How to get the size of a Linux system directory using the du command
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Anyone who has used the Linux system should know that the ls command under the Linux system is usually used to view the contents of the file directory. But have you noticed that the size of each directory displayed by the ls command is only 4 KB? $ ls -lh | grep ^d drwxr-xr-x 3 alvin alvin 4.0K Aug 2 13:57 Bank_Details drwxr-xr-x 2 alvin alvin 4.0K Mar 15 2019 alvin drwxr-xr-x 6 alvin alvin 4.0K Feb 16 2019 drive-alvin drwxr-xr-x 13 alvin alvin 4.0K Jan 6 2019 drive-mageshm drwxr-xr-x 15 alvin alvin 4.0K Sep 29 21:32 Thanu_Photos Actually, this is because everything is a file in Linux. I believe everyone has heard this sentence, so the 4 KB you see is just the file size used to store directory metadata, not the directory size in our usual sense. So the question is, how to get the actual size of the file directory? Don't worry, the du command under Linux can help you. du is the abbreviation of disk usage, which stands for disk usage. It is a standard Unix program used to estimate the usage of file space in the current working directory. The following will take /home/alvin/Documents as an example to introduce the use of the du command. View the total size of a specified directory$ du -hs /home/alvin/Documents or $ du -h --max-depth=0 /home/alvin/Documents/ 20G /home/alvin/Documents Both of the above methods can calculate the total size of the target directory, where:
View the size of each directory (including subdirectories) under the specified directoryRemove the -s option and do not perform a total count. This will display the size of each directory. The following only displays the first 20 items: $ du -h /home/alvin/Documents/ | sort -rh | head -20 20G /home/alvin/Documents/ 9.6G /home/alvin/Documents/drive-alvin 6.3G /home/alvin/Documents/Thanu_Photos 5.3G /home/alvin/Documents/Thanu_Photos/Camera 5.3G /home/alvin/Documents/drive-alvin/Thanu-videos 3.2G /home/alvin/Documents/drive-mageshm 2.3G /home/alvin/Documents/drive-alvin/Thanu-Photos 2.2G /home/alvin/Documents/drive-alvin/Thanu-photos-by-month 916M /home/alvin/Documents/drive-mageshm/Tanisha 454M /home/alvin/Documents/drive-mageshm/2g-backup 415M /home/alvin/Documents/Thanu_Photos/WhatsApp Video 300M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Jan-2017 288M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Oct-2017 226M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Sep-2017 219M /home/alvin/Documents/Thanu_Photos/WhatsApp Documents 213M /home/alvin/Documents/drive-mageshm/photos 163M /home/alvin/Documents/Thanu_Photos/WhatsApp Video/Sent 161M /home/alvin/Documents/Thanu_Photos/WhatsApp Images 154M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/June-2017 150M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Nov-2016 View the size of each file and directory in the specified directoryCombined with the use of wildcard *, the size information of files and directories in the specified directory can be displayed: $ du -hs /home/alvin/Documents/* | sort -rh | head -10 9.6G /home/alvin/Documents/drive-alvin 6.3G /home/alvin/Documents/Thanu_Photos 3.2G /home/alvin/Documents/drive-mageshm 756K /home/alvin/Documents/Bank_Details 272K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-TouchInterface1.png 172K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-NightLight.png 164K /home/alvin/Documents/ConfigServer Security and Firewall (csf) Cheat Sheet.pdf 132K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-Todo.png 112K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-ZorinAutoTheme.png 96K /home/alvin/Documents/distro-info.xlsx View the size of each directory under the specified directory (excluding subdirectories)Use the -S option to exclude subdirectories from the size statistics: $ du -hS /home/alvin/Documents/ | sort -rh | head -20 5.3G /home/alvin/Documents/Thanu_Photos/Camera 5.3G /home/alvin/Documents/drive-alvin/Thanu-videos 2.3G /home/alvin/Documents/drive-alvin/Thanu-Photos 1.5G /home/alvin/Documents/drive-mageshm 831M /home/alvin/Documents/drive-mageshm/Tanisha 454M /home/alvin/Documents/drive-mageshm/2g-backup 300M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Jan-2017 288M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Oct-2017 253M /home/alvin/Documents/Thanu_Photos/WhatsApp Video 226M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Sep-2017 219M /home/alvin/Documents/Thanu_Photos/WhatsApp Documents 213M /home/alvin/Documents/drive-mageshm/photos 163M /home/alvin/Documents/Thanu_Photos/WhatsApp Video/Sent 154M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/June-2017 150M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Nov-2016 127M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Dec-2016 100M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Oct-2016 94M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Nov-2017 92M /home/alvin/Documents/Thanu_Photos/WhatsApp Images 90M /home/alvin/Documents/drive-alvin/Thanu-photos-by-month/Dec-2017 Check the size of the first-level subdirectories in the specified directoryThis is very simple, just set max-depth to 1: $ du -h --max-depth=1 /home/alvin/Documents/ 3.2G /home/alvin/Documents/drive-mageshm 4.0K /home/alvin/Documents/alvin 756K /home/alvin/Documents/Bank_Details 9.6G /home/alvin/Documents/drive-alvin 6.3G /home/alvin/Documents/Thanu_Photos 20G /home/alvin/Documents/ View the size of the specified directory (including statistics function)Using the -c option, we can count the results. We can see that the total size of the files and directories in the specified directory is 20 GB, which is consistent with the size of /home/alvin/Documents/ (20 GB) obtained in the first command above: $ du -hsc /home/alvin/Documents/* | sort -rh | head -10 20G total 9.6G /home/alvin/Documents/drive-alvin 6.3G /home/alvin/Documents/Thanu_Photos 3.2G /home/alvin/Documents/drive-mageshm 756K /home/alvin/Documents/Bank_Details 272K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-TouchInterface1.png 172K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-NightLight.png 164K /home/alvin/Documents/ConfigServer Security and Firewall (csf) Cheat Sheet.pdf 132K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-Todo.png 112K /home/alvin/Documents/user-friendly-zorin-os-15-has-been-released-ZorinAutoTheme.png This is the end of this article about how to get the size of a Linux system directory through the du command. 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