony123" asked for and secondly, your code produces no "dot" as a field separator between the third and fourth fields, again, as "noony123" requested.