Roles and formats of finger, who, w, and users commands

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.