comm 5.0.91: $ comm /tmp/ILGSTEXT.TXT /var/tmp goes blindly forth. $ comm -1 /tmp/ILGSTEXT.TXT /var/tmp rightly refuses to go blindly forth, saying that /var/tmp is a directory. Same with -2 -3. BTW, maybe warn upon any use of -1 -2 -3 all at once.
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