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Man Pages
FDUPES(1) FreeBSD General Commands Manual FDUPES(1)

fdupes - finds duplicate files in a given set of directories

fdupes [ options ] DIRECTORY ...

Searches the given path for duplicate files. Such files are found by comparing file sizes and MD5 signatures, followed by a byte-by-byte comparison.

-r --recurse
for every directory given follow subdirectories encountered within
-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)
-s --symlinks
follow symlinked directories
-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
-G --minsize=SIZE
consider only files greater than or equal to SIZE
-L --maxsize==SIZE
consider only files less than or equal to SIZE
-n --noempty
exclude zero-length files from consideration
-A --nohidden
exclude hidden files from consideration
-f --omitfirst
omit the first file in each set of matches
-1 --sameline
list each set of matches on a single line
-S --size
show size of duplicate files
-t --time
show modification time of duplicate files
-m --summarize
summarize duplicate file information
-q --quiet
hide progress indicator
-d --delete
prompt user for files to preserve, deleting all others (see CAVEATS below)
-P --plain
with --delete, use line-based prompt (as with older versions of fdupes) instead of screen-mode interface
-N --noprompt
when used together with --delete, preserve the first file in each set of duplicates and delete the others without prompting the user
-I --immediate
delete duplicates as they are encountered, without grouping into sets; implies --noprompt
-p --permissions
don't consider files with different owner/group or permission bits as duplicates
-o --order=WORD
order files according to WORD: time - sort by modification time, ctime - sort by status change time, name - sort by filename
-i --reverse
reverse order while sorting
-l --log=LOGFILE
log file deletion choices to LOGFILE
-v --version
display fdupes version
-h --help
displays help

Unless -1 or --sameline is specified, duplicate files are listed together in groups, each file displayed on a separate line. The groups are then separated from each other by blank lines.

When -1 or --sameline is specified, spaces and backslash characters (\) appearing in a filename are preceded by a backslash character.

fdupes a --recurse: b
will follow subdirectories under b, but not those under a.
fdupes a --recurse b
will follow subdirectories under both a and b.

When using -d or --delete, care should be taken to insure against accidental data loss.

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!).

Adrian Lopez <adrian2@caribe.net>


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