0x01-shell_permissions

Shell Permissions

This section focuses on shell scripts related to file and directory permissions in Unix-like systems.

Table of contents:

1. Mandatory Scripts

2. Advanced Scripts

Mandatory Scripts:

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0-iam_betty

This script switches the current user to "betty" using the su command.

#!/bin/bash
su betty

1-who_am_i

• This script prints the current username using the whoami command.

#!/bin/bash
whoami

2-groups

• This script displays the groups to which the current user belongs using the groups command.

#!/bin/bash
groups

3-new_owner

• This script changes the owner of the file "hello" to "betty" using the sudo chown command.

#!/bin/bash
sudo chown betty hello

4-empty

• This script creates an empty file named "hello" using the touch command.

###
#!/bin/bash
touch hello

5-execute

• This script adds execute permission for the owner of the file "hello" using the sudo chmod command.

#!/bin/bash
sudo chmod u+x hello

6-multiple_permissions

• This script sets specific permissions (754) for the file "hello" using the sudo chmod command.

#!/bin/bash
sudo chmod 754 hello

7-everybody

• This script grants execute permission to everyone for the file "hello" using the sudo chmod command.

#!/bin/bash
sudo chmod ugo+x hello

8-James_Bond

• This script sets specific permissions (007) for the file "hello" using the sudo chmod command.

#!/bin/bash
sudo chmod 007 hello

9-John_Doe

• This script sets specific permissions (753) for the file "hello" using the sudo chmod command.

#!/bin/bash
sudo chmod 753 hello

10-mirror_permissions

• This script copies permissions from the file "olleh" to "hello" using the sudo chmod --reference command.

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

11-directories_permissions

• This script adds execute permissions to all files and directories in the current directory using the sudo chmod command.

#!/bin/bash
sudo chmod +X *

12-directory_permissions

• This script creates a directory named "my_dir" with specific permissions (751) using the mkdir --mode command.

#!/bin/bash
mkdir --mode=751 my_dir

13-change_group

• This script changes the group of the file "hello" to "school" using the sudo chgrp command.

#!/bin/bash
sudo chgrp school hello

Advanced Scripts:

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100-change_owner_and_group

• This script changes the owner to "vincent" and the group to "staff" for all files in the current directory using the sudo chown command.

#!/bin/bash
sudo chown vincent:staff *

101-symbolic_link_permissions

• This script changes the owner and group of the symbolic link "_hello" to "vincent:staff" using the chown -h command.

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

102-if_only

• This script changes the owner of the file "hello" from "guillaume" to "betty" using the sudo chown --from command.

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

103-Star_Wars

• This script plays an ASCII Star Wars episode in the terminal using the telnet command.

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