Now the output will be just one line showing the total size of the directory: 100K tutorials Show the disk usage by multiple directories If you find the output of the du command too verbose and would like to see just the total size of the directory in a human readable format, you can use the sum option -s. Show only the total size of the directory in Linux So, when you use the ls command, it treats the directory as a file and shows its size which is one memory block and thus the size displayed is 4KB. A directory is essentially a file that has the information about all the location of all the files it ‘contains’. Now, you probably already know that everything is file in UNIX/Linux. Irrespective of the size of the text on the file, it will be allotted at least one block of 4KB memory on the disk.Īnd since the memory blocks are 4KB in size, the sizes you’ll see will always be in the multiple of 4KB. Is that a coincidence? Not really.Įven if the text of the file is in bytes, the minimum file size is 4K because that’s the minimum block size of the filesystem. In fact, apart from the empty files, all the files are of at least 4 KB in size. I mean all the sizes are in the multiple of 4K. Note that the sizes may seem like that have been rounded off. Now the output will show the files along with the directories: 4.0K tutorials/cpluplus.cppĤ.0K tutorials/target/past/source1/source2/file1.txtĨ.0K tutorials/target/past/source1/source2ġ00K tutorials Bonus Tip: Solving the mystery of 4 KB It would be better if you combine it with -h option to get the sizes in human readable format.
To display the size of files along with the directories, you can use the -a option. Show the sizes of the files as wellĭid you notice that the tutorials directory has several files but they don’t show up in the du command output? It’s because though the file size are counted in the total sum of the directory size, the files are not displayed by default.
This is why using -h option is always a better option. But even if the size is less than 1 MB, it will always show the size as 1MB. You can use -m option for MB and -k option for KB instead of -h. Here’s the much easier to read output now: 8.0K tutorials/target/past/source1/source2 Don’t worry, you can change this behavior and display the directory size in a human readable format with the option -h. Now the problem with the above output of the du command is that you don’t know if the 100 is 100KB or 100MB or 100GB. 8 tutorials/target/past/source1/source2ġ00 tutorials Show disk size in human-readable format This is the output for the tutorials directory. Now if I run the du command in the “tutorials” directory, it will show the sizes of all the subdirectories and then sum the sizes of all the subdirectories and the files at the bottom of it. Here’s the structure of the “tutorials” directory I am going to use in this tutorial: tree tutorials Let’s see how to use the du command to get the file and directory size information in Linux. The syntax for the du command is pretty simple. I am going to show you various examples of the du command that you can use to check the directory size and the disk utilization. Using du command to get directory size in Linux This will give you the total size of the said directory in human-readable format, i.e. If you want to check the directory size in Linux, you can use this command: du -sh path_to_directory For the moment, let’s focus on getting the directory size. I’ll explain the logic behind the 4.0K size for the directories later in this tutorial. The size of a folder or directory in Linux can be found using the du command. That cannot be correct, can it be? Of course not. The ls command shows the size of all the directories as 4 KB. rw-rw-r- 1 abhishek abhishek 55 Mar 11 16:28 text-file.txt rwxrw-r- 1 abhishek abhishek 72 Jan 21 15:44 sleep.shĭrwxr-xr-x 3 abhishek abhishek 4.0K Jan 4 20:10 targetĭrwxr-xr-x 2 abhishek abhishek 4.0K Apr 16 18:27 test_dir rw-r-r- 1 abhishek abhishek 356 Dec 11 21:35 sherlock.txt rw-r-r- 1 abhishek abhishek 19K Mar 18 18:46 services rw-r-r- 1 abhishek abhishek 163 Apr 13 15:07 prog.py rw-rw-r- 1 abhishek abhishek 95 Feb 11 13:12 cpluplus.cpp rwxr-r- 1 abhishek abhishek 140 Mar 22 16:41 bash_script.sh rw-r-r- 1 abhishek abhishek 0 Apr 16 19:53 a.t rwxr-r- 1 abhishek abhishek 456 Mar 6 16:21 agatha.txt All you have to do is to use the -l and -h option with the ls command and it will show you the file size along with file permissions and file timestamps. Knowing the size of a file is easy in Linux.
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