system_engineering-devops/0x01-shell_permissions Part 1

0x01-shell_permissions

Applied Commands

• What do the commands chmod, sudo, su, chown, chgrp do
• Linux file permissions
• How to represent each of the three sets of permissions (owner, group, and other) as a single digit
• How to change permissions, owner and group of a file
• Why can’t a normal user chown a file
• How to run a command with root privileges
• How to change user ID or become superuser

Other uses

• How to create a user
• How to create a group
• How to print real and effective user and group IDs
• How to print the groups a user is in
• How to print the effective userid

0-iam_betty

!/bin/bash
su betty

1-who_am_i

!/bin/bash
whoami

2-groups

#!/bin/bash
groups

3-new_owner

#!/bin/bash
chown betty hello

4-empty

#!/bin/bash
touch hello

5-execute

#!/bin/bash
chmod u+x hello

6-multiple_permissions

#!/bin/bash
chmod ug+x,o+r hello

7-everybody

#!/bin/bash
chmod a+x hello

8-James_Bond

#!/bin/bash
chmod 007 hello

9-John_Doe

#!/bin/bash
chmod 753 hello

README.md

echo 'repo description here' > README.md

If you have any questions please leave it on the comment box bellow.

See part 2: system_engineering-devops Part 2