Hey Damodar,
The OS level access can be done using user <SID>adm.
In Unix you will have to use complete command prompt for access files and directory structure of SAP.
1. Logon to unix using Telnet, direct terminal access or ssh.
2. User <SID>adm and its password
3. It will take you to /usr/sap/ folder
4. Then as per standard directory structure of SAP you can locate the files.
5 To start and Stop SAP you can use command stopsap r3 and startsap r3. If you use stopsap and startsap it will completely bring down both db as well as application server. The commands stopsap r3 and startsap r3 will just work with application server the db will not be affected.
6. To see the trace files or log files go to the work directory like cd /usr/ SAP/<SID>/DVEGBMS<instance number>/work
Type ls -lrt to list all the files in the directory. To see the content of trace files type more dev_w0 you can see the content by pressing space bar you can move page wise too.
SAPGUI part:
If you have SAPGUI installed on your windows desktop then if you are in same subnet or if you know the hostname or IP addess of SAP system
You go to run type sapgui <hostname / IP address of SAP server> <instance number>
This will open you SAP in SAPGUI mode.
Kindly look for some UNIX tutorials on web for some useful commands for basic administration tasks.
Thanks & Regards
Vivek
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