📈 Beyond Basics: Using Advanced Linux 🐧 Commands

👉 Quick Intro 🔥

In this blog, I will explain advanced commands related to:-

1. Process management

2. Package management

3. System information

4. Networking commands

👉 Process Management ⚙️

• As Linux is multiuser & multitasking OS it has multiple processes running at same

• To get data on all those processes we have ps command

• To find which services are running on which ports on, you can use netstat -tuln

  

1. Display Processes

   ps --> View running processes

   🚩 FLAGS

   -A --> View all running processes

   -e --> View all running processes

   -f --> View full-format listing

   -a --> View all processes except session leaders & not associated with terminal

   -x --> View all processes owned by you

   ps -ef --> View all running processes in a detailed format. [most commonly used]

   

   ps -aux --> View all running processes owned by you in a detailed format

2. Find Process

   To find a particular running process you can use pipe with grep command

   

   You can get PID in the second column

3. Kill Process

   To kill process kill command is used

   kill PID --> Kill process using PID

   

   kill <signal> PID --> Kill process with some extra signal

   🚦 SIGNALS

   | SIGKILL | 9 | It kills signal forcefully without any cleanup activities. | | --- | --- | --- | | SIGTERM | 15 | Before terminating the process, it does some cleanup activities. |

   kill -9 PID OR kill -SIGKILL PID

   

   

   kill -15 PID OR kill -SIGTERM PID

   

   kill -l --> Display all signals

   

👉 Package Management 📦

• Different distros have different package managers

  yum for Amazon Linux / Cent OS / Red Hat

  apt and apt-get for Ubuntu / Debian

  deb

sudo apt update -y --> Update existing packages

sudo apt search <package-name> --> Search package

sudo apt install <package-name> -y --> Install new package

sudo apt remove <package-name> -y --> Uninstall package

cat /etc/apt/sources.list --> This file has all repositories from where packages are downloaded

👉 System Information 💻

• uname gives general information about OS, architecture & system

  🚩 FLAGS

  -a --> Print all data

  -s --> Give kernel name

  -n --> Hostname

  -r --> Kernel release date

  -v --> Version of the current kernel

  -m --> Machine hardware name

  -p --> Type of processor

  -i --> Platform of hardware

  -o --> Name of OS

  

• df is used to get storage-related data of all mounted file systems

  

• du command gives file and directory space usage

  🚩 FLAGS

  -a --> Include all files and directories, including hidden ones

  -c --> Give total disk usage in addition to individual ones

  -h --> Human readable sizes

  --time --> Give the last modified time also

  

• lsblk gives data of block devices and mounted storages

  

• uptime is used to find out how long the system is running

  🚩 FLAGS

  -p --> Human readable

  -s --> Starting date & time

  

• lscpu gives all the details about the CPU

👉 Networking 🌐

• ping <URL/IP> is used to check if the server is running

  

• ifconfig gives details about interfaces and private IP address

  

• netstat displays network-related information such as network connections, routing tables, interface statistics, etc.

• wget is a non-interactive network downloader that is used to download files

  

  🚩 FLAGS

  -b --> Download in background [this creates a logfile]

  -c --> Resume partially downloaded file

  

Happy Learning!!! 👋