Provided by: duc-nox_1.4.5-1_amd64 bug

NAME

       duc - index, query and graph disk usage

SYNOPSIS

       duc subcommand options

DESCRIPTION

       Duc is a collection of tools for inspecting and visualizing disk usage.

       Duc maintains an indexed database of accumulated sizes of directories of your file system,
       and allows you to query this database with some tools, or create fancy sunburst graphs  to
       show you where your bytes are.

       Duc  scales quite well, it has been tested on systems with more then 500 million files and
       several petabytes of storage.

USAGE

       Duc comes with a command line tool called duc, which is used to create, maintain and query
       the  disk  usage  database.  run  duc  help  to get a list of available commands. duc help
       <subcommand> describes the usage of a specific subcommand.  Run  duc  help  --all  for  an
       extensive list of all commands and their options.

       Some  commands might not be available on your system, depending on the exact configuration
       chosen when building Duc. (For example, the duc  gui  command  is  not  available  in  the
       duc-nox package on Debian and Ubuntu)

       Duc  allows any option to be placed either on the command line or in a configuration file.
       Options on the command line are preceded by a double-leading-dash (--option), some options
       have  a  corresponding  short option which can be used as well with a single leading dash.
       (-o)

       At startup duc tries to read its configuration from three  locations  in  this  particular
       order: /etc/ducrc, ~/.config/duc/ducrc, ~/.ducrc and ./.ducrc.

       A  configuration file consists of sections and parameters. The section names correspond to
       the duc subcommands for which the parameters in that section apply. A section begins  with
       the  name  of  the section in square brackets and continues until the next section begins.
       Sections contain parameters, one per line, which consist  of  a  single  option  name  for
       boolean  flags,  or  an  option  name  and a value for options which take a value. See the
       EXAMPLES section for an example of the configuration file format.

CREATING THE INDEX

       Duc needs an index file of the file system before it is able to show any  information.  To
       create  the index, run the duc index command. For example, to create an index of your home
       directory run duc index ~

           $ duc index /usr
           Skipping lost+found: Permission denied
           Indexed 333823 files and 48200 directories, (35.0GB total) in 1 seconds

       The default location of the  database  is  $HOME/.duc.db.  To  use  a  different  database
       location,  use the DUC_DATABASE environment variable or specify the database location with
       the --database argument.

       You can run duc index at any time later to rebuild the index.

       By default Duc indexes  all  directories  it  encounters  during  file  system  traversal,
       including  special  file systems like /proc and /sys, and network file systems like NFS or
       Samba mounts. There are a few options to select what parts of your filesystem you want  to
       include  or  exclude  from  the  scan,  check  the  documentation  below  for  the options
       --one-file-system, --exclude, --fs-exclude and --fs-include for more details.

QUERYING THE INDEX

       Duc has various subcommands for querying or exploring the index: (Note that  depending  on
       your configuration, some of these commands might not be available)

       ○   duc  info  shows a list of available directory trees in the database, and the time and
           date of the last scan.

       ○   duc ls lists all files and directories under the given path on the console.

       ○   duc ui runs a ncurses based console user  interface  for  exploring  the  file  system
           usage.

       ○   duc  gui starts a graphical (X11) interface representing the file system in a sunburst
           graph. Click on a directory to redraw the graph from the perspective of  the  selected
           directory. Click in the center of the graph to go up one directory in the tree.

OPTIONS

       This section list all available subcommands and describes their usage and options.

   Global options
       These options apply to all Duc subcommands:

       --debug
              increase verbosity to debug level

       -h, --help
              show help

       -q, --quiet
              quiet mode, do not print any warning

       -v, --verbose
              increase verbosity

       --version
              output version information and exit

   duc help
       Options for command duc help [options]:

       -a, --all
              show complete help for all commands

   duc index
       The  'index' subcommand performs a recursive scan of the given paths on the filesystem and
       calculates the inclusive size of all directories. The results are written  to  the  index,
       and can later be queried by one of the other duc tools.

       Options for command duc index [options] PATH ...:

       -b, --bytes
              show file size in exact number of bytes

       -d, --database=VAL
              use database file VAL

       -e, --exclude=VAL
              exclude files matching VAL

       -H, --check-hard-links
              count  hard links only once. if two or more hard links point to the same file, only
              one of the hard links is displayed and counted

       -f, --force
              force writing in case of corrupted db

       --fs-exclude=VAL
              exclude file system type VAL during indexing. VAL is a comma separated list of file
              system types as found in your systems fstab, for example ext3,ext4,dosfs

       --fs-include=VAL
              include file system type VAL during indexing. VAL is a comma separated list of file
              system types as found in your systems fstab, for example ext3,ext4,dosfs

       --hide-file-names
              hide file names in index (privacy). the names of directories will be preserved, but
              the names of the individual files will be hidden

       -U, --uid=VAL
              limit index to only files/dirs owned by uid

       -u, --username=VAL
              limit index to only files/dirs owned by username

       -m, --max-depth=VAL
              limit  directory  names to given depth. when this option is given duc will traverse
              the complete file system, but will only the first VAL levels of directories in  the
              database to reduce the size of the index

       -x, --one-file-system
              skip directories on different file systems

       -p, --progress
              show progress during indexing

       --dry-run
              do not update database, just crawl

       --uncompressed
              do  not  use  compression  for  database. Duc enables compression if the underlying
              database supports this. This reduces index size at  the  cost  of  slightly  longer
              indexing time

   duc info
       Options for command duc info [options]:

       -a, --apparent
              show apparent instead of actual file size

       -b, --bytes
              show file size in exact number of bytes

       -d, --database=VAL
              select database file to use [~/.duc.db]

   duc ls
       The 'ls' subcommand queries the duc database and lists the inclusive size of all files and
       directories on the given path. If no path  is  given  the  current  working  directory  is
       listed.

       Options for command duc ls [options] [PATH]...:

       -a, --apparent
              show apparent instead of actual file size

       --ascii
              use ASCII characters instead of UTF-8 to draw tree

       -b, --bytes
              show file size in exact number of bytes

       -F, --classify
              append file type indicator (one of */) to entries

       -c, --color
              colorize output (only on ttys)

       --count
              show number of files instead of file size

       -d, --database=VAL
              select database file to use [~/.duc.db]

       -D, --directory
              list directory itself, not its contents

       --dirs-only
              list only directories, skip individual files

       --full-path
              show full path instead of tree in recursive view

       -g, --graph
              draw graph with relative size for each entry

       -l, --levels=VAL
              traverse up to ARG levels deep [4]

       -n, --name-sort
              sort output by name instead of by size

       -R, --recursive
              recursively list subdirectories

   duc xml
       Options for command duc xml [options] [PATH]:

       -a, --apparent
              interpret min_size/-s value as apparent size

       -d, --database=VAL
              select database file to use [~/.duc.db]

       -x, --exclude-files
              exclude file from xml output, only include directories

       -s, --min_size=VAL
              specify min size for files or directories

   duc json
       Options for command duc json [options] [PATH]:

       -a, --apparent
              interpret min_size/-s value as apparent size

       -d, --database=VAL
              select database file to use [~/.duc.db]

       -x, --exclude-files
              exclude file from json output, only include directories

       -s, --min_size=VAL
              specify min size for files or directories

   duc graph
       The 'graph' subcommand queries the duc database and generates a sunburst graph showing the
       disk usage of the given path. If no path is given a  graph  is  created  for  the  current
       working directory.

       By  default  the  graph is written to the file 'duc.png', which can be overridden by using
       the -o/--output option. The output can be sent to stdout by using the  special  file  name
       '-'.

       Options for command duc graph [options] [PATH]:

       -a, --apparent
              Show apparent instead of actual file size

       -d, --database=VAL
              select database file to use [~/.duc.db]

       --count
              show number of files instead of file size

       --dpi=VAL
              set destination resolution in DPI [96.0]

       -f, --format=VAL
              select output format png|svg|pdf|html [png]

       --fuzz=VAL
              use radius fuzz factor when drawing graph [0.7]

       --gradient
              draw graph with color gradient

       -l, --levels=VAL
              draw up to ARG levels deep [4]

       -o, --output=VAL
              output file name [duc.png]

       --palette=VAL
              select  palette.  available  palettes  are:  size,  rainbow, greyscale, monochrome,
              classic

       --ring-gap=VAL
              leave a gap of VAL pixels between rings

       -s, --size=VAL
              image size [800]

   duc cgi
       Options for command duc cgi [options] [PATH]:

       -a, --apparent
              Show apparent instead of actual file size

       -b, --bytes
              show file size in exact number of bytes

       --count
              show number of files instead of file size

       --css-url=VAL
              url of CSS style sheet to use instead of default CSS

       -d, --database=VAL
              select database file to use [~/.duc.db]

       --dpi=VAL
              set destination resolution in DPI [96.0]

       --footer=VAL
              select HTML file to include as footer

       --fuzz=VAL
              use radius fuzz factor when drawing graph [0.7]

       --gradient
              draw graph with color gradient

       --header=VAL
              select HTML file to include as header

       -l, --levels=VAL
              draw up to ARG levels deep [4]

       --list generate table with file list

       --palette=VAL
              select palette. available  palettes  are:  size,  rainbow,  greyscale,  monochrome,
              classic

       --ring-gap=VAL
              leave a gap of VAL pixels between rings

       -s, --size=VAL
              image size [800]

       --tooltip
              enable  tooltip  when  hovering  over the graph. enabling the tooltip will cause an
              asynchronous HTTP request every time the mouse is moved and  can  greatly  increase
              the HTTP traffic to the web server

   duc gui
       The  'gui'  subcommand  queries the duc database and runs an interactive graphical utility
       for exploring the disk usage of the given path. If no path is given  the  current  working
       directory is explored.

       The following keys can be used to navigate and alter the graph:

           +           increase maximum graph depth
           -           decrease maximum graph depth
           0           Set default graph depth
           a           Toggle between apparent and actual disk usage
           b           Toggle between exact byte count and abbreviated sizes
           c           Toggle between file size and file count
           f           toggle graph fuzz
           g           toggle graph gradient
           p           toggle palettes
           backspace   go up one directory

       Options for command duc gui [options] [PATH]:

       -a, --apparent
              show apparent instead of actual file size

       -b, --bytes
              show file size in exact number of bytes

       --count
              show number of files instead of file size

       --dark use dark background color

       -d, --database=VAL
              select database file to use [~/.duc.db]

       --fuzz=VAL
              use radius fuzz factor when drawing graph

       --gradient
              draw graph with color gradient

       -l, --levels=VAL
              draw up to VAL levels deep [4]

       --palette=VAL
              select  palette.  available  palettes  are:  size,  rainbow, greyscale, monochrome,
              classic

       --ring-gap=VAL
              leave a gap of VAL pixels between rings

   duc ui
       The 'ui' subcommand queries the duc database and runs an interactive ncurses  utility  for
       exploring  the  disk  usage  of  the  given  path. If no path is given the current working
       directory is explored.

       The following keys can be used to navigate and alter the file system:

           up, pgup, j:     move cursor up
           down, pgdn, k:   move cursor down
           home, 0:         move cursor to top
           end, $:          move cursor to bottom
           left, backspace: go up to parent directory (..)
           right, enter:    descent into selected directory
           a:               toggle between actual and apparent disk usage
           b:               toggle between exact and abbreviated sizes
           c:               Toggle between file size and file count
           h:               show help. press 'q' to return to the main screen
           n:               toggle sort order between 'size' and 'name'
           o:               try to open the file using xdg-open
           q, escape:       quit

       Options for command duc ui [options] [PATH]:

       -a, --apparent
              show apparent instead of actual file size

       -b, --bytes
              show file size in exact number of bytes

       --count
              show number of files instead of file size

       -d, --database=VAL
              select database file to use [~/.duc.db]

       -n, --name-sort
              sort output by name instead of by size

       --no-color
              do not use colors on terminal output

CGI INTERFACING

       The duc binary has support for a rudimentary CGI interface,  currently  only  tested  with
       apache. The CGI interface generates a simple HTML page with a list of indexed directories,
       and shows a clickable graph for navigating the file system. If the option --list is given,
       a list of top sized files/dirs is also written.

       Configuration  is  done  by creating a simple shell script as .cgi in a directory which is
       configured for CGI execution by your web  server  (usually  /usr/lib/cgi-bin).  The  shell
       script should simply start duc, and pass the location of the database to navigate.

       An example duc.cgi script would be

           #!/bin/sh
           /usr/local/bin/duc cgi -d /home/jenny/.duc.db

       ○   Make sure the database file is readable by the user (usually www-data)

       ○   Debugging is best done by inspecting the web server's error log

       ○   Make sure the .cgi script has execute permissions (chmod +x duc.cgi)

       Some notes:

       ○   The HTML page is generated with a simple embedded CSS style sheet. If the style is not
           to your liking you can provide an external CSS url with  the  --css-url  option  which
           will then be used instead of the embedded style definition.

       ○   Add  the  option  --list to generate a table of top sized files and directories in the
           HTML page.

       ○   The options --header and --footer allow you to insert your own HTML  code  before  and
           after the main.

       The  current  CGI configuration is not very flexible, nor secure. It is not advised to run
       the CGI from public reachable web servers, use at your own risk.

A NOTE ON FILE SIZE AND DISK USAGE

       The concepts of 'file size' and 'disk usage' can be a bit confusing. Files on disk have an
       apparent  size,  which  indicates  how  much bytes are in the file from the users point of
       view; this is the size reported by tools like ls -l. The apparent size can be any  number,
       from 0 bytes up to several TB. The actual number of bytes which are used on the filesystem
       to store the file can differ from this apparent size for a number of reasons: disks  store
       data  in  blocks,  which cause files to always take up a multiple of the block size, files
       can have holes ('sparse' files), and other technical reasons.  This  number  is  always  a
       multiple  of  512, which means that the actual size used for a file is almost always a bit
       more then its apparent size.

       Duc has two modes for counting file sizes:

       ○   apparent size: this is the size as reported by ls.  This  number  indicates  the  file
           length, which is usually smaller then the actual disk usage.

       ○   actual size: this is the size as reported by du and df. The actual file size tells you
           how much disk is actually used by a file, and is always a multiple of 512 bytes.

       The default mode used by duc is to use the 'actual size'. Most duc commands to report disk
       usage  (duc  ls,  duc graph, duc ui, etc) have an option to change between these two modes
       (usually the -a), or use the 'a' key to toggle.

BUILDING from git

       If you use git clone to pull down the latest release, you will have to do the following:

       git clone https://github.com/zevv/duc
       cd duc
       autoreconf -i

       Then you can run the regular

       ./configure [ options ]
       make

       to the regular build of the software.

       A note for Redhat and derivates users. The package providing the development file for lmdb
       (lmdb-devel)  does  not include a lmdb.pc pkgconfig file. This could lead to errors during
       the configure phase:

       checking for LMDB... no
       configure: error: Package requirements (lmdb) were not met:

       To avoid the need to call pkg-config, you may set the environment variables
       LMDB_CFLAGS and LMDB_LIBS:

       LMDB_CFLAGS=" " LMDB_LIBS=-llmdb ./configure --with-db-backend=lmdb [ options ]

EXAMPLES

       Index the /usr directory, writing to the default database location ~/.duc.db:

           $ duc index /usr

       List all files and directories under /usr/local, showing relative file sizes in a graph:

           $ duc ls -Fg /usr/local
             4.7G lib/                 [+++++++++++++++++++++++++++++++++++++++++++]
             3.1G share/               [++++++++++++++++++++++++++++               ]
             2.7G src/                 [++++++++++++++++++++++++                   ]
           814.9M bin/                 [+++++++                                    ]
           196.6M include/             [+                                          ]
            66.6M x86_64-w64-mingw32/  [                                           ]
            59.9M local/               [                                           ]
            38.8M i686-w64-mingw32/    [                                           ]
            20.3M sbin/                [                                           ]
            13.6M lib32/               [                                           ]
            13.3M libx32/              [                                           ]

       or use the -R options for the tree view:

           $ duc ls -RF /etc/logcheck
            24.0K `+- ignore.d.server/
             4.0K  |  `+- hddtemp
             4.0K  |   |- ntpdate
             4.0K  |   |- lirc
             4.0K  |   |- rsyslog
             4.0K  |   `- libsasl2-modules
             8.0K  |- ignore.d.workstation/
             4.0K  |   `- lirc
             8.0K  `- ignore.d.paranoid/
             4.0K      `- lirc

       Start the graphical interface to explore the file system using sunburst graphs:

           $ duc gui /usr

       Generate a graph of /usr/local in .png format:

           $ duc graph -o /tmp/usr.png /usr

       The following sample configuration file defines default parameters for the duc ls and  duc
       ui  commands  and  defines a global option to configure the database path which is used by
       all subcommands

           [global]
           database /var/cache/duc.db

           [ls]
           recursive
           classify
           color

           [ui]
           no-color
           apparent

FREQUENTLY ASKED QUESTIONS

       ○   What does the error 'Database version mismatch mean?'

           The layout of the index database sometimes changes when new features are  implemented.
           When you get this error you have probably upgraded to a newer version. Just remove the
           old database file and rebuild the index.

       ○   Duc crashes with a segmentation fault, is it that buggy?

           By default Duc uses the Tokyocabinet database backend. Tokyocabinet  is  pretty  fast,
           stores  the  database  in  a  single file and has nice compression support to keep the
           database small. Unfortunately, it is not always robust and sometimes chokes on corrupt
           database  files.  Try  to  remove  the  database  and  rebuild the index. If the error
           persists contact the authors.

       ○   Some of the Duc subcommands like duc gui are not available on my system?

           Depending on the configuration that was chosen when building Duc, some  options  might
           or  might  not  be  available in the duc utility. For example, on Debian or Ubuntu Duc
           comes in two flavours: there is a full featured  package  called  duc,  or  a  package
           without  dependencies  on X-windows called duc-nox, for which the latter lacks the duc
           gui command.

       ○   duc index is hogging my system and using a lot of CPU and I/O!

           Traversing a file system is hard work - which is the exact reason why  Duc  exists  in
           the  first  place. You can use the default tools to make Duc behave nice towards other
           processes on your machine, use something like:

           nice 19 ionice -c 3 duc index [options]

           This makes duc index run with the lowest CPU and I/O scheduler  priorities,  which  is
           nicer to all the other processes on your machine.

FILES

       At  startup  duc  tries  to read its configuration from three locations in this particular
       order: /etc/ducrc, ~/.config/duc/ducrc, ~/.ducrc and ./.ducrc.

       Duc mainains an index of scanned directories, which defaults to ~/.duc.db. All tools  take
       the -d/--database option to override the database path.

AUTHORS

       ○   Ico Doornekamp duc@zevv.nl

       ○   John Stoffel john@stoffel.org

       Other contributors can be found in the Git log at GitHub.

LICENSE

       Duc  is free software; you can redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software Foundation; version 2 dated June,
       1991.  Duc  is  distributed  in the hope that it will be useful, but WITHOUT ANY WARRANTY;
       without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE.
       See the GNU General Public License for more details.

                                            July 2022                                      DUC(1)