Add rsync page.

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+---
+sidebar_position: 3
+tags:
+    - linux
+    - unix
+    - utils
+    - rsync
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+# rsync
+
+[rsync](https://rsync.samba.org/) is an open source utility that provides fast
+incremental file transfer.
+
+## Installation
+
+<Tabs>
+  <TabItem value="arch" label="archlinux" default>
+        ```bash
+        $ sudo pacman -S rsync
+        ```
+  </TabItem>
+</Tabs>
+
+## Usage
+
+### As cp/mv alternative
+`rsync` can be used as an advanced alternative for the `cp` or `mv` command,
+especially for copying larger files:
+
+```bash
+$ rsync -P source destination
+```
+
+the `-P` option is the same as `--partial` `--progress`, which keeps partially 
+transferred files and shows a progress bar. You may want to use the
+`-r`/`--recursive` option to recurse into directories. 
+
+### Copy between remote hosts
+
+```bash title="Copy from local to remote host"
+$ rsync source host:destination
+```
+
+```bash title="Copy from remote host to local"
+$ rsync host:source destination
+```
+
+Network file transfers use the [SSH](https://wiki.archlinux.org/title/Secure_Shell)
+protocol by default and `host` can be a real hostname hostname or a predefined
+profile/alias from `.ssh/config`.
+
+### Examples
+
+```bash
+$ rsync -uvrP --delete-after ~/website/ root@remote-host:/var/www/website/
+```
+
+`-u`/`--update` - skip files that are newer on the receiver  
+`-v`/`--verbose` - increase verbosity  
+`-r`/`--recursive` - recurse into directories  
+`-P`/`--partial -- progress`- keeps partially transferred files and shows a progress bar  
+`--delete-after` - receiver deletes after transfer, not during
+