Bash函数参数

Question

My problem is that prepinace_grepu , which is $3 inside of function, evaluates to -i instead of -i -n as I expected it to be .
How can I change it to work? And I cant put it in two variables, because I want it to be flexible and just take it as a string , so it will work even if prepinace_grepu="-c -v -i -f" etc...

compare()
{
semka $2 $1 /etc/passwd /etc/shadow | sort > result1.txt
grep $3 $1 /etc/passwd /etc/shadow | sort > result2.txt
diff result2.txt result1.txt > diff.txt

if [[ -s diff.txt ]] ; 
    then echo "FAIL"
else echo "OK"
fi ;
 }

pattern=Hojny 
prepinace_moje="-vi"
prepinace_grepu="-i -n" 
compare $pattern $prepinace_moje $prepinace_grepu

Answer 1

Quote the variables in shell as much as you can:

pattern="Hojny"
prepinace_moje="-vi"
prepinace_grepu="-i -n" 
compare "$pattern" "$prepinace_moje" "$prepinace_grepu"

Since prepinace_grepu contains space you must send it in quotes otherwise called function will only get -i and $3 and -n as $4 .