pragmatism first

isatty

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isatty(3)	referred by	bash(1) \| bash-static(1) \| clush(1) \| mailcap(5) \| rc(1) \| tcpslice(1) \| ttyname(3)
isatty(3)	refer to	attributes(7) \| stat(2) \| ttyname(3)