Compare two sorted files line by line, producing three columns: lines onlyin FILE1, lines only in FILE2 (one leading TAB), and common lines (twoleading TABs):
moonx cli/comm left.txt right.txt
moonx cli/comm -12 left.txt right.txt # only common lines
Options: -1, -2, -3 suppress the corresponding column (combinable as-12, -23, ...). Use - to read stdin. Lines are compared by UTF-16code units, matching LC_ALL=C order for ASCII data.