If you use DB2 Connect to access the z/OS database from the Linux machine, you should be able to run the export command against the z/OS table, and it will be in DB2 LUW format. You may have to specify the code page on the export command as an option (see Export command in the DB2 LUW Command Reference manual). You will probably have to do a remote bind of utilities from Linux to the z/OS database using an Id that has sysadm on DB2 z/OS.