Linux Command Cheat Sheet

Linux Command Cheat Sheet

Basic Linux commands

lsLists all files and directories in the present working directory
ls -RLists files in sub-directories as well
ls -aLists hidden files as well
ls -alLists files and directories with detailed information like permissions,size, owner, etc.
cd or cd ~Navigate to HOME directory
cd ..Move one level up
cdTo change to a particular directory
cd /Move to the root directory
cat > filenameCreates a new file
cat filenameDisplays the file content
cat file1 file2 > file3Joins two files (file1, file2) and stores the output in a new file (file3)
mv file "new file path"Moves the files to the new location
mv filename new_file_nameRenames the file to a new filename
sudoAllows regular users to run programs with the security privileges of the superuser or root
rm filenameDeletes a file
manGives help information on a command
historyGives a list of all past commands typed in the current terminal session
clearClears the terminal
mkdir directorynameCreates a new directory in the present working directory or a at the specified path
rmdirDeletes a directory
mvRenames a directory
apt-getCommand used to install and update packages

File Permission commands

ls -lto show file type and access permission
rread permission
wwrite permission
xexecute permission
-=no permission
Chown userFor changing the ownership of a file/directory
Chown user:group filenamechange the user as well as group for a file or directory

User management commands of linux

sudo adduser usernameTo add a new user
sudo passwd -l 'username'To change the password of a user
sudo userdel -r 'username'To remove a newly created user
sudo usermod -a -G GROUPNAME USERNAMETo add a user to a group

Networking command

SSH username@ip-address or hostnamelogin into a remote Linux machine using SSH
Ping hostname="" or =""To ping and Analyzing network and host connections

Process command

topDetails on all Active Processes
psGive the status of processes running for a user
ps PIDGives the status of a particular process
pidofGives the Process ID (PID) of a process
kill PIDKills a process
niceStarts a process with a given priority
dfGives free hard disk space on your system
freeGives free RAM on your system