Removing files older than 30 days

find /path/to/ -type f -mtime +30 -name '*.mp4' -execdir rm -- '{}' \;

• find: the unix command for finding files/directories/links and etc.

• /path/to/: the directory to start your search in.

• -type f: only find files.

• -name ‘*.mp4’: list files that ends with .mp4.

• -mtime +30: only consider the ones with modification time older than 30 days.

• -execdir … \;: for each such result found, do the following command in ….

• rm – ‘{}’: remove the file; the {} part is where the find result gets substituted into from the previous part.