Linux commands

gistfile1.txt

Linux Guide

https://github.com/livialima/linuxupskillchallenge


# Basic Commands
   ◦ ps
   ◦ df
   ◦ du
   ◦ vim
   ◦ top
   ◦ less
   ◦ more
   ◦ zless
   ◦ grep

# Check if SSH is enabled
systemctl status sshd

# Check for a Port that is listening on the server
ss -patun | grep 2222

## Firewall management
### Install a package
yum install -y firewalld

### List Firewall ports
firewall-cmd  --list-all

### Add predefined services
firewall-cmd --permanent --add-service=httpd

### List predefined services
firewall-cmd --get-services




# Selinux (Advanced) Turn it off for now
setenforce 0

## Package Management
### Install a package or multiple
yum install -y vim tmux

### To view files owned by package
repoquery -l httpd

### Get installed packages
yum list installed | grep httpd

## Process Management
### Grep Httpd pid
pgrep httpd

### Grep process list
ps aux | grep httpd

### Filter per process
ps -ylC httpd

## File Processing
• vim → press i to go to insert mode, vimtutor will help you learn basic vim
• wc → Word Count for lines → wc -l
• shell redirection, >, >>, 2>1,
• less => View files in a pager mode -> Ability to view and search text
• cat → Spit all the lines to the terminal
• zless → compressed files
• zgrep → grep through compressed files