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https://github.com/smtkanchana66/linux-bible

Welcome to the Linux Command Bible repository! This guide aims to be a comprehensive resource for learning and mastering Linux commands.
https://github.com/smtkanchana66/linux-bible

bash bash-script bash-script-cheat-sheet bash-scripting cheat-sheets command-line command-line-tool linux linux-terminal linuxcheatsheet linuxcommand linuxcommands terminal terminal-commands

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Welcome to the Linux Command Bible repository! This guide aims to be a comprehensive resource for learning and mastering Linux commands.

Awesome Lists containing this project

README 

          
# Linux Command Bible





  




# Table of Contents



1. [Getting Started](#getting-started)

2. [Basic Commands](#basic-commands)

3. [Git command](#Git-command)

4. [User Management](#User-Management)

5. [System Maintenance](#System-Maintenance)

6. [System Logs](#System-Log)

7. [Process Management](#Process-Management)

8. [Network Management](#Network-Management)

9. [Filesystem Management](#Filesystem-Management)

10. [Security](#Security)

11. [Disk Management](#Disk-Management)

12. [System Performance Monitoring](#System-Performance-Monitoring)

13. [Software Package Management](#Software-Package-Management)

14. [System Backup and Restore](#System-Backup-and-Restore)

15. [System Maintenance and Updates](#System-Maintenance-and-Updates)

16. [Network Configuration and Troubleshooting:](#Network-Configuration-and-Troubleshooting)

17. [Security and Permissions](#Security-and-Permissions)

18. [System Monitoring and Resource Usage2](#System-Monitoring-and-Resource-Usage)

19. [Advanced Process Management](#Advanced-Process-Management)



11. [Contributing](#contributing)

12. [License](#license)



# Getting Started



If you're new to Linux, start here! This section will cover the basics, including how to access the command line and essential concepts.



# Basic Commands



#### Change Directory

```bash

cd [directory]

```

#### List Files

```bash

ls

```

#### Make Directory

```bash

mkdir [directory_name]

```

#### Create a File

```bash

touch [file_name]

```

#### Copy File

```bash

cp [source_file] [destination]

```

#### Move/Rename File

```bash

mv [old_name] [new_name]

```

#### Remove/Delete File

```bash

rm [file_name]

```

#### Open a File in a Text Editor (e.g., Nano):

```bash

nano [filename]

```

#### Open a File in a Text Editor (e.g., vi):

```bash

vi [filename]

```





# Git command



#### Clone a Repository from GitHub:

```bash

git clone https://github.com/username/repository.git

```

#### Check Git Status:

```bash

git status

```

#### Stage your changes:

```bash

git add README.md

```

#### Commit the changes:

```bash

git commit -m "Updated Linux Bible in README.md"

``` 

#### Push the changes to GitHub:

```bash

git push origin master

```

> [!IMPORTANT]

> If you're working on a branch other than master, replace it with the appropriate branch name.

> If this is your first time pushing to the repository, Git may prompt you to configure your username and email:

```bash

git config --global user.email "you@example.com"

git config --global user.name "Your Name"

```

#### Check the status:

```bash

git status

```





# System Administration



#### Display System Information:

```bash

uname -a

```

#### View CPU Information:

```bash

lscpu

```

#### Check Memory Usage:

```bash

free -m

```

#### Disk Space Usage:

```bash

df -h

```





# User Management 



#### Add a User:

```bash

sudo adduser username

```

#### Add a User to the sudo Group:

```bash

sudo usermod -aG sudo username

```

#### Change User Password:

```bash

passwd username

```

#### Delete a User:

``` bash

sudo deluser username

```





# System Maintenance



#### Update Package Lists:

```bash

sudo apt update

```

#### Upgrade Installed Packages:

```bash

sudo apt upgrade

```

#### Install a New Package:

```bash

sudo apt install packagename

```

#### Restart the System:

```bash

sudo reboot

```





# System Logs



#### View System Logs:

```bash

journalctl

```

#### Check Last System Reboot Time:

```bash

last reboot

```





# Process Management



#### List Running Processes:

```bash

ps aux

```

#### Kill a Process:

```bash

kill PID

```

#### Check System Load:

```bash

uptime

```



#### Monitor System Resources:

```bash

top

```







# Network Management



#### Display Network Configuration:

```bash

ifconfig

```

#### Check Open Ports:

```bash

netstat -tuln

```

#### Verify Connectivity:

```bash

ping example.com

```

#### View Network Statistics:

```bash

netstat -s

```





# Filesystem Management



#### Check Filesystem Integrity:

```bash

fsck /dev/sda1

```

#### Find Large Files:

```bash

find / -type f -size +100M

```

> [!NOTE]

>Searches for files larger than 100 megabytes on the system.





# Security



#### Update Security Packages:

```bash

sudo apt-get install unattended-upgrades

```

```bash

sudo dpkg-reconfigure --priority=low unattended-upgrades

```

#### Check for Rootkits:

```bash

rkhunter --check

```

#### Firewall Configuration (using UFW):

```bash

sudo ufw status

```

```bash

    sudo ufw allow 22

```

```bash

sudo ufw enable

```

> [!NOTE]

>Checks the firewall status, allows SSH traffic, and enables the firewall.





# System Information



#### List USB Devices:

```bash

lsusb

```

#### Check PCI Devices:

```bash

lspci

```

> [!NOTE]

>Lists PCI devices connected to the system.





# User and Group Management



#### List All Users:

```bash

getent passwd

```

> [!NOTE]

>Shows a list of all user accounts on the system.



#### List All Groups:

```bash

getent group

```

#### Change User's Primary Group:

```bash

usermod -g newgroup username

```





# Disk Management



#### Check Disk I/O Statistics:

```bash

iostat

```

#### View Filesystem Mount Points:**

```bash

df -hT

```





# System Performance Monitoring



#### Monitor CPU Usage (using `htop`)

```bash

sudo apt install htop

htop

```

> [!NOTE]

>Interactive process viewer that provides a visual representation of CPU and memory usage.



#### Check System Temperature (using `lm-sensors`)

```bash

sudo apt install lm-sensors

sensors

```





# Software Package Management



#### Search for a Package:

```bash

apt search packagename

```

#### Remove Unused Dependencies:

```bash

sudo apt autoremove

```





# System Backup and Restore



#### Create a System Backup (using `tar`):

 ```bash

 tar -cvzf backup.tar.gz /path/to/backup

 ```



#### Restore from Backup:

```bash

tar -xvzf backup.tar.gz -C /path/to/restore

```





# System Maintenance and Updates



#### Check for System Updates (using `apt`):

```bash

sudo apt update

```



### Clean Package Cache:

```bash

sudo apt clean

```

### Monitor System Logs (using `journalctl`):

```bash

journalctl -xe

```





    

# Network Configuration and Troubleshooting



#### Configure Network Interfaces:

```bash

sudo nano /etc/network/interfaces

```

#### DNS Troubleshooting (using `nslookup` or `dig`):

```bash

nslookup example.com

```

or

```bash

dig example.com

```





# Security and Permissions



#### Check File Permissions:

```bash

ls -l filename

```



#### Check System Security Updates (using `unattended-upgrades`):

```bash

cat /var/log/unattended-upgrades/unattended-upgrades.log

```





# System Monitoring and Resource Usage



#### Check System Resource Usage (using `sar`):

```bash

sudo apt install sysstat

sar -u

```

#### Monitor Disk Space Usage (using `du`):

```bash

du -h

```





# Advanced Process Management



#### Monitor Process Resources (using `pidstat`):

```bash

sudo apt install sysstat

pidstat 1

```

#### Background Process Management (using `nohup`):

```bash

nohup command &

```





# License



This Linux Command Bible is licensed under [Apache-2.0 license]. See the [LICENSE](LICENSE) file for details.