shell script program to greet based on system time in linux

Shell program to greet user based on system time in the operating system suppose time in operating system is 8:00 am then it will display “good morning”. if it is noon then it wi display the “Good afternoon “

To do this date command is used to display the time and check the current time in operating system and check the condition based of time to decide the result.

t=””

ct=`echo $(date +”%H:%M:%S”)`

t=`echo $(date +”%H”)`

echo $ct

if [ $t -le 10 -a $t -ge  6 ]

then

echo ” Good morning “

elif [ $t -gt 10 -a $t -le 16 ]

then

echo ” good after noon”

elif [ $t -gt 16 -a $t -le 20 ]

then

echo “good evening “

elif [ $t -gt 20 -a $t -le 5 ]

then

echo ” good night “

fi

Output: