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Shell Programming and Scripting
Preserve output order when redirecting stdout and stderr
Post 302382478 by radoulov on Thursday 24th of December 2009 04:30:04 AM
12-24-2009
Quote:
For me those great tools was new, but I searched around for infos about
and the reason for the empty error.log is, that expect merges the stdout and stderr
together internal and afterwards the information, where the output comes from (stderr or stdout)
is gone away.
and the reason for the empty error.log is, that expect merges the stdout and stderr
together internal and afterwards the information, where the output comes from (stderr or stdout)
is gone away.
that's why I said you'll still need to modify your program to distinguish error from output.
The idea is to "mark" the error with "error:" for example, and output with "output:"
Quote:
So if there is no way to use some wrapper "around" the binary or php script,
which adds the leading numbers and preserves the channel where the output was written
(so that stdout still is stdout and stderr still is stderr) this is not a working solution
for my problem ...
which adds the leading numbers and preserves the channel where the output was written
(so that stdout still is stdout and stderr still is stderr) this is not a working solution
for my problem ...
I don't know php, may be you should avoid using external commands and shell pipes in those cases.
I believe the only solution is to modify the libc you're using (I'm joking
).Could you explain why you need such a thing?
There could be a different, better way to solve your problem.
---------- Post updated 12-24-09 at 10:30 AM ---------- Previous update was 12-23-09 at 04:46 PM ----------
Well,
now that I think again, with shells that support process substitution you can do something like this:
Code:
prog 2> >(
awk '{
c++ || "date +%N" | getline sdt
$0 = c ":" sdt ":ERR:" $0
print > "err.log"
}1'
) > >(
awk '{
c++ || "date +%N" | getline sdt
$0 = c ":" sdt ":OUT:" $0
print > "out.log"
}1'
) |
sort -nyou can use Perl's Time::HiRes gettimeofday. We need it to get only the start time in order to be able to sort the output properly.
For example:
Code:
$ ./s 2> >(
awk '{
c++ || "date +%N" | getline sdt
$0 = c ":" sdt ":ERR:" $0
print > "err.log"
}1'
) > >(
awk '{
c++ || "date +%N" | getline sdt
$0 = c ":" sdt ":OUT:" $0
print > "out.log"
}1'
) | sort -n > out_and_err.log
$ head *log
==> err.log <==
1:694103195:ERR:err 1
2:694103195:ERR:err 2
3:694103195:ERR:err 3
4:694103195:ERR:err 4
5:694103195:ERR:err 5
==> out_and_err.log <==
1:693535244:OUT:out 1
1:694103195:ERR:err 1
2:693535244:OUT:out 2
2:694103195:ERR:err 2
3:693535244:OUT:out 3
3:694103195:ERR:err 3
4:693535244:OUT:out 4
4:694103195:ERR:err 4
5:693535244:OUT:out 5
5:694103195:ERR:err 5
==> out.log <==
1:693535244:OUT:out 1
2:693535244:OUT:out 2
3:693535244:OUT:out 3
4:693535244:OUT:out 4
5:693535244:OUT:out 5
$|
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