11-18-2010
unless you are coding based on POSIX standards it doesn't matter what platform your are using. all of them will do the trick.
"Advanced Programming in the UNIX Environment" is one of the best (no i think the best) books for this problem.
This User Gave Thanks to majid.merkava For This Post:
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LEARN ABOUT FREEBSD
freebsd-version
FREEBSD-VERSION(1) BSD General Commands Manual FREEBSD-VERSION(1)
NAME
freebsd-version -- print the version and patch level of the installed system
SYNOPSIS
freebsd-version [-ku]
DESCRIPTION
The freebsd-version utility makes a best effort to determine the version and patch level of the installed kernel and / or userland.
The following options are available:
-k Print the version and patch level of the installed kernel. Unlike uname(1), if a new kernel has been installed but the system
has not yet rebooted, freebsd-version will print the version and patch level of the new kernel.
-u Print the version and patch level of the installed userland. These are hardcoded into freebsd-version during the build.
If both -k and -u are specified, freebsd-version will print the kernel version first, then the userland version, on separate lines. If nei-
ther is specified, it will print the userland version only.
IMPLEMENTATION NOTES
The freebsd-version utility should provide the correct answer in the vast majority of cases, including on systems kept up-to-date using
freebsd-update(8), which does not update the kernel version unless the kernel itself was affected by the latest patch.
To determine the name (and hence the location) of a custom kernel, the freebsd-version utility will attempt to parse
/boot/defaults/loader.conf and /boot/loader.conf, looking for definitions of the kernel and bootfile variables, both with a default value of
``kernel''. It may however fail to locate the correct kernel if either or both of these variables are defined in a non-standard location,
such as in /boot/loader.rc.
ENVIRONMENT
ROOT Path to the root of the filesystem in which to look for loader.conf and the kernel.
EXAMPLES
To determine the version of the currently running userland:
/bin/freebsd-version -u
To inspect a system being repaired using a live CD:
mount -rt ufs /dev/ada0p2 /mnt
env ROOT=/mnt /mnt/bin/freebsd-version -ku
SEE ALSO
uname(1), loader.conf(5), freebsd-version(8)
HISTORY
The freebsd-version command appeared in FreeBSD 10.0.
AUTHORS
The freebsd-version utility and this manual page were written by Dag-Erling Smorgrav <des@FreeBSD.org>.
BSD
October 5, 2013 BSD