Check folder size in Bash

Question

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

Answer 1

You can do:

du -hs your_directory

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:

du -h your_directory

Tips:

• 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.

Answer 2

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

du -hs /path/to/directory

Update:

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

Answer 3

To check the size of all of the directories within a directory, you can use:

du -h --max-depth=1

Answer 4

Use a summary (-s) and bytes (-b). You can cut the first field of the summary with cut. Putting it all together:

CHECK=$(du -sb /data/sflow_log | cut -f1)

Answer 5

To just get the size of the directory, nothing more:

du --max-depth=0 ./directory

output looks like

5234232       ./directory

Answer 6

if you just want to see the aggregate size of the folder and probably in MB or GB format, please try the below script

$du -s --block-size=M /path/to/your/directory/

Answer 7

# 10GB
SIZE="10"


# check the current size
CHECK="`du -hs /media/662499e1-b699-19ad-57b3-acb127aa5a2b/Aufnahmen`"
CHECK=${CHECK%G*}
echo "Current Foldersize: $CHECK GB"

if (( $(echo "$CHECK > $SIZE" |bc -l) )); then
        echo "Folder is bigger than $SIZE GB"
else
        echo "Folder is smaller than $SIZE GB"
fi

Answer 8

If it helps, You can also create an alias in your .bashrc or .bash_profile.

function dsize()
{
    dir=$(pwd)
    if [ -n "$1" ]; then
            dir=$1
    fi
    du -hs "$dir"
}

This prints the size of the current directory or the directory you have passed as an argument.