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Peter Rosin skrev 2011-09-28 17:26:Hi!
When I use bash to build pipelines, they sometimes don't finish but instead some process remains running. Example:
$ tail -f -n 10000 log.txt | grep . | head -n 2
Almost instantly I get the expected two lines of output, but no prompt back. I have to use ctrl-c. If I don't ctrl-c I can run pstree in another terminal and see this:
$ pstree ?âââminttyâââbashâââtail ââminttyâââbashâââpstree
This example is a poor one, as tail simply waits for a new line, when it gets a new line it forwards it to the pipe and promptly receives a SIGPIPE as grep is not there anymore.
I'll get back when I have distilled a better STC. If I can...
Cheers, Peter
Hi Peter, are you referring on something like SIGHUP on PTY closure ?
http://cygwin.com/ml/cygwin/2011-07/msg00295.html http://pubs.opengroup.org/onlinepubs/9699919799/functions/close.html
Regards Marco
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