Provided by: jdupes_1.9-1_amd64 
NAME
jdupes - finds and performs actions upon duplicate files
SYNOPSIS
jdupes [ options ] DIRECTORY ...
DESCRIPTION
Searches the given path(s) for duplicate files. Such files are found by comparing file sizes, then
partial and full file hashes, followed by a byte-by-byte comparison.
OPTIONS
-@ --loud
output annoying low-level debug info while running
-1 --one-file-system
do not match files that are on different filesystems or devices
-A --nohidden
exclude hidden files from consideration
-B --dedupe
issue the btrfs same-extents ioctl to trigger a deduplication on disk. The program must be built
with btrfs support for this option to be available
-D --debug
if this feature is compiled in, show debugging statistics and info at the end of program execution
-d --delete
prompt user for files to preserve, deleting all others (see CAVEATS below)
-f --omitfirst
omit the first file in each set of matches
-H --hardlinks
normally, when two or more files point to the same disk area they are treated as non-duplicates;
this option will change this behavior
-h --help
displays help
-i --reverse
reverse (invert) the sort order of matches
-I --isolate
isolate each command-line parameter from one another; only match if the files are under different
parameter specifications
-L --linkhard
replace all duplicate files with hardlinks to the first file in each set of duplicates
-m --summarize
summarize duplicate files information
-N --noprompt
when used together with --delete, preserve the first file in each set of duplicates and delete the
others without prompting the user
-n --noempty
exclude zero-length files from consideration; this option is the default behavior and does nothing
(also see -z/--zeromatch)
-O --paramorder
parameter order preservation is more important than the chosen sort; this is particularly useful
with the -N option to ensure that automatic deletion behaves in a controllable way
-o --order=WORD
order files according to WORD: time - sort by modification time name - sort by filename (default)
-p --permissions
don't consider files with different owner/group or permission bits as duplicates
-Q --quick
[WARNING: RISK OF DATA LOSS, SEE CAVEATS] skip byte-for-byte verification of duplicate pairs (use
hashes only)
-q --quiet
hide progress indicator
-R --recurse:
for each directory given after this option follow subdirectories encountered within (note the ':'
at the end of option; see the Examples section below for further explanation)
-r --recurse
for every directory given follow subdirectories encountered within
-l --linksoft
replace all duplicate files with symlinks to the first file in each set of duplicates
-S --size
show size of duplicate files
-s --symlinks
follow symlinked directories
-v --version
display jdupes version and compilation feature flags
-x --xsize=[+]SIZE (NOTE: deprecated in favor of -X)
exclude files of size less than SIZE from consideration, or if SIZE is prefixed with a '+' i.e.
jdupes -x +226 [files] then exclude files larger than SIZE. Suffixes K/M/G can be used.
-X --exclude=spec:info
exclude files based on specified criteria; supported specs are:
`size[+-=]:number[suffix]'
Match only if size is greater (+), less than (-), or equal to (=) the specified number,
with an optional multiplier suffix. The +/- and = specifiers can be combined; ex
:"size+=4K" will match if size is greater than or equal to four kilobytes (4096 bytes).
Suffixes supported are K/M/G/T/P/E with a B or iB extension (all case-insensitive); no
extension or an IB extension specify binary multipliers while a B extension specifies
decimal multipliers (ex: 4K or 4KiB = 4096, 4KB = 4000.)
-z --zeromatch
consider zero-length files to be duplicates; this replaces the old default behavior when -n was
not specified
-Z --softabort
if the user aborts the program (as with CTRL-C) act on the matches that were found before the
abort was received. For example, if -L and -Z are specified, all matches found prior to the abort
will be hard linked. The default behavior without -Z is to abort without taking any actions.
NOTES
A set of arrows are used in hard linking to show what action was taken on each link candidate. These
arrows are as follows:
----> This file was successfully hard linked to the first file in the duplicate chain
-@@-> This file was successfully symlinked to the first file in the chain
-==-> This file was already a hard link to the first file in the chain
-//-> Linking this file failed due to an error during the linking process
Duplicate files are listed together in groups with each file displayed on a separate line. The groups are
then separated from each other by blank lines.
EXAMPLES
jdupes a --recurse: b
will follow subdirectories under b, but not those under a.
jdupes a --recurse b
will follow subdirectories under both a and b.
jdupes -O dir1 dir3 dir2
will always place 'dir1' results first in any match set (where relevant)
CAVEATS
Using -1 or --one-file-system prevents matches that cross filesystems, but a more relaxed form of this
option may be added that allows cross-matching for all filesystems that each parameter is present on.
When using -d or --delete, care should be taken to insure against accidental data loss.
-Z or --softabort used to be --hardabort in jdupes prior to v1.5 and had the opposite behavior.
Defaulting to taking action on abort is probably not what most users would expect. The decision to invert
rather than reassign to a different switch was made because this feature was still fairly new at the time
of the change.
The -O or --paramorder option allows the user greater control over what appears in the first position of
a match set, specifically for keeping the -N option from deleting all but one file in a set in a
seemingly random way. All directories specified on the command line will be used as the sorting order of
result sets first, followed by the sorting algorithm set by the -o or --order option. This means that the
order of all match pairs for a single directory specification will retain the old sorting behavior even
if this option is specified.
When used together with options -s or --symlink, a user could accidentally preserve a symlink while
deleting the file it points to.
Furthermore, when specifying a particular directory more than once, all files within that directory will
be listed as their own duplicates, leading to data loss should a user preserve a file without its
"duplicate" (the file itself!).
The -Q or --quick option only reads each file once, hashes it, and performs comparisons based solely on
the hashes. There is a small but significant risk of a hash collision which is the purpose of the
failsafe byte-for-byte comparison that this option explicitly bypasses. Do not use it on ANY data set for
which any amount of data loss is unacceptable. This option is not included in the help text for the
program due to its risky nature. You have been warned!
REPORTING BUGS
Send all bug reports to jody@jodybruchon.com or use the Issue tracker at http://github.com/jbruchon/jdupes/issues
AUTHOR
jdupes is a fork of 'fdupes' which is maintained by and contains extra code copyrighted by Jody Bruchon
<jody@jodybruchon.com>
jdupes was once called 'fdupes-jody' but the name was changed at the request of Adrian Lopez to avoid
confusion between the two programs.
Based on 'fdupes' created by Adrian Lopez <adrian2@caribe.net>
FDUPES(1)