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* src/join.c: Support --check-order and --nocheck-order. New variables check_input_order, seen_unpairable and issued_disorder_warning[]. For --check-order, verify that the input files are in sorted order. For the default case, check the order only if there are unpairable lines. (join): Perform ordering checks after reaching EOF on either input. (usage): Mention --check-order and --nocheck-order. (dupline): Save a copy of the previously-read input line so that we can detect disorder on the input. (get_line): Temporarily save a copy of the previous line (by calling dupline) and check relative ordering (by calling checkorder) before returning the newly-read line. (getseq, join): Tell get_line which file we are reading from. (advance_seq): New function, factoring out some of the code commonly surrounding calls to getseq. (checkorder): New function. Verifies that a pair of consecutive input lines are in sorted order. * doc/coreutils.texi (join invocation): Document the new options --check-order and --nocheck-order. * tests/join/Test.pm (tv): Added tests for --check-order and --nocheck-order. * NEWS: Mention this new feature.