simple_database/simple_db at master · Ariel-Yeung/simple_database · GitHub

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#!/bin/bash
# CS 265 Assignment 2
# Man Yi (Ariel) Yeung


while true
do
	echo -n "% "
	read "input1"


	case "$input1" in
   	quit)												#quit command
      		exit
      		;;

   	setdb*)												#setdb command
		db="${input1:6}"

      		multfile=0
      		if [[ ! -z $(echo "$db" | grep " ") ]]       						#multiple filenames provided
      		then
         		db="${db% *}"
         		multfile=1
      		fi

		if [[ -f "$db" ]]
		then
	         	if [[ -r "$db" ]]
            		then
               			echo "Database set to ${db}."     					#db exists and readable
				database=$db
			else
               			echo "File ${db} is not readable."     					#db exists but not readable
			fi
      		else
         		touch "$db"
         		echo "File ${db} created. Database set to ${db}."   			  	#db not exist
      			database=$db
		fi

      		if [[ $multfile == 1 ]]
      		then
         		echo "Extra arguments ignored."   					        #print statement for multiple filename
      		fi
      		;;

	add*)												#add command
		if [[ $(echo "$input1" | awk '{ print NF }') == 3 ]]
		then
			if [[ ! -z $database ]]								#if database has been set
			then
				product=$(echo "$input1" | awk '{ print $2 }')
				price=$(echo "$input1" | awk '{ print $3 }')

				if [[ -z $(cat $database | grep $product) ]]
				then
					echo "$product:$price" >> $database				#if product not present
					echo "$product:$price has been added to the database."

				else									#if product present
					cat $database | awk -F":" -v var1="$product" -v var2="$price" '$1~var1{gsub($2,var2)}1' > temp.txt && mv -f temp.txt $database
					rm -f temp.txt
					echo "$product has been updated to $price."
				fi

			else
				echo "Database has not been set."
			fi
		else
			echo "Incorrect syntax."
		fi
		;;

	delete*)											#delete command
		if [[ $(echo "$input1" | awk '{ print NF }') == 2 ]]
		then
			delprod=$(echo "$input1" | awk '{ print $2 }')
			if [[ ! -z $database ]]
			then
				if [[ ! -z $(cat $database | grep $delprod) ]]
				then
					sed -i "/$delprod/d" $database					#database set and product found
					echo "$delprod has been deleted from $database"
				else
					echo "$delprod does not exist in $database"			#database set and product not found
				fi
			else
				echo "Database has not been set."					#database not set
			fi
		else
			echo "Incorrect syntax."
		fi
		;;

	printdb)
		if [[ ! -z $database ]]
		then
			cat $database
		else
			echo "Database has not been set."
		fi
		;;

   	*)												#Other commands
      	echo "Unrecognized command."
      	;;
	esac
done