Oracle OPatch

To download the latest OPatch version from My Oracle Support (MOS) using the next reference:
Patch 6880880.
Or 
using the next URL:
https://updates.oracle.com/download/6880880.html

2) In the "Platform" field select the relevant platform that corresponds to the Oracle product.

3) Click the Download button

4) Upload the opatch.zip file to your OS host and unzip it:

Example:
  $ mv p6880880_11107_SOLARIS64.zip $ORACLE_HOME
  $ cd $ORACLE_HOME
 (If a former OPatch directory already exist, then rename it)                                                                   
  $ mv OPatch OPatch_old
  $unzip p6880880_101000_SOLARIS64.zip

 5) To check the Opatch vesion
$ $ORACLE_HOME/OPatch/opatch version

for more opatch help

Useful MOS IDs
1. Master Note For OPatch (Doc ID 293369.1)