8. Shell Script - 조건문, 반복문

** 참고

   and : 곱하기 / -a : 그리고

   or : 더하기 / -o : 또는

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1. 조건문

if : 조건이 참, 거짓일때	case : 조건이 여러 가지 일때
#!/bin/bash echo -n "Enter Fruits" read fname if [ $fname = "apple" ] ; then    echo "I like apple!" elif [ $fname = "orange" ] ; then    echo "I like orange!" else    if [ $fname = "onion" ] ; then       echo "This is not Fruits!"    fi fi	#!/bin/bash echo -n "[one]Web [two]Was [three]DB" echo -n "Enter your choice : " read choice case $choice in      one)        sh /shell/web_backup.sh ;;      two)        sh /shell/was_backup.sh ;;      three)        sh /shell/db_backup.sh ;;      *)        echo "Enter [ one, two, three ] " esac

 

2. 반복문

for : 반복횟수를 알고있을 때	while : 반복횟수를 알수 없을때	until : 조건이 참일때까지 반복
#!/bin/bash echo " " for i in 2 3 4 5 6 7 8 9 do     for j in 1 2 3 4 5 6 7 8 9       do         gop=`expr $i  $j`         echo "$i X $j = $gop"       done echo " " done	#!/bin/bash echo " " dan=2 num=1 while [ $dan -le 9 ] do num=1    while [ $num -le 9 ]     do       gop=`expr $dan  $num`       echo " $dan X $num = $gop"       num=`expr $num + 1`     done    dan=`expr $dan + 1`    echo " " done	#!/bin/bash echo " "  echo -n "Enter Number : "  read dan echo " " num=1 until [ $num -eq 10 ] do   gop=`expr $dan  $num`   echo " $dan X $num = $gop"   num=`expr $num + 1` done