Print System Variables

clear
echo $BASH
echo $BASH_VERSION
echo $COLUMNS
echo $HOME
echo $LINES
echo $LOGNAME
echo $OSTYPE
echo $PATH
echo $PS1
echo $PWD
echo $SHELL
echo $USERNAME

Basics

clear
echo "Hello $USER"
echo "Today is \c ";date
echo "Number of user login : \c" ; who | wc -l
echo "Calendar"
cal
exit 0