There are two ways to write error-free programs; only the third works.
Alan J. Perlis
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Thanks for a comprehensively informative article on a (traditionally) confusing area.
I tried out some of the commands, and nearly made it all the way to the end. Separation of stderr and stdout (point 22 in article) led to actual output which differed from expected though. I tried this:
$ touch one.txt
$ rm -rf two.txt
$ ls one.txt two.txt > >(sed "s/^/O /") 2> >(sed "s/^/E /")
O E /bin/ls: cannot access two.txt: No such file or directory
On that final line I was expecting it to start with "E /bin/ls ...". Any ideas why the actual output starts with "O E /bin/ls ..." instead?
P.S.: Same behaviour on bash 3.1.17, 3.2.48 and 4.1.5
$ ls one.txt two.txt > >(sed "s/^/O /") 2> >(sed "s/^/E /" 1>&2)
E /bin/ls: cannot access two.txt: No such file or directory
This does the trick. But don't ask me why, it was just a guess.
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