Finding large and old files with find

Useful tests

-size +500M (larger than 500 MiB), -mtime +30 (modified more than 30 days ago), -name '*.log', -type f (files only), -xdev (do not cross into other file systems).

Showing sizes

Add '-exec ls -lh {} +' to see sizes, or use GNU find's -printf, for example -printf '%s %p\n', and sort the output.

Deleting safely

-delete removes every match immediately. Run the same command without -delete first, read the list, then add -delete as the last option.

How to find files over 1 GB

1. Run: sudo find / -xdev -type f -size +1G -exec ls -lh {} +
2. Identify each file's owner program before removing it.
3. For old logs, preview: sudo find /var/log -type f -name '*.gz' -mtime +30
4. Only then delete: sudo find /var/log -type f -name '*.gz' -mtime +30 -delete

Cautions

• Placing -delete before the tests deletes everything under the path.
• Database, virtual-disk and swap files are large on purpose: do not delete them.

Sources

• find(1)
• du(1)