03-08-2011
Quote:
Originally Posted by
Perderabo
It looks to me that both red and green are closing fd 3. What book are you reading?
I do agree with you,the book named "Advanced Bash-scripting Guide"
Quote:
Originally Posted by
Corona688
It'd be more accurate to say that grep and ls get separate sets of file descriptors, so they close them individually. The shell forks twice, once to create each of those processes. FD 3 is closed in the forks but not in the original shell itself. Once they return, the exec closes FD 3 in the shell itself. That's what the exec does, changes the original shell's own file descriptors.
Thanks for your reply.What your said is the same as what i thought.We all think that FD 3 is closed in each process while the book said the process which executed the "ls" did NOT closed that.Confused...
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