Energy Hub Base

Tutorial 1-3

Q1 Advanced User Creation and Delete

Create a user named test with home directory
Create a user named finley. This user should have a comment (GECOS field) that reads "Financial Auditor". Ensure the user is created without a home directory.
Verify all users' creation
Verify user is created with/without a home directory
Delete all the users, even in home directory

Solution

sudo useradd test
sudo useradd -c "Financial Auditor" -M finley
grep finley /etc/passwd
ls /home

sudo userdel -r test

sudo userdel -r finley

Q2 Searching the Manual

Find the manual page that describes the configuration file for the local password database (not the command to change the password, but the file where user information is stored).
Identify the section number (e.g., 1, 5, or 8)

Solution

man -k password | grep file --> Found passwd (5) = Section 5 contain password files
man 5 passwd

Q3 Vim Text Recording

Create a file named /home/anil/list.txt.
The file must contain 10 lines.
- Lines 1 through 5 should say "Primary".
- Lines 6 through 10 should say "Secondary".
Use vim recording.

Solution

Create user anil at home directory
- sudo useradd anil
Check user created or not
- grep anil /etc/passwd
- ls /home
Create Password
- sudo passwd anil
Switch user
- su - anil
Open vim
- vim
Press Esc to make sure in Normal Mode
Insert 10 lines
- 10i --> Enter --> Esc
Get back to top
- gg
Start recording a
- qa
Insert mode
- I
Type Primary
Quit Insert mode
- Esc
Move to next line
- j
End recording
- q
Run recording a
- 4@a
Start recording b
- qb
Insert mode
- I
Type Secondary
Quit Insert mode
- Esc
Move to next line
- j
End recording
- q
Run recording b
- 4@b
Press Esc to make sure in Normal Mode.
Save as list.txt
- :w list.txt
Exit vim
- q!
Check file
- ls

Q4 Bulk Directory Creation

Within the /tmp directory, create a directory structure that looks like this: deploy/scripts/backup.
You must create all three levels with a single command.

Solution

Back to root directory
- cd /
Check tmp directory
- ls
Direct to tmp directory
- cd tmp
Create directory
- -p means parent directory, create if parent (/deploy & /script) directory is missing
- mkdir -p deploy/scripts/backup
Check directory
- ls

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