move cronjob and linux basics

guides/linux/home.md

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+---
+title: Linux Home
+description: Linux guides
+published: true
+date: 2023-06-27T11:15:30.081Z
+tags: linux
+editor: markdown
+dateCreated: 2023-06-27T11:15:59.640Z
+---
+
+# Pages
+
+- [How to use Cronjobs](/guides/linux/pages/cronjob)

guides/linux/pages/basics.md

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+---
+title: The basics of Linux
+description: Simple examples showing you around Linux
+published: true
+date: 2023-06-27T07:54:18.672Z
+tags: linux, server
+editor: markdown
+dateCreated: 2023-06-27T07:54:18.672Z
+---
+
+# Linux Basics
+
+This guide provides a brief introduction to Linux, including basic commands and concepts.
+
+## Navigating the filesystem
+
+- Change a directory: `cd <directory>`
+- List files in a directory: `ls`
+- List files in a directory (including hidden files): `ls -a`
+- Getting the current directory: `pwd`
+- Going back a directory: `cd ..`
+
+## Managing Files and Directories
+
+- Create a new directory: `mkdir <directory>`
+- Create a new file: `touch <file>`
+- Copy a file: `cp <file> <new-file>`
+- Remove a file: `rm <file>`
+- Remove a directory: `rm -r <directory>`
+
+## File Permissions
+
+- Change file permissions: `chmod <permissions> <file>`
+- Change file ownership: `chown <user> <file>`
+- Change file ownership (recursively): `chown -R <user> <directory>`
+- View file permissions: `ls -l <file>`
+
+## Text Processing
+
+There are alternatives to nano, but it is the easiest to use.
+
+- Edit a file: `nano <file>`
+- View a file: `cat <file>`
+- View a file (with line numbers): `cat -n <file>`
+- Get the beginning of a file: `head <file>`
+- Get the end of a file: `tail <file>`
+
+## File Compression and Archiving
+
+- Create a tar archive: `tar -cvf <archive.tar> <file>`
+- Extract a tar archive: `tar -xvf <archive.tar>`
+- Create a zip archive: `zip <archive.zip> <file>`
+- Extract a zip archive: `unzip <archive.zip>`
+
+## Package Management (Ubuntu)
+
+- Update package lists: `sudo apt update`
+- Install a package: `sudo apt install <package>`
+- Purge a package: `sudo apt purge <package>`
+- Remove a package: `sudo apt remove <package>`
+- Search for a package: `apt search <package>`
+- Upgrade packages: `sudo apt upgrade`
+
+## Networking
+
+- Get all interface ips: `ip a`
+- Ping a host: `ping <host>`
+- Get the public IP: `curl ifconfig.me`
+- Get the public IP (alternative): `curl ipinfo.io/ip`
+
+## Firewall (UFW)
+
+Make sure to allow SSH before enabling the firewall, otherwise you will be locked out of your server. `sudo ufw allow ssh`
+
+- Enable the firewall: `sudo ufw enable`
+- Disable the firewall: `sudo ufw disable`
+- List all rules: `sudo ufw status`
+- List all rules (showing numbers): `sudo ufw status numbered`
+- Delete a rule: `sudo ufw delete <rule>`
+- Allow a port: `sudo ufw allow <port>`
+- Deny a port: `sudo ufw deny <port>`
+- Allow a service: `sudo ufw allow <service>`
+- Deny a service: `sudo ufw deny <service>`
+
+## Service Management (Systemd)
+
+- Start a service: `sudo systemctl start <service>`
+- Stop a service: `sudo systemctl stop <service>`
+- Check the status of a service: `sudo systemctl status <service>`
+- Restart a service: `sudo systemctl restart <service>`
+- Enable a service (start on boot): `sudo systemctl enable <service>`
+- Disable a service (stop on boot): `sudo systemctl disable <service>`
+- Reload a service: `sudo systemctl reload <service>`

guides/linux/pages/cronjob.md

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+---
+title: How to use cronjobs
+description: Examples on how to use cronjob to automate tasks
+published: true
+date: 2023-06-27T08:28:13.676Z
+tags:
+editor: markdown
+dateCreated: 2023-06-27T08:28:13.676Z
+---
+
+# How to use cronjobs
+
+This guide provides examples on how to use cronjob to automate tasks. _This was tested on Ubuntu 22.04._
+
+## Get Started
+
+- Begin by opening a terminal and running the following command:
+
+```bash
+crontab -e
+```
+
+This command will open the crontab file in the nano text editor.
+
+- Next, you need to define the cronjob. Add the following lines to the file:
+
+```bash
+* * * * * <command>
+```
+
+- Finally, you can save the file by pressing `Ctrl + X` and then `Y`.
+
+## Syntax
+
+```bash
+* <- minute (0-59)
+  * <- hour (0-23)
+    * <- day of month (1-31)
+      * <- month (1-12)
+        * <- day of week (0-6) (Sunday=0)
+          <command> <- the command to execute
+```
+
+## Examples
+
+### Run a command every minute
+
+```bash
+* * * * * <command>
+```
+
+### Run a command every 5 minutes
+
+```bash
+*/5 * * * * <command>
+```
+
+### Run a command every hour
+
+```bash
+0 * * * * <command>
+```
+
+### Run a command every day at midnight
+
+```bash
+0 0 * * * <command>
+```