Search keyword from library

#!/bin/bash

input="All_so_path.txt"
while IFS= read -r file;
do
    ret=$(readelf -d $file | grep -n "eisv2")
      #readelf -d $file | grep -n "libc.so"
    if [[ -n $ret ]];then
        printf '%s\n' "$file"
        echo $ret
    fi
done < "$input"