Added in the new files and swapped the theme to my modified version of bootstrap386
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# Basics of the linux shell
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# Basics
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Basics of the Linus Shell
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## Streams
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The linux shell (this will usually be [`bash`](bash.md)) works using different streams
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The linux shell (this will usually be [`bash`](/Linux/bash.md)) works using different streams
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The main three streams that are used on the command line are STDIN (Standard input), STDOUT (Standard output), STDERR (Standard Error)
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|ID|STREAM|USE|
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|---|:----|:---|
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|STREAM ID \| | STREAM NAME \| | STREAM USE|
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|------------|------|-----|
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| 0 | STDIN | Used to send input to the program |
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| 1 | STDOUT | Used to receive output from the program |
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| 2 | STDERR | Used to receive errors from the program |
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### Standard Input
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Standard input is how we send input to an application it is also how we interact with the command line shell (Usually [`bash`](/bash.md))
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Standard input is how we send input to an application it is also how we interact with the command line shell (Usually [`bash`](/Linux/bash.md))
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Whenever a linux program asks for input this is sent to the program using the STDIN stream
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#Connections to servers
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# Connections to servers
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Usually connections to servers are a sign that all is working, occasionally though some nefarious parties decide that they really like the server and want to hog all the connections to themselves.
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@ -18,6 +18,6 @@ In these situations we will usually see a high connection count for certain serv
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Finding IP addresses connecting to HTTP is quite easy, all you should need to do is tail access logs to find the IP addresses
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You can use a command like `tail -f /home/*/access-logs/* | awk '{print $1}'` to get a live update on connections via HTTP/HTTPS on the server. [For more information on the commands used click here](commands.md) *__Note: This will only check sites in /home__*
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You can use a command like `tail -f /home/*/access-logs/* | awk '{print $1}'` to get a live update on connections via HTTP/HTTPS on the server. [For more information on the commands used click here](/Commands/commands.md) *__Note: This will only check sites in /home__*
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##SMTP
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# Regex examples
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## Match an IP address
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`\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}`
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If we use this expression on the following using grep to search the file
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#Using `sed` to modify a DNS zone
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# Using `sed` to modify a DNS zone
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Take the following DNS zone as an example, say we needed to update the IP address from 110.232.142.185 to 45.65.88.152, you could modify the file using a text editor (see [editors](/commands#editors))
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Take the following DNS zone as an example, say we needed to update the IP address from 110.232.142.185 to 45.65.88.152, you could modify the file using a text editor (see [editors](/Commands/commands#editors))
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```bash
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$TTL 86400
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# Welcome to the necronomicon
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# Home
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## Welcome to the necronomicon
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[Klaatu barada nikto](https://www.imdb.com/title/tt0106308/)
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@ -8,5 +10,8 @@ This is a compendium of all the useless facts, tips, tricks and commands that I
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## Quick Links
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[Linux Shell Basics](/shellbasics)
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[Commands](/commands)
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\------------------------------------
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[Linux Shell Basics](/Linux/shellbasics)
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[Commands](/Commands/commands)
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10
mkdocs.yml
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mkdocs.yml
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site_name: Useful commands and tips
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nav:
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- Home: index.md
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- Commands: commands.md
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- Connections: connections.md
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- Regex: regex.md
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theme: readthedocs
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site_name: Useful tips
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theme: bootstrap386
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7
mkdocs.yml.old
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7
mkdocs.yml.old
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site_name: Useful commands and tips
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nav:
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- Home: index.md
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- Commands: commands.md
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- Connections: connections.md
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- Regex: regex.md
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theme: bootstrap386
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