You can change the error log path by editing the $SYBASE/$SYBASE_ASE/install/RUN_server_name file.
For example, to change the error log path from $SYBASE/$SYBASE_ASE/bin/dataserver -d/Devices/ASE_2K.dat -sASE_2K -i/ASE_150 -e$SYBASE/$SYBASE_ASE/install/ASE_2K.log -M/ASE_150 to the $SYBASE directory, type:
$SYBASE/ASE-15_0/bin/dataserver -d/Devices/ASE_2K.dat -sASE_2K -i/ASE_150 -e$SYBASE/ASE_2K.log -M/ASE_150
For information about using the RUN_server_name file, see “Starting and Stopping Servers”, and the Utility Guide.