Bug 1011663 - grep -r behavior different between RHEL6 and Fedora 20
grep -r behavior different between RHEL6 and Fedora 20
Product: Fedora
Classification: Fedora
Component: grep (Show other bugs)
Unspecified Unspecified
medium Severity medium
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Assigned To: Jaroslav Škarvada
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-09-24 14:23 EDT by Alexander Todorov
Modified: 2013-09-27 06:10 EDT (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-09-27 06:10:55 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description Alexander Todorov 2013-09-24 14:23:30 EDT
Description of problem:

grep -r is behaving differently between distros. Not sure if a broken behavior has been fixed or bug introduced.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:

Execute the following from /tmp (THIS IS IMPORTANT)

1. grep -roe '^nfs.*--server' /root/anaconda-ks.cfg | grep -roe ^nfs

where anaconda-ks.cfg contains something like:

nfs --server=nfs-01.eng.brq.redhat.com --dir=/pub/fedora/linux/development-snapshot-20130924/20/x86_64/os/ --opts="nolock"

Actual results:
On RHEL 6 with grep-2.6.3-4.el6.x86_64 this yields just "nfs", while on Fedora 20 it yields empty string.

Expected results:
Same result in both versions.

Additional info:

Reading the man page I see -r is for recursion which is not needed in this case. Indeed removing -r from the command sequence gives correct results.

If you execute from /root on Fedora 20:
# grep -roe '^nfs.*--server' /root/anaconda-ks.cfg | grep -roe ^nfs

while on RHEL 6 from /root:
# grep -roe '^nfs.*--server' /root/anaconda-ks.cfg | grep -roe ^nfs

I think in the Fedora 20 version -r implies to recursively scan all files in the local directory regardless of input on stdout while in RHEL6 -r doesn't have an effect if a file/stdout is specified. Not sure which version is at fault.
Comment 1 Jaroslav Škarvada 2013-09-27 06:10:55 EDT
This seems to be bug in the RHEL-6 grep, that was fixed by the following upstream commit:

I think it is not worth backporting to RHEL-6. The current Fedora's prep behaviour is according to the manual page, thus closing as not a bug.

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