su user in local host w/o password

[hangyu]

There are two user ( userA and userB ) in the same host , I want to let userA can su to userB without input the password , I tried to change ~userB/.rhosts , add "127.0.0.1 userA" to it , but still can't , can advise what can i do ? thx

[RAC_1]

You can't do that with su. You can use sudo or just do an remsh (after setting .rhosts) on same host.

[Patrick Wallek]

Using su as a normal, ie non-root, user will ALWAYS require a password. You can use a utility like sudo to get around this.

http://www.gratisoft.us/sudo/

http://hpux.connect.org.uk/hppd/hpux/Sysadmin/sudo-1.6.8p9/

[hangyu]

thx reply,

except sudo , can use "ssh" to login local user ? thx

[Mel Burslan · Accepted solution]

Yes, you can use ssh for the purpose you need.

while logged in as userA

ssh userB@localhost

gets you to userB's shell, if you have the matching public/private key pair in the right places. (public key should be on one line in the file ~userB/.ssh/authorized_keys and the private key should be ~userA/.ssh/id_dsa)

We us this method to enable our SAP sidadm accounts access orasid accounts at the time of application startup and shutdown. It is especially useful if you keep the same key pair on the multiple servers hosting an SAP instance, so that they can do their transports and what have you, necessary for their operations without us, the sysadmins getting involved all the time.

Hope this helps