ORACHK  VERSION: 12.1.0.2.3_20150305
THIS IS A WINDOWS 2012 SERVER (Cygwin64 Terminal)
$ ./orachk -a
"This version of orachk was released on 05-Mar-2015 and its older than 120 days. No new version of orachk is available in RAT_UPGRADE_LOC. It is highly recommended that you download the latest version of orachk from my oracle support to ensure the highest level of accuracy of the data contained within the report."
Downloaded and copy new verison in $ORACLE_HOME/suptools...
Try to update:
$ ./orachk -upgrade
Use of uninitialized value $selectedpath in split at /cygdrive/d/orachk/.cgrep/auto_upgrade.pl line 263.
cp: cannot stat '/cygdrive/d/orachk//-check': No such file or directory