exa a modern replacement for ls command in rust for Linux/Unix
🐧 nixCraft → Open Source → Command Line Hacks → exa a modern replacement for ls command in rust for Linux/Unix ls is a command to show files in Linux and Unix-like operating systems. A ls command first appeared in a version of AT&T UNIX as well as in Multics. BSD and GNU Coreutils package provides the ls command with minor syntax changes. There is now third alternative named exa. It is a modern r
Linux Find Number of CPU Cores Command
nixCraft is a one-person operation. I create all the content myself, with no help from AI or ML. I keep the content accurate and up-to-date. Your privacy is my top priority. I don’t track you, show you ads, or spam you with emails. Just pure content in the true spirit of Linux and FLOSS. Fast and clean browsing experience. nixCraft is designed to be fast and easy to use. You won’t have to deal wit
How Do I Find Out Linux CPU Utilization and Usage?
Whenever a Linux system CPU is occupied by a process, it is unavailable for processing other requests. Rest of pending requests must wait until the CPU is free. This becomes a bottleneck in the system. Following command will help you to identify CPU utilization, so that you can troubleshoot CPU-related performance problems on a Linux-based system. This page explains how to check Linux CPU utilizat
CentOS / Redhat Iptables Firewall Configuration Tutorial - nixCraft
Iptables Config File The default config files for RHEL / CentOS / Fedora Linux are: /etc/sysconfig/iptables – The system scripts that activate the firewall by reading this file. Task: Display Default Rules Type the following command: iptables --line-numbers -n -L Sample outputs: Chain INPUT (policy ACCEPT) num target prot opt source destination 1 RH-Firewall-1-INPUT all -- 0.0.0.0/0 0.0.0.0/0 Chai
Linux Kernel /etc/sysctl.conf Security Hardening
How do I set advanced security options of the TCP/IP stack and virtual memory to improve the security and performance of my Linux based system? How do I configure Linux kernel to prevent certain kinds of attacks using /etc/sysctl.conf? How do I set Linux kernel parameters? sysctl is an interface that allows you to make changes to a running Linux kernel. With /etc/sysctl.conf you can configure vari
30 Cool Open Source Software I Discovered in 2013
These are full-featured open source software products, free as in beer and speech that I started to use recently. Vivek Gite picks his best open source software of 2013. nixCraft is a one-person operation. I create all the content myself, with no help from AI or ML. I keep the content accurate and up-to-date. Your privacy is my top priority. I don’t track you, show you ads, or spam you with emails
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This quick tutorial explains How to check the SHA1 hash of a file on Linux, FreeBSD, and Unix-like systems using the sha1sum or sha1 command. [continue reading…] This quick tutorial explains how to install and set up OpenSSH (SSHD) server and client on the Alpine Linux system. Further, you will learn how to build a Docker Linux container running sshd server based upon Alpine Linux image too. [cont
Regular expressions in grep ( regex ) with examples - nixCraft
How do I use the grep command with regular expressions on a Linux and Unix-like operating systems? How do I use grep and regular expressions (regex)to search for text/ words in Linux? Linux comes with GNU grep, which supports extended regular expressions. GNU grep is the default on all Linux systems. The grep command is used to locate information stored anywhere on your server or workstation. Let
Top 25 Nginx Web Server Best Security Practices
Nginx is a lightweight, high-performance web server/reverse proxy and e-mail (IMAP/POP3) proxy. It runs on UNIX, GNU/Linux, BSD variants, Mac OS X, Solaris, and Microsoft Windows. According to Netcraft, 13.50% of all domains on the Internet use nginx web server. Nginx is one of a handful of servers written to address the C10K problem. Unlike traditional servers, Nginx doesn’t rely on threads to ha
Nginx Block And Deny IP Address OR Network Subnets
How do I block or deny access based on the host name or IP address of the client visiting website under nginx web server? Nginx comes with a simple module called ngx_http_access_module to allow or deny access to IP address. The syntax is as follows: nixCraft is a one-person operation. I create all the content myself, with no help from AI or ML. I keep the content accurate and up-to-date. Your priv
PostgreSQL add or create a user account and grant permission for database
How do I create a user account called tom and grant permission for database called jerry when using PostgreSQL database? You need to use the following commands to add or create a user account and grant permission for database: nixCraft is a one-person operation. I create all the content myself, with no help from AI or ML. I keep the content accurate and up-to-date. Your privacy is my top priority.
9 Tips to diagnose remote GNU/Linux server network connectivity issues
Many new admin or Linux users get frustrated when their remote Linux box is not accessible dues to network connectivity. In this article I will try to provide tools and information about how to diagnose network configurations. You can try these tips/tools to diagnose an issue of Linux network connectivity to remote or local servers. Steps to diagnose the problem: #1: Use ping command Always ping t
Linux Increasing The Transmit Queue Length (txqueuelen)
nixCraft → Howto → BASH Shell → Linux Increasing The Transmit Queue Length (txqueuelen) How do I set txqueuelen (the length of the transmit queue) length of the network card device under Linux? How do I set it for a high latency and/or a high speed network for bulk transfer from disturbing interactive traffic like ssh too much? You can set the length of the transmit queue of the device using /sbin
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Software Vs Hardware RAID - nixCraft
Linux iptables Port Redirection Example
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Linux Static IP Address Configuration