🐧 The Ultimate Linux & Git-GitHub Cheat Sheet for DevOps 🛠️
This cheat sheet will cover Linux commands, Git commands, and GitHub essentials, with descriptions, examples, and real-world relevance.
🐧 Linux Commands for Everyday Use
| Command | Description | Example |
whoami | Displays the current logged-in user. | whoami |
uname -r | Displays the Linux kernel version. | uname -r |
df -h | Shows disk usage in a human-readable format. | df -h |
du -sh [directory] | Shows the size of a directory or file. | du -sh /home/user |
ls -la | Lists all files and directories with detailed information. | ls -la |
pwd | Prints the current working directory. | pwd |
mkdir [directory] | Creates a new directory. | mkdir project_folder |
rm -rf [directory/file] | Deletes files or directories (use with caution). | rm -rf old_files |
chmod [permissions] [file] | Changes file permissions. | chmod 755 script.sh |
chown [user]:[group] [file] | Changes ownership of a file or directory. | chown user:group file.txt |
ps -aux | Displays all running processes. | ps -aux |
kill [process_id] | Terminates a process by its PID. | kill 1234 |
history | Shows command history. | history |
alias [name]='[command]' | Creates a shortcut for a command. | alias ll='ls -la' |
curl [url] | Fetches data from a URL. | curl https://example.com |
wget [url] | Downloads a file from a URL. | wget https://example.com/file.zip |
scp [file] [user@host:/path] | Securely copies files between local and remote systems. | scp file.txt user@192.168.1.1:/tmp |
ssh [user@host] | Connects to a remote server via SSH. | ssh user@192.168.1.1 |
🔍 Text Processing Commands.
| Command | Description | Example |
find [directory] -name "[name]" | Searches for files by name. | find /home -name "*.txt" |
awk '/pattern/ {action}' [file] | Processes text based on patterns in files. | awk '/error/ {print $2}' log.txt |
sed -i 's/[old]/[new]/g' [file] | Finds and replaces text in a file. | sed -i 's/foo/bar/g' file.txt |
sort [file] | Sorts lines in a file. | sort data.txt |
uniq [file] | Removes duplicate lines from a file. | uniq data.txt |
wc -l [file] | Counts the number of lines in a file. | wc -l file.txt |
grep [pattern] [file] | Searches for a pattern in a file. | grep "error" log.txt |
crontab -e | Edits the crontab to schedule recurring tasks. | crontab -e |
🌐 Networking Commands
| Command | Description | Example |
ping [host] | Tests connectivity to a server. | ping google.com |
netstat -tuln | Displays open ports and network connections. | netstat -tuln |
ip a | Displays IP address and network details. | ip a |
scp [file] [user@host:/path] | Copies files between local and remote systems. | scp backup.zip user@192.168.1.1:/tmp |
ssh [user@host] | Connects to a remote server via SSH. | ssh user@192.168.1.1 |
curl -I [url] | Fetches HTTP headers for a URL. | curl -I https://example.com |
🛠️ Git Essentials
| Command | Description | Example |
git init | Initializes a Git repository in the current directory. | git init |
git clone [url] | Creates a local copy of a remote repository. | git clone https://github.com/user/repo.git |
git status | Shows the status of changes in the working directory. | git status |
git add [file] | Stages a file for commit. | git add README.md |
git commit -m "[message]" | Saves staged changes with a commit message. | git commit -m "Initial commit" |
git push origin [branch] | Pushes changes to the remote repository. | git push origin main |
git pull origin [branch] | Fetches and merges changes from a remote repository. | git pull origin main |
git branch | Lists all branches in the repository. | git branch |
git checkout -b [branch] | Creates and switches to a new branch. | git checkout -b feature-branch |
git merge [branch] | Merges a branch into the current branch. | git merge feature-branch |
git log | Displays the commit history. | git log |
🌟 GitHub Essentials
| Action | Description | Steps |
| Create a Repository | Sets up a new repository on GitHub. | Go to GitHub → Click on "New" → Fill details. |
| Clone a Repository | Copies an existing repository to your local system. | git clone [url] |
| Push Changes | Updates the remote repository with local changes. | git push origin main |
| Pull Requests | Proposes changes to a branch. | Navigate to your branch → Click "Pull Request". |