Basic to advanced Complete Red Hat Linux commands
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Basic to Advanced Red HAT Linux Commands
Basic Linux Commands
hostnamectl Get system information including, operating system, kernel, and release version
date Display the current system date and time
hostname Display the hostname of the system
ifconfig Display the IP and Mac Address of the system
w Display currently logged in users in the system
free -m Display free and used memory in the system
top Display all running processes
ls List all files and directories in the current working directory
ls -al List all files and directories including, hidden files and other information like permissions, size, and owner
cd Change the directory to the home directory
cd .. Change the directory to one level up
cat filename Display the content of the file
tail filename Display the last 10 lines of a file
head filename Display the first 10 lines of a file
mv oldfile newfile Rename a file
rm filename Delete a file
mkdir dirname Create a directory
rm -rf dirname Remove a directory
history Print a history list of all commands
Networking Commands
ip addr show Or ifconfig List all IP addresses and network interfaces
ip addr add IP-Address dev eth1 Add a temporary IP address to interface eth1
netstat -pnltu Display all listening port
whois domainname Display more information about any domain
dig domainname Display DNS information of any domain
host domainname Perform an IP lookup for a domain
dig -x IP-Address Perform a reverse lookup of an IP address
dig -x domainame Perform a reverse lookup on domain
ping host-ip Check connectivity between two hosts
clear Clear the terminal
shutdown -h now Shut down the system
reboot Restart the system
File Permission Commands
ls -l filename Check the current permission of any file
chmod 777 filename Assign full(read, write, and execute) permission to everyone
chmod -R 777 dirname Assign full permission to the directory and all sub-directories
chmod 766 filename Assign full permission to the owner, and read and write permission to group and others
chmod -x filename Remove the execution permission of any file
chown username filename Change the ownership of a file
chown user:group filename Change the owner and group ownership of a file
chown -R user:group dirname Change the owner and group ownership of the directory and all sub-directories
User and Group Management Commands
w Display all login users
useradd username Add a new user account
userdel -r username Delete a user account
usermod [option] username Change the user account information including, group, home directory, shell, expiration date
usermod -aG groupname username Add a user to a specific group
groupadd groupname Create a new group
groupdel groupname Remove a group
last Display information of the last login user
id Display UID and GID of the current user
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