how to look for a file with permission denied code example

Example 1: how to silence operation not permitted

Just add "2>/dev/null" at the end of your command pipe as for example:
find . -name log 2>/dev/null

Example 2: hide permission denied ~/.bash

find /path/to/dir -name "search-patter"  2>&1 | grep -v "Permission denied" > output-file
find /etc -name "x*.conf"  2>&1 | grep -v "Permission denied" > output.txt