--- title: 'Linux Tips' url: 'https://www.twelvetone.tv/docs/technology-links/tips/linux-tips' markdown: 'https://www.twelvetone.tv/docs/technology-links/tips/linux-tips.md' date: '2026-09-25' description: "Getting top 5 folder sizes (recursive) in the current directory du -hs * | sort -rh | head -5 Recursive File Count In A Directory This command is useful for finding a cache directory with 1000's of files. find . -type f | wc -l Replace . with path if you want a count from other than the current dir…" taxonomy: category: - docs --- [](#) [ Home ](https://www.twelvetone.tv/docs/) [ Technology Links ](https://www.twelvetone.tv/docs/technology-links) [ Tips ](https://www.twelvetone.tv/docs/technology-links/tips) Linux Tips # Getting top 5 folder sizes (recursive) in the current directory ```sh du -hs * | sort -rh | head -5 ``` # Recursive File Count In A Directory This command is useful for finding a cache directory with 1000's of files. ```bash find . -type f | wc -l ``` Replace `.` with path if you want a count from other than the current directory. # Empty File Content by Redirecting to Null The easiest way to empty or blank a file content is by using shell redirect null (non-existent object) to the file: ``` root@server# > access.log ``` # Checking Disk Performance ``` sudo hdparm -Tt /dev/sda ``` # RAID Resize Array - Launch RAID utility - Create a new logical array with 1 or more drives - Launch OS from USB - Copy disk, including all partitions from old array - Remove old array and reboot without USB to make sure it works - Launch OS (with GParted) from USB and resize partitions as needed - Resize LVM to fill partition - Resize file system to fill LVM # Create a directory that also creates parent paths ```bash mkdir -p foo/bar/baz ``` --- ## Navigation - Parent: [Tips](https://www.twelvetone.tv/docs/technology-links/tips.md) - Next: [LVM](https://www.twelvetone.tv/docs/technology-links/tips/lvm.md)