COPERR
This CLI environment variable is used by CLI to determine the location of the errmsg.cat file. This is used by CLI on UNIX platforms only. If this variable is not set to the location where the errmsg.cat file exists and the file does not exist in /usr/lib, CLI prints the following message on STDOUT and then exits:
CLI:Message catalog open failed!: No such file or directory
The file “errmsg.cat” cannot be opened.
There may be problems with your installation.
Exiting...
On UNIX platforms, CLI installation places an entry in /etc/profile and sets the value of this environment variable to the installation directory.