SQL ,PLSQL , Unix

whoami The command lets you know the user name of the current shell you are at. Example: root@Microknoppix:/home/knoppix# whoami root root@Microknoppix:/home/knoppix# su knoppix knoppix@Microknoppix:~$ whoami knoppix su The su command is used to become another user during a login session. Invoked without a username, su defaults to becoming the superuser. The optional argument - may be used to provide an environment similar to what the user would expect had the user logged in directly. Example : root@Microknoppix:/home/knoppix# su knoppix password: knoppix@Microknoppix:~$ knoppix@Microknoppix:/root$ su - password: root@Microknoppix:~# knoppix@Microknoppix:/root$ su password: root@Microknoppix:~# finger The finger displays information about the system users. Example: root@Microknoppix:~# finger knoppix Login: knoppix Name: Knoppix User Directory: /home/knoppix Shell: /bin...