Simple Linux Find Command
find . -name "name-of-file"
Find a File by Name and Delete it
find . -type f -name "name-of-the-file.bak" -exec rm {} \;
Linux Find Command – Find Content in Files
How to find content on a specific line of a file
Using sed:
sed '5!d' file
Using awk:
awk 'NR==5' file