List logged in users (name, terminal, logintime)

Question

I'm trying to print a list of users, who are currently logged on a terminal. It should look like this:

I only got this so far:

I'm missing the Terminal and the Login time. How can I display them? This is what I got so far:

#!/bin/bash
NOWDATE=$(date +"%Y-%m-%d")
NOWTIME=$(date +"%T")
USERS=$(who | cut -d " " -f1)
TERMINAL=0
LOGIN=0

for u in $USERS
do
    echo "$NOWDATE""_""$NOWTIME User: " $u
done

Answer 1

Parsing the output of w is probably a better approach than who. Here are some representative data, which shows the login time:

$ who
tom      pts/1        2015-11-15 06:39 (michener:S.0)
$ w
 06:40:10 up  1:04,  1 user,  load average: 0.00, 0.01, 0.05
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
tom      pts/1    michener:S.0     06:39    2.00s  0.03s  0.00s w

Those are more widely available than finger. Since this is a classroom exercise, parsing the data is left to OP. As a hint, awk can do more than print its fields in a one-liner:

• Typically, one would handle the output of w by having in the awk script a BEGIN section (to set a line-number or state).
• Then, a default action for each line (just curly braces with no pattern) would increment the line number.
• Using the line number, handle the first line specially (skip it in this case: OP may need the number of users for a report header, but that is not used in OP's example), and skip the line with USER.
• After that, each line can be printed as OP needs. awk will quit when there is no more data; it is not necessary to know the number of users to do this.

If OP is told to use who, that has options to list more information, e.g.,

$ who -l -u
LOGIN    tty5         2015-11-15 05:36              3670 id=5
LOGIN    tty6         2015-11-15 05:36              3671 id=6
LOGIN    tty4         2015-11-15 05:36              3669 id=4
LOGIN    tty3         2015-11-15 05:36              3668 id=3
LOGIN    tty2         2015-11-15 05:36              3667 id=2
LOGIN    tty1         2015-11-15 05:36              3666 id=1
tom      pts/1        2015-11-15 06:39 00:06        5780 (michener:S.0)
tom      pts/2        2015-11-15 06:52   .          6078 (michener:S.1)

again, showing the terminal name and the login times.

Answer 2

No need of bash script. you can use finger command. It will give complete information about all login users.

Just open your terminal and type finger. you will get what you need. If you want to know more about what finger can do read here