How to list the current user in sqlplus and how to switch to another?

Assume I am in a sqlplus sesion.
How can I display the user with whom I am currently working?
And how can I switch (without leaving the sqlplus session) to another
user aaa with pw=mypw?
Peter

By using host command
Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.5.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> host su oracle
Password:
[oracle@backup root]$ exit
exit
SQL>From Documentation:
*HOST [ command ] - Execute host commands*
http://download.oracle.com/docs/cd/B19306_01/server.102/b14195/sqlqraa.htm#sthref1972
Kamran Agayev A. (10g OCP)
http://kamranagayev.wordpress.com

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How to list the current user in sqlplus and how to switch to another?

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