bug#25870: give an example to show what lines join -a and -v are talking about
In (info "(coreutils) join invocation") ‘-a FILE-NUMBER’ Print a line for each unpairable line in file FILE-NUMBER (either ‘1’ or ‘2’), in addition to the normal output. OK but say if we can use both: -a 1 -a 2? (Answer: yes) And if so how to tell which lines are from which file (Answer: by their content only). ‘-v FILE-NUMBER’ Print a line for each unpairable line in file FILE-NUMBER (either ‘1’ or ‘2’), instead of the normal output. OK but say if we can use both: -v 1 -v 2? And if so how to tell which lines are from which file. And in fact give an example to show what lines -a and -v are talking about!
bug#25871: give plain join example first
In (info "(coreutils) join invocation") If the input has no unpairable lines, a GNU extension is available; (shouldn't that ";" be ":"?) the sort order can be any order that considers two fields to be equal if and only if the sort comparison described above considers them to be equal. For example: $ cat file1... OK, but perhaps in the previous paragraph give a mundane regular example of join usage, instead of the first example be this special exception.
