Shell Script : command not found error - 


#!/bin/bash  calc() {         n1=$1         op=$2         n2=$3         ans=0          if [ $# -eq 3 ]                                 $ans=$(expr $n1 $op $n2);                 echo "$n1 $op $n2 = $ans"                 return $ans         else                 echo "needs 3 parameters!"         fi          return;  }

i googled alot still can not find error in code, know simple code please me i'm totally new , trying self study.

the error 

line 12: 0=11: command not found

thank in advance

the error coming '$ans' on line

 $ans=$(expr $n1 $op $n2);

should 

ans=$(expr $n1 $op $n2);

the '$' evaluating variable 'ans', result instead of assigning result variable 'ans', trying assign result '0'.


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