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NCDU(1) ncdu manual NCDU(1)
ncdu - Использование диска NCurses
ncdu [options] dir
ncdu (NCurses Disk Usage) - это основанная на curses версия хорошо известного du, которая обеспечивает быстрый способ узнать, какие каталоги используют ваше дисковое пространство.
Print a short help message and quit.
-v, -V, --version
Print ncdu version and quit.
Load the given file, which has earlier been created with the "-o" option. If FILE is equivalent to "-", the file is read from
For the sake of preventing a screw-up, the current version of ncdu will assume that the directory information in the imported
file does not represent the filesystem on which the file is being imported. That is, the refresh, file deletion and shell
spawning options in the browser will be disabled.
dir Scan the given directory.
Export all necessary information to FILE instead of opening the browser interface. If FILE is "-", the data is written to
standard output. See the examples section below for some handy use cases.
Be warned that the exported data may grow quite large when exporting a directory with many files. 10.000 files will get you
an export in the order of 600 to 700 KiB uncompressed, or a little over 100 KiB when compressed with gzip. This scales
linearly, so be prepared to handle a few tens of megabytes when dealing with millions of files.
-e Enable extended information mode. This will, in addition to the usual file information, also read the ownership, permissions
and last modification time for each file. This will result in higher memory usage (by roughly ~30%) and in a larger output
file when exporting.
When using the file export/import function, this flag will need to be added both when exporting (to make sure the information
is added to the export), and when importing (to read this extra information in memory). This flag has no effect when
importing a file that has been exported without the extended information.
This enables viewing and sorting by the latest child mtime, or modified time, using 'm' and 'M', respectively.
-0 Don't give any feedback while scanning a directory or importing a file, other than when a fatal error occurs. Ncurses will
not be initialized until the scan is complete. When exporting the data with "-o", ncurses will not be initialized at all.
This option is the default when exporting to standard output.
-1 Similar to "-0", but does give feedback on the scanning progress with a single line of output. This option is the default
when exporting to a file.
In some cases, the ncurses browser interface which you'll see after the scan/import is complete may look garbled when using
this option. If you're not exporting to a file, "-2" is probably a better choice.
-2 Provide a full-screen ncurses interface while scanning a directory or importing a file. This is the only interface that
provides feedback on any non-fatal errors while scanning.
-q Quiet mode. While scanning or importing the directory, ncdu will update the screen 10 times a second by default, this will be
decreased to once every 2 seconds in quiet mode. Use this feature to save bandwidth over remote connections. This option has
no effect when "-0" is used.
-r Read-only mode. This will disable the built-in file deletion feature. This option has no effect when "-o" is used, because
there will not be a browser interface in that case. It has no effect when "-f" is used, either, because the deletion feature
is disabled in that case anyway.
WARNING: This option will only prevent deletion through the file browser. It is still possible to spawn a shell from ncdu and
delete or modify files from there. To disable that feature as well, pass the "-r" option twice (see "-rr").
-rr In addition to "-r", this will also disable the shell spawning feature of the file browser.
List sizes using base 10 prefixes, that is, powers of 1000 (KB, MB, etc), as defined in the International System of Units
(SI), instead of the usual base 2 prefixes, that is, powers of 1024 (KiB, MiB, etc).
Requires a confirmation before quitting ncdu. Very helpful when you accidentally press 'q' during or after a very long scan.
Select a color scheme. Currently only two schemes are recognized: off to disable colors (the default) and dark for a color
scheme intended for dark backgrounds.
These options affect the scanning progress, and have no effect when importing directory information from a file.
-x Do not cross filesystem boundaries, i.e. only count files and directories on the same filesystem as the directory being
Exclude files that match PATTERN. The files will still be displayed by default, but are not counted towards the disk usage
statistics. This argument can be added multiple times to add more patterns.
-X FILE, --exclude-from FILE
Exclude files that match any pattern in FILE. Patterns should be separated by a newline.
Exclude directories containing CACHEDIR.TAG. The directories will still be displayed, but not their content, and they are
not counted towards the disk usage statistics. See http://www.brynosaurus.com/cachedir/
Follow symlinks and count the size of the file they point to. As of ncdu 1.14, this option will not follow symlinks to
directories and will count each symlinked file as a unique file (i.e. unlike how hard links are handled). This is subject to
change in later versions.
(MacOS only) Exclude firmlinks.
(Linux only) Exclude Linux pseudo filesystems, e.g. /proc (procfs), /sys (sysfs).
The complete list of currently known pseudo filesystems is: binfmt, bpf, cgroup, cgroup2, debug, devpts, proc, pstore,
security, selinux, sys, trace.
? Show help + keys + about screen
up, down j, k
Cycle through the items
right, enter, l
Open selected directory
left, <, h
Go to parent directory
n Order by filename (press again for descending order)
s Order by filesize (press again for descending order)
C Order by number of items (press again for descending order)
a Toggle between showing disk usage and showing apparent size.
M Order by latest child mtime, or modified time. (press again for descending order) Requires the -e flag.
d Delete the selected file or directory. An error message will be shown when the contents of the directory do not match or do
not exist anymore on the filesystem.
t Toggle dirs before files when sorting.
g Toggle between showing percentage, graph, both, or none. Percentage is relative to the size of the current directory, graph
is relative to the largest item in the current directory.
c Toggle display of child item counts.
m Toggle display of latest child mtime, or modified time. Requires the -e flag.
e Show/hide 'hidden' or 'excluded' files and directories. Please note that even though you can't see the hidden files and
directories, they are still there and they are still included in the directory sizes. If you suspect that the totals shown at
the bottom of the screen are not correct, make sure you haven't enabled this option.
i Show information about the current selected item.
r Refresh/recalculate the current directory.
b Spawn shell in current directory.
Ncdu will determine your preferred shell from the "NCDU_SHELL" or "SHELL" variable (in that order), or will call "/bin/sh" if
neither are set. This allows you to also configure another command to be run when he 'b' key is pressed. For example, to
spawn the vifm(1) file manager instead of a shell, run ncdu as follows:
Entries in the browser interface may be prefixed by a one-character flag. These flags have the following meaning:
! An error occurred while reading this directory.
. An error occurred while reading a subdirectory, so the indicated size may not be correct.
< File or directory is excluded from the statistics by using exclude patterns.
> Directory is on another filesystem.
^ Directory is excluded from the statistics due to being a Linux pseudo filesystem.
@ This is neither a file nor a folder (symlink, socket, ...).
H Same file was already counted (hard link).
e Empty directory.
To scan and browse the directory you're currently in, all you need is a simple:
If you want to scan a full filesystem, your root filesystem, for example, then you'll want to use "-x":
ncdu -x /
Since scanning a large directory may take a while, you can scan a directory and export the results for later viewing:
ncdu -1xo- / | gzip >export.gz
# ...some time later:
zcat export.gz | ncdu -f-
To export from a cron job, make sure to replace "-1" with "-0" to suppress any unnecessary output.
You can also export a directory and browse it once scanning is done:
ncdu -o- | tee export.file | ./ncdu -f-
The same is possible with gzip compression, but is a bit kludgey:
ncdu -o- | gzip | tee export.gz | gunzip | ./ncdu -f-
To scan a system remotely, but browse through the files locally:
ssh -C user@system ncdu -o- / | ./ncdu -f-
The "-C" option to ssh enables compression, which will be very useful over slow links. Remote scanning and local viewing has two
major advantages when compared to running ncdu directly on the remote system: You can browse through the scanned directory on the
local system without any network latency, and ncdu does not keep the entire directory structure in memory when exporting, so you
won't consume much memory on the remote system.
Every disk usage analysis utility has its own way of (not) counting hard links. There does not seem to be any universally agreed
method of handling hard links, and it is even inconsistent among different versions of ncdu. This section explains what each
version of ncdu does.
ncdu 1.5 and below does not support any hard link detection at all: each link is considered a separate inode and its size is
counted for every link. This means that the displayed directory sizes are incorrect when analyzing directories which contain hard
ncdu 1.6 has basic hard link detection: When a link to a previously encountered inode is detected, the link is considered to have
a file size of zero bytes. Its size is not counted again, and the link is indicated in the browser interface with a 'H' mark.
The displayed directory sizes are only correct when all links to an inode reside within that directory. When this is not the
case, the sizes may or may not be correct, depending on which links were considered as "duplicate" and which as "original". The
indicated size of the topmost directory (that is, the one specified on the command line upon starting ncdu) is always correct.
ncdu 1.7 and later has improved hard link detection. Each file that has more than two links has the "H" mark visible in the
browser interface. Each hard link is counted exactly once for every directory it appears in. The indicated size of each directory
is therefore, correctly, the sum of the sizes of all unique inodes that can be found in that directory. Note, however, that this
may not always be same as the space that will be reclaimed after deleting the directory, as some inodes may still be accessible
from hard links outside it.
Directory hard links are not supported. They will not be detected as being hard links, and will thus be scanned and counted
Some minor glitches may appear when displaying filenames that contain multibyte or multicolumn characters.
All sizes are internally represented as a signed 64bit integer. If you have a directory larger than 8 EiB minus one byte, ncdu
will clip its size to 8 EiB minus one byte. When deleting items in a directory with a clipped size, the resulting sizes will be
Item counts are stored in a signed 32-bit integer without overflow detection. If you have a directory with more than 2 billion
files, quite literally anything can happen.
On macOS 10.15 and later, running ncdu on the root directory without `--exclude-firmlinks` may cause directories to be scanned
and counted multiple times. Firmlink cycles are currently (1.15.1) not detected, so it may also cause ncdu to get stuck in an
infinite loop and eventually run out of memory.
Please report any other bugs you may find at the bug tracker, which can be found on the web site at https://dev.yorhel.nl/ncdu
Written by Yoran Heling <firstname.lastname@example.org>.
ncdu-1.15 2020-06-07 NCDU(1)