Solution : https://service.sap.com/sap/support/notes/306408 (SAP Service marketplace login required)
Key words : 
<patch id>_<oracle release>_<platform>, $cd <opatch directory>  $opatch query -is_rolling  query, <patch_id>_<action>_<yyyymmdd>, $ cd /oracle/patches$ unzip <patch_file>$ ls -, html#perl oracle9i release 2 cd, patches automatic conflict resolution overview, specific opatch command   $<perl> ~/opatch/opatch, pl apply <patch_location>$ <perl> opatch/opatch, pl apply <patch_location>   $<perl> ~/opatch/opatch, pl lsinventory opatch command overview
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