How to Find Oracle Applications version

Version of a Oracle Applications Form (fmx) or report
strings -a | grep Header
alternatively you can also use the adident command

Version of a Java class File
To find the version of a java class file $ strings | grep '$Header'

JAVA version
$ java -version

How to find the Apache version?
Go to the $iAS/Apache/Apache/bin directory and enter the following command:
$ httpd -version

Version Of The OA Framework
To find out the version of your Oracle appplication Framework
http://[host].[domain]:[portnumber]/OA_HTML/OAInfo.jsp

OA Framework Version Information

OA Framework Version	11.5.10.K.
MDS Version	9.0.3.8.9 (build 1050)
UIX Version	2.2.13
BC4J Version	9.0.3.12.53

Oracle Application Product Version or Patch Set Level.
select patch_level from fnd_product_installations where patch_level like '%AD%';

WorkFlow Version
select TEXT Version from WF_RESOURCES where TYPE = 'WFTKN' and NAME = 'WF_VERSION';
VERSION
--------------------------------------------------------------------------------
2.6.0

How to find Oracle Database Components version

Oracle RDBMS Version
SELECT * FROM V$VERSION;

Version of OPATCH
$ perl $ORACLE_HOME/OPatch/opatch.pl version

Listener Version
$ lsnrctl version

How to find Operating Systems and Utilities version

Sun Solaris Version
To check the version of you Solaris you can use the following file.
$ cat /etc/release
Solaris 8 2/02 Fujitsu_3 s28s_u7fjsv3wos_04 SPARC
Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
Assembled 08 December 2002

RedHat Linux Version
You can check the version and release of Linux from the following file

view /etc/redhat-release
Red Hat Enterprise Linux AS release 4 (Nahant Update 2)

Perl Version
You can use the perl -v or the perl - version command to find out the version of perl on your environment.
$ perl -version

Java Version
To fine the version of Java used
$ java -version

Version of Installed packages on Solaris
To find the version of the packages on Solaris
$ pkginfo -i|grep perl

Version of Installed packages on Linux
To find the version of the packages on linux
rpm -qa|grep

Kernel Version of Unix
You can find the version of your kernel on UNIX by the following command
uname -a

Bit of Operating System
You can check the bit size of your OS by using the following command
$ isainfo -b

Bit of your Oracle Software
To check if your Oracle Binary is 32 bit or 64 bit you can use the file command on any of the oracle executables like
$ file $ORACLE_HOME/bin/oracle

Finding Oracle data block size

SQL> SHOW PARAMETER DB_BLOCK_SIZE

Finding O/S block size

df -g | grep "block size" (in Solrieas)