In <20101120223808.GA15502@mea.homelinux.org>, Mats Erik Andersson wrote: >Question: Is there some mechanism I can use in the postinst > script that lets me determine whether the upgrade > is being conducted in non-interactive mode? First, you should *assume* non-interactive mode. To test for interactivity, you could try opening /dev/tty. It's not perfect, but non-interactive processes should generally detach from their controlling terminal leaving them without a valid /dev/tty. Another option is to see if both stderr and stdin are ttys, which is how SUSv2 says a shell determines if it is interactive. If both those tests are true, you can be pretty sure that a user can be prompted (on stderr, blah) and you can get a response on stdin. If neither is true, you can be pretty sure user input is not forth-coming. If only one is true you can really be sure one way or the other. (Assume non-interactive, plz.)  On Linux, at least. I don't know if the kFreeBSD port has /dev/tty. -- Boyd Stephen Smith Jr. ,= ,-_-. =. firstname.lastname@example.org ((_/)o o(\_)) ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-' http://iguanasuicide.net/ \_/
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