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-a.join -o 1.2 -e NONE <(echo a) <(echo a)would also outputNONEjoin -a 1 -a 2 -t " " -e "NULL" -1 1 -2 1 <(sort file1) <(sort file2)not output NULL, supposefile2has unpairable line?file1andfile2are here unix.stackexchange.com/q/458068/674join -a 2 -o0,1.2,2.2 -t " " -e "NULL" <(sort file1) <(sort file2)-ework? Does-eonly work with-o?