Linux basic commands

ls -la - list files and directories
pwd - print working directory
cd - change directory
mkdir - make directory
touch - create a file
rm - remove file
cp - copy file
mv - move file
cat - concatenate files and print on the standard output
scp - secure copy
ssh - secure shell
chmod - change file mode bit`
whoami - print effective userid
id - print real and effective user and group IDs
sudo - execute a command as another user
su - substitute user identity
nano - text editor
man command - show manual for command
clear - clear terminal
echo - display line of text/string that are passed as an argument
grep - search text. Example: grep -r "text" folder
find - search files in a directory hierarchy
apt-get - package manager for Debian based systems