10-23-2013
The answer really depends on the features your current environment is using.
Some third-party applications (e.g. Oracle, Teradata, Siebel, PeopleSoft, etc) are "certified" to run on RHEL 5.x but not on 6.x so if you are using their official support it would be best to comply with their specifications in order to avoid a negative response when you *really* need vendor assistance.
You should also evaluate the current features your environment is using: Does it heavily rely on NFS and/or virtualization? These two are some of the topics that have changed the most in RHEL6 (compared to RHEL5) and might need some major adjustments during a migration.
IMO, it would be reasonable for a development environment or even UAT but I wouldn't mix different OS versions for prod environment unless it's extremely necessary or for a very short period of time (throughout the migration process, for example).
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ENV(1) User Commands ENV(1)
NAME
env - run a program in a modified environment
SYNOPSIS
env [OPTION]... [-] [NAME=VALUE]... [COMMAND [ARG]...]
DESCRIPTION
Set each NAME to VALUE in the environment and run COMMAND.
Mandatory arguments to long options are mandatory for short options too.
-i, --ignore-environment
start with an empty environment
-0, --null
end each output line with NUL, not newline
-u, --unset=NAME
remove variable from the environment
-C, --chdir=DIR
change working directory to DIR
--help display this help and exit
--version
output version information and exit
A mere - implies -i. If no COMMAND, print the resulting environment.
AUTHOR
Written by Richard Mlynarik and David MacKenzie.
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Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/env>
or available locally via: info '(coreutils) env invocation'
GNU coreutils 8.28 January 2018 ENV(1)