[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: found bug
Re: found bug
Wed, 22 Aug 2018 20:55:20 -0500
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1
On 08/22/2018 06:32 PM, Karl Riauba wrote:
I think I found egrep bug.
Thanks for your report. However, you've reported to an old address;
'grep --help' currently recommends that bug reports be sent to
address@hidden, which makes me wonder if the behavior you are seeing
may have changed in the meantime with a newer version of grep.
No tabs in example file or in variable.
Maybe not, but your mailer line wrapped things, which means I can't
readily reproduce your output by just copying and pasting from your
email. However, I think I've managed to reconstruct the egrep_bug file
that you describe, containing just 5 lines, and your $egrep variable
with no newlines but a bunch of values with one space on either side.
10.193.132.65:9102 should suppose to be filtered out, but it doesn't.
> $ echo ===$egrep===
It's hard to say if I exactly matched the contents of your $egrep
variable, since you forgot to use shell quoting, so if your variable
contained multiple spaces, word splitting and then echo's argument
pasting collapsed those multiple spaces down to one.
$ cat egrep_bug | egrep -v "$egrep"
Side comment: Useless use of cat; you could have written:
egrep -v "$egrep" < egrep_bug
for fewer processes.
tcp 0 0 0.0.0.0:9102 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:9125 0.0.0.0:* LISTEN
tcp 0 0 10.193.132.65:9102 10.196.128.42:46852
When I tried to reproduce your setup, this line was filtered for me,
using grep 3.1. But it was very easy to make this line not be filtered,
egrep -v " $egrep" < egrep_bug
since that creates a pattern which requires two leading spaces, when
only one is present in the input. Since you didn't use proper shell
quoting, I can't tell if the bug is in your usage, or if it really was
something broken in whatever version of grep you are using.
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
- found bug, Karl Riauba, 2018/08/22
- Re: found bug,
Eric Blake <=