.TH dupmerge 8 "" "dupmerge 1.73" ""
.SH NAME
dupmerge \- hardlink duplicate files.
.SH SYNOPSIS
\fBdupmerge [options]\fP
.SH DESCRIPTION
\fBdupmerge\fP is a utility that scans a Linux directory tree looking 
for pairs of distinct files with identical content. When it finds 
such files, it deletes one file to reclaim it's disk space and then 
recreates its path name as a link to the other copy. It can also 
expand all hard links and reads the list of files from standard input.
.SH OPTIONS
.TP
.B "\-h"
Show help.
.TP
.B "\-V"
Show version number and exit.
.TP
.B "\-d"
Delete multiple files and hard links. Default: Preserve the 
alphabetically first file name.
.TP
.B "\-q"
Quiet mode.
.TP
.B "\-h"
Show help.
.TP
.B "\-q"
Operate in quiet mode (otherwise, re-links are displayed on stdout).
.TP
.B "\-n"
Suppress the actual unlinking and relinking (quiet/dry run mode). 
.TP
.B "\-i"
Inverse switch: Expand all hard links in normal mode, replace files 
by their de spars-ed version if it is bigger.
.TP
.B "\-s"
Flag for soft linking (default is hard linking). This option is beta 
because for linking of all equal files more than one run of dupmerge 
is necessary and the inverse (expanding of soft links) is untested.
.TP
.B "\-S"
Flag for Sparse mode: Replace files by their sparse version if it is 
smaller.
.TP
.B "\-c"
Combo mode: Default mode +sparse mode. With -i it means inverse mode
with unlinking and desparsing.
.SH EXAMPLES
.TP
find ./ -type f -print0 | dupmerge 2>&1 | tee /tmp/user0/dupmerge.out
.SH WARNINGS
.TP
If there is not enough space for expanding the hard links (in inverse 
mode) hard links will be lost! It's also a bad idea to kill dupmerge 
with signal 9 before it finishes because files can be lost or damaged 
or new temporary and maybe big files can remain.
.SH SEE ALSO
find(8).
.SH COPYRIGHT
Copyright Phil Karn May be used under the terms of the GNU Public License.