A method to find files on a Linux system is with the well named find command, find allows for certain parameters to be passed allowing for a more specialized and refined search.

find can also be used to execute commands on the returned files.

Simply finding a file by its case sensitive name:

find -name index.php

For the search to not be case sensitive:

find -iname readme.txt

Type

Searching by type;

• c: character devices
• d: directory
• f: regular file
• l: symbolic link

Find files that are of a certain extension:

find / -type f -name "*.log"

Size and time

Search filtering can be done by size too;

• c: bytes
• k: Kilobytes
• M: Megabytes
• G: Gigabytes

All MP4 files greater than 1 Gigabyte:

find / -type f -name "*.mp4" +1G

All MP4 files less than 20 Megabytes:

find / -type f -name "*.mp4" -20M

Time filtering is based around 3 methods:

• Access Time: When the file was read or written to last.
• Change Time: Last time the file’s meta-data was changed.
• Modification Time: Last time the file was modified.

Finding files accessed less than a week ago:

find / -atime -7

Finding with modification time of less than 1 day:

find / -mtime -1

All these commands and filters can be combined to help narrow down or even widen your search.

An example for doing something with the “found” files is this:

find /tmp -type f -name "*.log" -mtime +7 -exec rm -f {} \;

This will delete all the .log files in /tmp that were created over 1 week (7 days) ago.

View the official find docs here or a comprehensive guide here.