How to analyse disk usage in command line linux?

Question

du and df are nice, but I don't know how to filter the data they provide the way I do with SequoiaView. I would like to know which are the largest folders and the largest files in a glance.

Answer 1

You might also want to try the NCurses Disk Usage aka ncdu.

Use it like ncdu -x -q if you're invoking it remotely (e. g. via ssh) and ncdu -x otherwise.

ncdu 1.6 ~ Use the arrow keys to navigate, press ? for help
    --- /home/geek -----------------------------------------------------------------
       27.6MiB  /qm test 1 rework
      312.0kiB  /sidebar
       88.0kiB  /rackerhacker-MySQLTuner-perl-6add618
        8.0kiB  /.w3m
        4.0kiB  /.cache
    e   4.0kiB  /.ssh
      160.0kiB   ng.tar.gz
       76.0kiB   plowshare_1~svn1673-1_all.deb
        4.0kiB   .bashrc
        4.0kiB   .bash_history
        4.0kiB   .profile
        4.0kiB   .htoprc
        4.0kiB   .bash_logout
        0.0  B   .lesshst

This is available under Mac OS X too.

The following flags to the command line might be helpful:

-q Quiet mode, doesn't update the screen 10 times a second
   while scanning, reduces network bandwidth used

-x Don't cross filesystem borders (don't descend into a
   directory which is a mounted disk)

Thanks to Sorin Sbarnea.

Answer 2

Use some combination of the commands and options:

du --max-depth=1 2> /dev/null | sort -n -r | head -n20

to view only the largest few. If you'd like to use it a lot, then bind it to an alias, e.g. in bash by adding to ~/.bashrc

alias largest='du --max-depth=1 2> /dev/null | sort -n -r | head -n20'

Answer 3

You probably want xdu.

du -ax | xdu -n

There's also the more sophisticated KDE-based Filelight.

Answer 4

I usually use

du -hsc * | sort -h

What each option means for du:

• h: show sizes in human readable format (1K, 1M, 1G, ...)
• s: summarize: display only a total for each argument
• c: also display a grand total

The -h option on sort makes it understand the -h format (human readable) on du. This option is relatively new on sort, so maybe your system does not support it and forces you to use du -sc | sort -n instead.

If you do it on a remote machine and the process takes a long time, you probably want to execute this process backgrounded or inside a screen or something similar to prevent a connection loss.

Answer 5

I would like to recommend dutree, which offers a hierachical visualization.

You can select more or less levels of detail, and exclude paths for better control of visualization. You can also compare different paths.

It is implemented in Rust, fast and efficient.

$ dutree -h
Usage: dutree [options] <path> [<path>..]

Options:
    -d, --depth [DEPTH] show directories up to depth N (def 1)
    -a, --aggr [N[KMG]] aggregate smaller than N B/KiB/MiB/GiB (def 1M)
    -s, --summary       equivalent to -da, or -d1 -a1M
    -u, --usage         report real disk usage instead of file size
    -b, --bytes         print sizes in bytes
    -f, --files-only    skip directories for a fast local overview
    -x, --exclude NAME  exclude matching files or directories
    -H, --no-hidden     exclude hidden files
    -A, --ascii         ASCII characters only, no colors
    -h, --help          show help
    -v, --version       print version number

Answer 6

du -h 2> /dev/null | sort -hr | head -n20

du -h gives a human readable list estimate of disk space with a total
2> /dev/null suppresses any errors such as read access denied
sort -hr sorts the human readable file size in reverse order
head -n20 reduce the list to 20

Be aware that read access denied directories and files are excluded

Answer 7

To know which are the largest folders and the largest files in a glance, you can also use the command line tool 'Top Disk Usage' (tdu):

https://unix.stackexchange.com/questions/425615/how-to-get-top-immediate-sub-folders-of-folder-consuming-huge-disk-space-in/501089#501089