How to extend tempdb in SYBASE ASE 15.7???

Dear ASE experts,

I am getting error like this while taking backups or my abaper activating table EKKO :

I/O error detected during read

for BUF pointer = '0xd1942200', MASS pointer =

I have found a solution in SAP note

https://launchpad.support.sap.com/#/notes/1955596/E

But i dont no how to increase tempdb in sysbase 15.7 on Linux.

Please help me with the syntax to extend tempdb and saptools in sybase

Regards