system_engineering-devops part 2

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

10-mirror_permissions

#!/bin/bash
chmod --reference=olleh hello

11-directories_permissions

#!/bin/bash
chmod a+X *

12–directory_permissions

#!/bin/bash
mkdir -m 751 my_dir

13-change_group

#!/bin/bash
chgrp school hello

Advance

100-change_owner_and_group

#!/bin/bash
chown vincent:staff *

101-symbolic_link_permissions

#!/bin/bash
chown -h vincent:staff _hello

102-if_only

#!/bin/bash
chown --from=guillaume betty hello

103-Star_Wars

#!/bin/bash
telnet towel.blinkenlights.nl

README.md

echo 'repo description here' > README.md

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

See part 1: system_engineering-devops Part 1