So posix says this: -t termlist Write information for processes associated with terminals given in termlist. The application shall ensure that the termlist is a single argument in the form of a <blank> or <comma>-separated list. Terminal identifiers shall be given in an implementation-defined format. [XSI] [Option Start] On XSI-conformant systems, they shall be given in one of two forms: the device's filename (for example, tty04) or, if the device's filename starts with tty, just the identifier following the characters tty (for example, "04" ). [Option End]
And once again posix is somewhere back before the 1980's because pseudo-terminals do not start with "/dev/tty". In the case of linux, they've been /dev/pts/12 since, apparently, 1998. The ps man page says: -t ttylist Select by tty. This selects the processes associated with the terminals given in ttylist. Terminals (ttys, or screens for text output) can be specified in several forms: /dev/ttyS1, ttyS1, S1. A plain "-" may be used to select processes not attached to any terminal. Which is, once again, outright lying, because "-t 41" matches pts/41 but -t 5 does _not_ match tty5. You have to say "-t tty5" to get the getty instance on there. Meanwhile procutils "ps -t pts/41" works as does "ps -t pts/../tty5" which is just _creepy_ and I'm not doing that bit. And -tty S0 is of course /dev/ttyS0 not /dev/pts/S0. I pine for a spec that means something, Rob P.S. Once again, the hard part is writing help text so ps --help can explain the expected behavior succinctly. Yeah, I can do that, but how do I explain it in a way that makes it sound intentional: -t ## is a pts (unless maybe there isn't one? Does it fall back to tty5 if there's no pts5? Hard to test right now because I've got /dev/pts/68 but only /dev/tty63). Grrr. STOP TRYING TO BE CLEVER IN WAYS YOU DON'T EXPLAIN TO YOUR USERS IN THE MAN PAGE. Right special case "-t number" to be pts/ instead of tty, accept pts/ to _not_ mean implicit tty prefix... _______________________________________________ Toybox mailing list Toybox@lists.landley.net http://lists.landley.net/listinfo.cgi/toybox-landley.net