I. finger command
1. Role: Display User information in the system
2. Format: finger [option] user
Common options
-L multi-line display (login name, real name, email, Logon Time, and other information)
-S single row display (login name, real name, etc)
-M [user] Only displays information of one user
Ii. w command
1. Purpose: display all online users currently logged on to the platform and what they are doing
2. Format: w [option] [user]
Common options
-H skip header
-L long listing (default)
-S short listing
Iii. who instructions
1. function: displays all online users currently logged on to the host.
2. Format: who [option] [FILE | ARG1 ARG2]
Common options:
-A: displays all information.
-D print dead processes
-R print current run level
-B print the time of last system boot
-Q: displays the current online user name and counts the number of online users
-S only displays the user name, time, terminal used, and logon IP address.
-L display the system logon process (which tty is used)
Iv. user commands
Purpose: display all online users currently logged on to this host.