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Shell Redirection: >, >>, <, |, 2> and tee Explained
Methods for redirecting data through the shell, either from/to files or commands. Standard Input...
Hard & Symbolic Links
The ln command is used to create links between files. There are two types of links: HardLinks & S...
GREP
GREP Grep is used to search file contents for a particular string or pattern. grep [option] {se...
Data Manipulation: echo, printf, tr, wc, sort, cut, paste, diff, awk, sed
echo Built-in Linux feature to print out arguments as standard output. echo {string} print...
Find & Locate
FIND Find is a linux search tool that can be used to find a variety of files based on the give...
VI/VIM
VIM is the best Linux text editor. i insert. A insert at the end of the current l...
LogRotate
LogRotate Configuration. https://www.redhat.com/sysadmin/setting-logrotate If not installed alr...
initrd (initialisation RAM disk)
What are initramfs and initrd? initrd and initramfs are temporary root filesystems loaded into...
Kernel Tuneable's
Kernel Tunables In Linux, a tunable refers to a specific type of configuration setting within th...
Kernel Modules
What is a kernel module? A kernel module is essentially a piece of code that can be loaded int...
Single User Mode
Boot the server into 'single user mode' B. Once in single user mode, we can look to initiate t...
LDAP (Lightweight Directory Access Protocol)
LDAP (Lightweight Directory Access Protocol) is a protocol used to access and manage directory se...
Troubleshooting Boot Issues & System Recovery
System boot logs The below log files are most relevant to viewing boot logs and errors dmesg ...
Linux Boot Process
The below image outlines the typical flow of a Linux system boot. 1. BIOS (Basic Input/Outpu...
LBv2 Overview
ANS Portal > Servers > Load Balancers Services: haproxy Warden /var/log/warden/warden.log ...
File Permissions & Ownership
Linux File Ownership Files and directories in Linux are owned by a user and a group. chown The...
Sandboxing & CHROOT
==================================================================================== CHROOT (Cha...
ARP
show arp cache arp -a
Auto Restart Services
https://www.redhat.com/sysadmin/systemd-automate-recovery 1) Edit elasticsearch service unit ...
Single User Mode
==================================================================================== You might n...