> For the complete documentation index, see [llms.txt](https://mainekhacker-1.gitbook.io/mainekhacker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mainekhacker-1.gitbook.io/mainekhacker/linux-commands-checklists.md).

# linux Commands CheckLists:

## linux Commands

**Beginners**

* Beginners

## 💻 Kali Linux Basics: Cheat Sheet for Beginners

November 05, 2024

***

### 🧭 Navigation & Directory Management

| Command               | Description                         | Example                   |
| --------------------- | ----------------------------------- | ------------------------- |
| `pwd`                 | Print current directory             | `pwd`                     |
| `ls`                  | List directory contents             | `ls`                      |
| `ls -l`               | List contents with details          | `ls -l`                   |
| `ls -a`               | Include hidden files in listing     | `ls -a`                   |
| `cd [directory]`      | Change directory                    | `cd Documents`            |
| `cd ..`               | Move up one directory               | `cd ..`                   |
| `cd ~`                | Go to the home directory            | `cd ~`                    |
| `mkdir [folder_name]` | Create a new directory              | `mkdir new_folder`        |
| `rm [file]`           | Delete a file                       | `rm file.txt`             |
| `rm -r [directory]`   | Remove a directory and contents     | `rm -r old_folder`        |
| `cp [source] [dest]`  | Copy files or directories           | `cp file1.txt file2.txt`  |
| `mv [source] [dest]`  | Move or rename files or directories | `mv file.txt newname.txt` |

### 📝 File Operations

| Command                | Description                      | Example               |
| ---------------------- | -------------------------------- | --------------------- |
| `cat [file]`           | Display file contents            | `cat notes.txt`       |
| `less [file]`          | View contents with scroll option | `less notes.txt`      |
| `head -n [num] [file]` | Show the first n lines of a file | `head -n 5 notes.txt` |
| `tail -n [num] [file]` | Show the last n lines of a file  | `tail -n 5 notes.txt` |
| `nano [file]`          | Open file in nano editor         | `nano notes.txt`      |
| `vim [file]`           | Open file in vim editor          | `vim notes.txt`       |

### 🔍 Search for Files and Text

| Command                        | Description                            | Example                     |
| ------------------------------ | -------------------------------------- | --------------------------- |
| `find [path] -name [filename]` | Find files by name in a path           | `find / -name file.txt`     |
| `locate [filename]`            | Quickly locate files (uses index)      | `locate file.txt`           |
| `grep '[text]' [file]`         | Search text within a file              | `grep 'error' log.txt`      |
| `grep -r '[text]' [dir]`       | Recursively search text in a directory | `grep -r 'error' /var/logs` |

### 📦 Package Management with APT

| Command                      | Description                                | Example                 |
| ---------------------------- | ------------------------------------------ | ----------------------- |
| `sudo apt update`            | Refresh list of available packages         | `sudo apt update`       |
| `sudo apt upgrade`           | Install updates for all installed packages | `sudo apt upgrade`      |
| `sudo apt install [package]` | Install a specific package                 | `sudo apt install vim`  |
| `sudo apt remove [package]`  | Uninstall a specific package               | `sudo apt remove vim`   |
| `dpkg -i [file.deb]`         | Manually install a .deb package            | `dpkg -i mypackage.deb` |

### 🔒 Permissions and Ownership

| Command                         | Description                                 | Example                       |
| ------------------------------- | ------------------------------------------- | ----------------------------- |
| `chmod [mode] [file]`           | Change permissions (rwx) for a file         | `chmod 755 script.sh`         |
| `chown [user]:[group] [file]`   | Change ownership of a file or directory     | `chown root:staff file.txt`   |
| `chown -R [user]:[group] [dir]` | Change ownership for directory and contents | `chown -R user:user /project` |

Each number in `chmod` represents permissions for Owner, Group, and Others:

| Number | Permissions | Meaning              |
| ------ | ----------- | -------------------- |
| 7      | `rwx`       | Read, Write, Execute |
| 5      | `r-x`       | Read, Execute        |
| 6      | `rw-`       | Read, Write          |
| 4      | `r--`       | Read only            |

Examples:

* `chmod 755 file.sh` → Owner has full access (`7` = `rwx`); group and others can read and execute (`5` = `r-x`).
* `chmod 644 file.sh` → Owner can read and write (`6` = `rw-`); group and others can only read (`4` = `r--`).

### 📊 System Monitoring

| Command              | Description                              | Example        |
| -------------------- | ---------------------------------------- | -------------- |
| `top`                | Monitor running processes in real-time   | `top`          |
| `htop`               | Colorized view of running processes      | `htop`         |
| `df -h`              | Show disk usage in human-readable format | `df -h`        |
| `du -sh [directory]` | Show size of a directory                 | `du -sh /home` |
| `free -h`            | Show memory usage                        | `free -h`      |
| `uname -a`           | Display system information               | `uname -a`     |
| `ps aux`             | Show all running processes               | `ps aux`       |

### 🌐 Network Essentials

| Command         | Description                          | Example                            |
| --------------- | ------------------------------------ | ---------------------------------- |
| `ifconfig`      | Show network interface configuration | `ifconfig`                         |
| `ip a`          | List IP addresses of interfaces      | `ip a`                             |
| `ping [host]`   | Check connectivity to a host         | `ping google.com`                  |
| `netstat -tuln` | List open ports                      | `netstat -tuln`                    |
| `curl [URL]`    | Fetch data from a URL                | `curl http://example.com`          |
| `wget [URL]`    | Download files from a URL            | `wget http://example.com/file.zip` |

### 💾 File Compression and Archiving

| Command                      | Description                          | Example                     |
| ---------------------------- | ------------------------------------ | --------------------------- |
| `tar -cvf archive.tar [dir]` | Create a .tar archive of a directory | `tar -cvf backup.tar /data` |
| `tar -xvf archive.tar`       | Extract contents of a .tar archive   | `tar -xvf backup.tar`       |
| `gzip [file]`                | Compress a file                      | `gzip file.txt`             |
| `gunzip [file.gz]`           | Decompress a .gz file                | `gunzip file.txt.gz`        |
| `zip [archive.zip] [file]`   | Compress files into a .zip archive   | `zip archive.zip file.txt`  |
| `unzip [archive.zip]`        | Extract contents of a .zip file      | `unzip archive.zip`         |

### 🔧 Process Management

| Command        | Description                              | Example         |
| -------------- | ---------------------------------------- | --------------- |
| `kill [PID]`   | Terminate a process by its ID            | `kill 1234`     |
| `pkill [name]` | Terminate a process by name              | `pkill firefox` |
| `bg`           | Move a job to the background             | `bg`            |
| `fg`           | Bring a background job to the foreground | `fg`            |
| `jobs`         | List background jobs                     | `jobs`          |

### ⏰ Scheduling with Cron

| Command      | Description                                          | Example                  |
| ------------ | ---------------------------------------------------- | ------------------------ |
| `crontab -e` | Edit the current user’s cron jobs                    | `crontab -e`             |
| Cron syntax  | `* * * * * command` (min, hour, day, month, weekday) | `*/5 * * * * /script.sh` |

### 🔑 SSH & Remote Access

| Command                         | Description                                 | Example                                |
| ------------------------------- | ------------------------------------------- | -------------------------------------- |
| `ssh user@host`                 | Connect to a remote system                  | `ssh user@192.168.1.10`                |
| `scp [source] user@host:[dest]` | Copy files to a remote system               | `scp file.txt user@192.168.1.10:/path` |
| `rsync -av [source] [dest]`     | Sync files between local and remote systems | `rsync -av /local user@host:/remote`   |


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