BASH scripting with conditional logic

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IF/THEN statements

#!/bin/bashecho "What would you like to see?Todays date (d)Currently logged in users (u)The contents of the / directory (r)Enter your choice(d/u/r)--> "read ANSWERif [ $ANSWER = "d" –o $ANSWER = "D" ]	then echo "Today’s date is: "	dateelif [ $ANSWER = "u" –o $ANSWER = "U" ]then	echo "The people logged into the system include:"	whoelif [ $ANSWER = "r" –o $ANSWER = "R" ]then	echo "The contents of the / directory are:"	ls /fi

CASE statements

#!/bin/bashecho "What would you like to see?Todays date (d)Currently logged in users (u)The contents of the / directory (r)Enter your choice(d/u/r)--> "read ANSWERcase $ANSWER in	d | D ) 		echo "Today’s date is: "		date		;;	u | U ) 		echo "The people logged into the system include:"		who		;;	r | R ) 		echo "The contents of the / directory are:"		ls /		;;	*) echo –e "Invalid choice! \a"		;;esac

WHILE statements

#!/bin/bashCOUNTER=0while [ $COUNTER –lt 7 ]do	echo "All work and no play makes Jack a dull boy" 	COUNTER=`expr $COUNTER + 1`done

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