Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. When it finds a match, it prints the line with the result. The grep command is handy when searching through large log files. Grep lets us enter a pattern of text and then it searches …
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ICMP type is the first 8 bits in the ICMP message header. It provides a brief explanation of what the message is for so the receiving network device knows why it is getting the message and how to treat it. For example, a Type 8 Echo is a query a host sends to see if …
Internet Control Message Protocol (ICMP) is a network layer protocol that serves the purpose of error reporting and network path diagnostic functions. ICMP messages are sent using a basic IP header. The protocol field in IP header will be set to ICMP followed by the ICMP payload. How does ICMP work? ICMP Packet Structure ICMP …
If you’re a gamer, then you know that a fast and reliable DNS server is essential for an optimal gaming experience. In this blog post, we will discuss the best DNS servers for PS4 PS5 and how to optimize your gaming experience. We will also provide instructions on how to change your DNS server settings …
The traceroute command is used to trace the exact routing hops and the path that the packets take to the remote destination. This command’s purpose is to test and display the communication link between a source host and a destination host or network. We will dive into traceroute command today to see how it works. …
Dig is a very powerful Linux command to query DNS in Linux. We will dive into the dig command output today. The dig command is a DNS lookup utility that can be used to troubleshoot DNS issues in Linux. It can also be used to query DNS records. The dig command can be used to …
CPU usage is an important metric for CPU performance in Linux. Today we will learn how to use top and sar command to check cpu usage and what us sy ni wa hi st means. Understanding CPU usage in Linux CPU usage is a statistic of CPU usage per unit time, displayed as a percentage. …
When I first began managing Linux servers, one of the most perplexing metrics I encountered was the load average. At first glance, the numbers seemed abstract and elusive—what did a load average of 2.5 or 5.0 actually mean for system performance? I vividly remember the first time I was faced with a server running unusually …
On Linux a login shell is a shell given to a user upon login into their user account. Today we will look at how to change the default login shell safely for one specific user. Understanding user shell in Linux A user’s shell is the program that runs when they login to a Linux system. …
How to check disk space is a commonly asked question during a Linux job interview. Disk space usage and disk utilization are different in Linux. Disk space usage means how much percent of space we use on the disk. Disk utilization means how busy the disk is when there is some workload on it. Today …