1 AT-INVALID(1) General Commands Manual AT-INVALID(1)
4 A
\bAt
\bt-
\b-i
\bin
\bnv
\bva
\bal
\bli
\bid
\bd - handling of an invalid AT&T UNIX argument
6 D
\bDE
\bES
\bSC
\bCR
\bRI
\bIP
\bPT
\bTI
\bIO
\bON
\bN
9 valid argument: Version 7 AT&T UNIX
11 invalid argument: AT&T UNIX murks b
\bbo
\bol
\bld
\bd
15 OpenBSD July 4, 2017 OpenBSD