linux.md

Linux operating systems

Content

• Linux Kernel

Distributions

• Debian
  • Ubuntu
• Fedora
  • Red Hat Enterprise Linux (RHEL)
    • CentOS
    • Rocky
• SUSE
  • openSUSE
  • SUSE Linux Enterprise

Common utilities

• systemd

• journald

• firewalld

• ip

• uname

• df

• free

• less /proc/meminfo

• more /proc/cpuinfo

• cat /proc/version

Usual commands

# get information on the kernel
uname -or

# get server name
hostname
uname -n

# get information on a user
id
id otherusername

# update my password
passwd

# add a user (the user will be locked and we need to define its password with passwd)
useradd xxx

# extend admin permission for 5 minutes
sudo -v

# live monitoring of processes
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Common packages

Name	Details
wget	GNU Wget is a free software package for retrieving files using HTTP, HTTPS, FTP and FTPS the most widely-used Internet protocols

Shell shortcuts

Shortcut	Action
Ctrl + R	Search a command in the history