SO - Bash Script Test #2

#! /bin/bash

if [ $# -ne 2 ]
then
    echo "Usage: $0 <file> <prefix>"
    exit
fi

k=0
s=0

while read str
do
    if [ $str = "End" ]
    then
        break
    else
        if [[ "$str" =~ ^$2.* ]]
        then
            echo $str

            k=$(($k+1))
            s=$(($s+${#str}))
        fi
    fi
done <&0

if [ -f $1 ]
then
    echo "$k siruri, suma=$s" > $1
else
    echo "not a regular file"
fi