Add Gemstones page for nload

docs/gemstones/nload.md

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+---
+title : nload - Bandwidth Statistics
+author : Neel Chauhan
+contributors: 
+date : 2024-01-16
+---
+
+# `nload` Introduction
+
+`nload` is a text console-based network traffic monitor. It shows your server's traffic and bandwidth statistics.
+
+## Using `nload`
+
+```bash
+dnf -y install epel-release
+dnf -y install nload
+```
+
+The common options of the `nload` command are as follows. Under normal circumstances, no additional options are required, followed by the interface to monitor:
+
+|Options|Description|
+|---|---|
+|-a PERIOD |Length for time window of calculation in seconds (default: 300)|
+|-m |Show multiple devices and don't show traffic graph|
+|-t INTERVAL |Refresh interval in milliseconds (default: 500)|
+|-u UNIT |One-letter unit for bandwidth display (default: k)|
+|-U UNIT |One-Letter unit for data transfer display (default: M)|
+
+The units for the latter two options are as follows:
+
+|Unit|Meaning|
+|---|---|
+|b |bit|
+|B |byte|
+|k |kilobit|
+|K |kilobyte|
+|m |megabit|
+|M |megabyte|
+|g |gigabit|
+|G |gigabyte|
+
+A sample output from the author's home server running a [Tor](https://www.torproject.org/) [relay](https://community.torproject.org/relay/types-of-relays/):
+
+```bash
+Device bridge0 [172.20.0.3] (1/8):
+================================================================================
+Incoming:
+                                             ########
+                                             ########
+                                             ########
+                                             ########
+                                             ########
+                                             ########  Curr: 79.13 MBit/s
+                                             ########  Avg: 84.99 MBit/s
+                                             ########  Min: 79.13 MBit/s
+                                             ########  Max: 87.81 MBit/s
+                                             ########  Ttl: 1732.95 GByte
+Outgoing:
+                                             ########
+                                             ########
+                                             ########
+                                             ########
+                                             ########
+                                             ########  Curr: 81.30 MBit/s
+                                             ########  Avg: 88.05 MBit/s
+                                             ########  Min: 81.30 MBit/s
+                                             ########  Max: 91.36 MBit/s
+                                             ########  Ttl: 1790.74 GByte
+```
+
+The above lines mean the following:
+
+* Curr - current measured bandwidth use
+* Avg - average bandwidth use in period
+* Min - minimum measured bandwidth use
+* Max - maximum measured bandwidth use
+* Ttl - data transferred in `nload` session
+
+##  Shortcut keys for interaction
+* <kbd>PgDn</kbd>, <kbd>Down</kbd> - Go down one interface
+* <kbd>PgUp</kbd>, <kbd>Up</kbd> - Go up one interface
+* <kbd>F2</kbd> - Show the option window
+* <kbd>F5</kbd> - Save the options
+* <kbd>F6</kbd> - Reload the settings from the config file
+* <kbd>q</kbd>, <kbd>Ctrl</kbd>+<kbd>C</kbd> - Quit `nload`