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Category: Linux

Linux Shell Scripts for System Administrators

1. File Backup Script: 2. System Monitoring Script: 3. Log Analyzer Script: 4. File Encryption/Decryption Script: 5. Automated Software Installation Script: 6. Network Connectivity Checker Script: 7. Website Uptime Checker Script: 8. Data Cleanup Script: 9. CPU Usage Tracker Script: 10. System Information Script: 11. Disk Space Monitoring Script: 12. Remote Server Backup Script:...
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SOCKS PROXY

A SOCKS proxy allows you to route HTTP traffic through a remote server, VPS, router, etc., and access it locally via a browser. This is particularly useful for remotely administering firewalls or routing appliances via their private IP addresses, enabling you to avoid port forwarding and its associated security risks. This setup works through...
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How to grep IP addresses from log files in Linux

The system level log files usually keeps a lot of data about various applications and services . So at some times , we might need to grep only the IP communications from a large log file like ‘/var/log/messages’ or from syslog. The below command will grep only the data with IP addresses . The...
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How to empty or delete a large file in Linux

When dealing with files in Linux , sometimes you need to empty it without opening the actual file . Also , this is very useful is safely emptying a dynamically writing file, especially some of the log files . So we are looking on some of the commands to do this . Empty using...
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How to list and delete an IPtables rule in Linux

We will first check some of the general Iptables commands . The below command will dispaly all the available chains ( TCP, INPUT, OUTPUT, etc.) configured. You can then filter this more with specific chains , the below command will display all the INPUT rules To display all the active rules , you can do...
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Nagios showing different outputs while running plugins locally and from remote server

So when you have a custom plugin and you run it locally you will get the correct output but when you call the same plugin from the remote server (nagiosadmin) the output will be wrong . This is a user permission issue on some files you specified in the plugin script .For eg :...
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How to avoid whitespaces on a variable output in shell

When you are scripting in shell , you might need the output of a shell command assigned to a variable and then you use that variable somewhere else in the script . So in this case there are chances that the whitespace occurs in the command output and when you use it somewhere else...
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How to find large size files in Linux

If you want to display the largest files from the current directory To display output from a specific directory , here I m looking for the files from /var directory To see the same output in more readable format like in GB from the current directory some of the options thats using with the...
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How to use nohup to run a command in the background

nohup stands for no hangup is a commandline utility that ignores the HUP signals coming to the commands running on a shell. So when a shell is terminated , the processes associated with that shell recieves a hup signal . So that those processes gets stopped or hangup . So the nohup helps us...
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How to Live stream a camera to Youtube using FFMPEG in Raspberry pi 4

Live streaming camera footage, such as watching pets or observing a bird’s nest, has become a popular hobby. Platforms like YouTube and Facebook allow anyone to view these streams from anywhere in the world, often driving significant traffic to your channel. In this guide, we’ll explore how to set up a live stream using...
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  • Linux Shell Scripts for System Administrators
  • SOCKS PROXY
  • How to grep IP addresses from log files in Linux
  • How to empty or delete a large file in Linux

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