Folder size linux bash

Check folder size in Bash

I’m trying to write a script that will calculate a directory size and if the size is less than 10GB, and greater then 2GB do some action. Where do I need to mention my folder name?

# 10GB SIZE="1074747474" # check the current size CHECK="`du /data/sflow_log/`" if [ "$CHECK" -gt "$SIZE" ]; then echo "DONE" fi 

Since this is a popular question — If any beginner is encountering the answers on this question and wants to learn more about what the heck du is and how everyone knows all these commands: You can type man du in your terminal to lookup the du command in the manual. This will display an output which you can view, and will summarize all the flags like -h, -c, -s, -b, -B, —apparent-size, etc. that answers are you suggesting you use. Then, you can decide for yourself how you best want to use du for your specific use case.

8 Answers 8

which will give you a brief output of the size of your target directory. Using a wildcard like * can select multiple directories.

If you want a full listing of sizes for all files and sub-directories inside your target, you can do:

• Add the argument -c to see a Total line at the end. Example: du -hcs or du -hc .
• Remove the argument -h to see the sizes in exact KiB instead of human-readable MiB or GiB formats. Example: du -s or du -cs .

With no directory path specified it will default to the current working directory. so du -hs == du -hs . .

if you just want to see the folder size and not the sub-folders, you can use:

You should know that du shows the used disk space; and not the file size.

You can use —apparent-size if u want to see sum of actual file sizes.

--apparent-size print apparent sizes, rather than disk usage; although the apparent size is usually smaller, it may be larger due to holes in ('sparse') files, internal fragmentation, indirect blocks, and the like 

And of course theres no need for -h (Human readable) option inside a script.

Instead You can use -b for easier comparison inside script.

But You should Note that -b applies —apparent-size by itself. And it might not be what you need.

-b, --bytes equivalent to '--apparent-size --block-size=1' 

so I think, you should use —block-size or -B

#!/bin/bash SIZE=$(du -B 1 /path/to/directory | cut -f 1 -d " ") # 2GB = 2147483648 bytes # 10GB = 10737418240 bytes if [[ $SIZE -gt 2147483648 && $SIZE -lt 10737418240 ]]; then echo 'Condition returned True' fi 

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How to Get the Size of a Directory in Linux

Many users run Linux from the command line. However, the command line — sometimes known as the terminal — doesn’t have an intuitive interface for checking disk space in Linux.

This guide shows you how to find the size of a specific directory in Linux from the command line.

• A system running Linux
• A command line / terminal window (available by clicking Search, then typing terminal)
• A user account with sudo or root privileges

Note: In Linux, a directory is the equivalent of a folder in Windows. A directory may have directories inside (called subdirectories), or it may only contain files.

Option 1: Display the Size of a Directory Using the du Command

The du command stands for disk usage. This command is included by default in most Linux distributions.

You can display the size of your current directory by typing du in the command line:

The system should display a list of the contents of your home directory, with a number to the left. That number is the size of the object in kilobytes.

You can add the -h option to make the output more readable:

Each entry will start with a number and a letter. The number is the amount of space used, and the letter (usually K, M, or G) indicates Kilobytes, Megabytes, or Gigabytes. For example:

400K – 400 kilobytes 7.3M – 7.3 megabytes 2.2G – 2.2 gigabytes

To find the size of a specific directory different from your current working directory. The du command allows you to specify a directory to examine:

This displays the size of the contents of the /var directory. You may see some entries with an error, as in the image below.

This happens when your user account does not have permission to access a particular directory. Use the sudo or su command to get access privileges:

Note: Some versions of Linux don’t enable sudo by default. You can use the su command to switch to the root user account instead.

To display total disk usage of a particular directory, use the -c command:

Options can be combined. If you wanted to repeat the previous command in human-readable format, enter the following:

You can limit the scan to a certain level of subdirectory by using the max-depth option. For example, to scan only the size of the top directory, use —max-depth=0 :

If you wanted to list only the top directory and the first layer of subdirectories, change —max-depth=1 :

If you run into trouble or want to explore more options for the du command, enter the following command to display the help file:

Option 2: Get Size of Directory in Linux Using tree Command

By default, the tree command is not included in some versions of Linux. To install it, enter the following:

The tree command displays a visual representation of your directories. It uses lines to indicate which subdirectories belong where, and it uses colors to indicate directories and files.

tree can also be used with options. To display a human-readable size of the current directory’s subdirectories, enter the following:

Like the du command, tree can target a specific directory:

This command takes a few moments since the /var directory has many entries.

The tree command also has a help file, which you can access by entering:

Option 3: Find the Size of a Linux Directory Using ncdu Command

The ncdu tool stands for NCurses Disk Usage. Like the tree command, it is not installed by default on some versions of Linux. To install it, enter the following:

The ncdu utility is an interactive display of your disk usage. For example, enter the following:

In the upper left corner, it displays the current directory being scanned. A column on the left displays the numerical size, a graph of #- signs to indicate the relative size, and the file or directory.

Use the up and down arrows to select different lines. The right arrow will browse into a directory, and the left arrow will take you back.

ncdu can be used to target a specific directory, for example:

For help, press the ? key inside the ncdu interface. To quit, press the letter q .

Note: Learn how to move directories in Linux using the GUI or system commands.

You now have three different options to find the size of a directory in Linux operating systems.

If you want to learn more about directories in Linux, read our article how to rename directories in Linux.

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How do I get the total size of everything in a directory in one line? [duplicate]

I know I can use du -h to output the total size of a directory. But when it contains other subdirectories, the output would be something like:

du -h /root/test . . . . 24K /root/test/1 64K /root/test/2 876K /root/test/3 1.1M /root/test/4 15M /root/test/5 17M /root/test 

I only want the last line because there are too many small directories in the /root/test directory. What can I do?

2 Answers 2

Add the —max-depth parameter with a value of 0:

Or, use the -s (summary) option:

Either of those should give you what you want. For future reference, man du is very helpful.

+1 with a remark: certain implementations of du do not have the option —max-depth though (Busybox, for example). But the -s option does the trick in this case

-s is standard, —max-depth is GNU specific. The short version ( -d ) will also work in FreeBSD. -h is not standard but supported by a few implementations.

when using -s , sometimes I got warnings like: du: cannot access `/root/test/8393.jpg.tmp’: No such file or directory . What should I do to ignore this? I mean, not solve the warning but don’t let du to output it.

Thanks! Remarks: On macOS 11 Big Sur the option needed for du is -d (as in «depth»). du -d 0 only gives you the size of your current directory («.») without listing the directories in it. du -d 1 if you want a list of directories in the current directory and the total size they consume. du -d 2 if you want to also get the sub-directories listed with their size too. And so on and so forth.

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How do I determine the total size of a directory (folder) from the command line?

The -h flag on sort will consider «Human Readable» size values.

If want to avoid recursively listing all files and directories, you can supply the —max-depth parameter to limit how many items are displayed. Most commonly, —max-depth=1

du -h --max-depth=1 /path/to/directory 

I use du -sh or DOOSH as a way to remember it (NOTE: the command is the same, just the organization of commandline flags for memory purposes)

There is a useful option to du called the —apparent-size. It can be used to find the actual size of a file or directory (as opposed to its footprint on the disk) eg, a text file with just 4 characters will occupy about 6 bytes, but will still show up as taking up ~4K in a regular du -sh output. However, if you pass the —apparent-size option, the output will be 6. man du says: —apparent-size print apparent sizes, rather than disk usage; although the apparent size is usually smaller, it may be larger due to holes in (‘sparse’) files, internal fragmentation, indirect blocks

This works for OS X too! Thanks, I was really looking for a way to clear up files, both on my local machine, and my server, but automated methods seemed not to work. So, I ran du -hs * and went into the largest directory and found out which files were so large. This is such a good method, and the best part is you don’t have to install anything! Definitely deserved my upvote

@BandaMuhammadAlHelal I think there are two reasons: rounding ( du has somewhat peculiar rounding, showing no decimals if the value has more than one digit in the chosen unit), and the classical 1024 vs. 1000 prefix issue. du has an option -B (or —block-size ) to change the units in which it displays values, or you could use -b instead of -h to get the «raw» value in bytes.

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