A few examples on using the Linux find command to list out all files matching a file type. The find command is on just about every Posix based OS, which is Linux, BSD, OSX. It’s a must to know to do sysadmin work.
List out all files in the directory you’re in and below
find . -name \* -print
List out all pdf files
find . -name \*.pdf -print
List out all txt files
find . -name \*.txt -print