09-18-2011
Well, for starters, redhat-release only exists on redhat. it's also only a file, so might lie or be missing.
More distributions have /etc/release but it's not impossible they won't, or be incorrect.
/proc/version is more general but only a Linux thing as far as I know.
uname exists almost everywhere.
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LEARN ABOUT FREEBSD
rpmspec
RPMSPEC(8) System Manager's Manual RPMSPEC(8)
NAME
rpmspec - RPM Spec Tool
SYNOPSIS
QUERYING SPEC FILES:
rpmspec {-q|--query} [select-options] [query-options] SPEC_FILE ...
select-options
[--rpms]
[--srpms]
query-options
[--qf,--queryformat QUERYFMT]
[--target TARGET_PLATFORM]
QUERY OPTIONS
The general form of an rpm spec query command is
rpm {-q|--query} [select-options] [query-options]
You may specify the format that the information should be printed in. To do this, you use the
--qf|--queryformat QUERYFMT
option, followed by the QUERYFMT format string. See rpm(8) for details.
SELECT OPTIONS
--rpms Operate on the binary package header(s).
--srpm Operate on the source package header(s).
SEE ALSO
popt(3),
rpm(8),
rpmdb(8),
rpmkeys(8),
rpmsign(8),
rpm2cpio(8),
rpmbuild(8),
rpmspec --help - as rpm supports customizing the options via popt aliases it's impossible to guarantee that what's described in the manual
matches what's available.
http://www.rpm.org/ <URL:http://www.rpm.org/>
AUTHORS
Marc Ewing <marc@redhat.com>
Jeff Johnson <jbj@redhat.com>
Erik Troan <ewt@redhat.com>
Panu Matilainen <pmatilai@redhat.com>
Red Hat, Inc 29 October 2010 RPMSPEC(8)