Cheat Sheet for DevOps Engineers on Linux & Git Commands

Linux Command Line Cheat Sheet

pwd: Print current working directory
ls: List files and directories
- ls -l: Detailed list view
- ls -a: Show hidden files
cd: Change directory
- cd ~: Home directory
- cd ..: Parent directory
mkdir: Create a directory
rmdir: Remove an empty directory

Search 🔍

grep: Search for a pattern in files
- grep pattern file: Search in a file
- grep -r pattern dir: Recursively search in a directory
find: Search for files and directories
- find dir -name file: Search for a file in a directory

File System 📁

df: Display disk space usage
du: Display file/directory space usage
- du -h: Human-readable format
mount: Mount a file system
umount: Unmount a file system
ln: Create symbolic/hard links
- ln -s source link: Create a symbolic link

File Permission 🔐

chmod: Change file permissions
- chmod ugo +/- rwx file: Modify permissions
chown: Change file ownership
- chown user:group file: Change ownership

Network 🌐

ifconfig or ip addr: Display network interfaces
ping: Test network connectivity
- ping google.com: Ping a host
netstat or ss: Network statistics
ssh: Securely connect to a remote server
- ssh user@host: Connect to a remote host

File Management 📂

cp: Copy files/directories
- cp source destination: Copy files
- cp -r source_dir destination_dir: Copy directories
mv: Move/Rename files/directories
- mv old new: Rename file/directory
rm: Remove files/directories
- rm file: Remove a file
- rm -r dir: Remove a directory

File Compression 📦

tar: Create/Extract tar archives
- tar -cvf archive.tar files: Create an archive
- tar -xvf archive.tar: Extract an archive
gzip/gunzip: Compress/Decompress files
- gzip file: Compress a file
- gunzip file.gz: Decompress a file

File Editors ✏️

nano: Simple terminal text editor
vim/vi: Powerful terminal text editor
- Press i to insert, Esc to exit insert mode, :wq to save and exit

Directory Utilities 📙

tree: Display directory structure
- tree dir: Show structure of a directory

Scripting 📜

Shebang: #!/bin/bash (at the beginning of script)
Variables: variable_name=value
Conditions: if, else, elif
Loops: for, while
Functions: function_name() { ... }

Memory and Process 🧠

top: Display real-time system information
ps: Display running processes
- ps aux: Detailed process list
kill: Terminate a process
- kill PID: Terminate a process by PID

Disk Utilities 💽

fdisk: Disk partitioning utility
mkfs: Create a file system on a partition
- mkfs.ext4 /dev/sdX: Create ext4 file system
dd: Copy data from one source to another
- dd if=source of=destination bs=block_size

🚀 Ultimate Git & GitHub Cheat Sheet for DevOps Engineers 🚀

Git Basics 📜

git init 🎉 - Initialize a new Git repository in the current directory.
git clone <repository-url> 📥 - Clone a remote repository to your local machine.
git add <file> ➕ - Stage changes for commit.
git commit -m "commit message" 💬 - Commit staged changes with a descriptive message.
git status 📊 - View the status of your working directory.
git log 📝 - Display commit history.
git diff 🔍 - Show differences between your working directory and the last commit.
git branch 🌿 - List all branches in the repository.
git checkout <branch> 🔄 - Switch to a different branch.
git merge <branch> 🤝 - Merge changes from one branch into the current branch.
git pull 🔄 - Fetch remote changes and integrate them into the current branch.
git push 🚀 - Push local changes to a remote repository.

GitHub Collaboration 🤝

git remote add origin <repository-url> 📌 - Link your local repository to a remote on GitHub.
git remote -v 📡 - View remote repositories associated with your local repo.
git pull origin <branch> 🔄 - Pull and integrate remote changes into your local branch.
git push origin <branch> 🚀 - Push local commits to a remote branch on GitHub.
git branch -d <branch> 🗑️ - Delete a local branch.
git push origin --delete <branch> 🗑️ - Delete a remote branch on GitHub.
git fork 🍴 - Create a copy of a repository under your GitHub account.
git pull-request 🔄 - Initiate a pull request to merge your changes into the main repository.
git merge <pull-request-branch> 🔄 - Merge a pull request into the main branch.

Git Advanced 🚀

git rebase <branch> 🔄 - Combine commits from one branch onto another.
git cherry-pick <commit> 🍒 - Apply a specific commit to your current branch.
git stash 📦 - Temporarily save changes that you don't want to commit immediately.
git reset <file> 🔙 - Unstage changes in a file.
git reset --hard <commit> 🔙🔙 - Reset your branch and working directory to a previous commit.
git blame <file> 🔍 - Find out who made changes to a specific file and when.
git tag <tag-name> 🏷️ - Create a tag for a specific commit (e.g., for releases).

Remember, this cheat sheet provides only a brief overview. For in-depth usage and options, consult the respective command's manual pages (man command).

Feel free to customize and expand upon this cheat sheet as needed. Happy learning! 🎉

That's all for today, stay tuned for more updates!

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Cheat Sheet for DevOps Engineers on Linux & Git Commands | #Day12 #90daysof devops

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