제 스크립트 오류가 어디서 나는지 궁금해서 질문해봅니다!

==========================실행시 에러 로그=================================

[root@c function]# ./use_cal.sh

/s/lang/function/cal: line 3: syntax error near unexpected token `echo'

/s/lang/function/cal: line 3: ` echo " $1 + $2 = " '

./use_cal.sh: line 5: plus: command not found

./use_cal.sh: line 6: minus: command not found

./use_cal.sh: line 7: multi: command not found

./use_cal.sh: line 8: div: command not found

./use_cal.sh: line 9: div: command not found

=================================================================

vi cal

function plus{

        echo " $1 + $2 = "

        echo $[ $1 + $2 ]

        echo

}

function minus{

        echo " $1 - $2 = "

        echo $[ $1 - $2 ]

        echo

}

function multi{

        echo " $1 * $2 = "

        echo $[ $1 * $2 ]

        echo

}

function div{

        echo " $1 / $2 = "

        if [ $2 -eq 0]

        then

                echo " 0 으로 나눌수 없음"

        else

                echo $[ $1 / $2 ]

        fi

        echo

}

====================================================

vi use_cal.sh      ---> chmod 700 

#!/bin/bash

source ./cal

plus 30 40

minus 10 3

multi 11 7

div 2 0

div 14 2

============================================================