stream editor (sed) and basic string operations

check-file-existence.sh

#!/bin/bash
ls | grep _logs |sed 's/_logs//g' | while read line
do
    echo $line
    v1="${line}_logs/${line}_white_list"
    v2="${line}_logs/${line}_class_white_list"
    if [ -f $v1 ]; then
        echo "${v1} exists"
    else
        echo "${v1} does not exist!"
    fi
    if [ -f $v2 ]; then
        echo "${v2} exists"
    else
        echo "${v2} does not exist!"
    fi 
done