tst/file1	tst/file4	=	3	2
tst/file1	tst/file6	=	3	1

tst/file1	tst/file2	=	3	3
tst/file1	tst/file3	=	3	3
tst/file1	tst/file4	=	3	2
tst/file1	tst/file5	=	3	2
tst/file1	tst/file6	=	3	1

tst/file1	tst/file2	=	3	3
tst/file1	tst/file3	=	3	3
tst/file1	tst/file4	=	3	2
tst/file1	tst/file5	=	3	2
tst/file1	tst/file6	=	3	1
tst/file2	tst/file3	=	3	3
tst/file2	tst/file4	=	3	2
tst/file2	tst/file5	=	3	2
tst/file2	tst/file6	=	3	1
tst/file3	tst/file4	=	3	2
tst/file3	tst/file5	=	3	2
tst/file3	tst/file6	=	3	1
tst/file4	tst/file5	=	2	2
tst/file4	tst/file6	=	2	1
tst/file5	tst/file6	=	2	1

Immediate EOF:
samefile: no files left

Immediate EOF, verbose:
0 input filenames.
0 regular files left with size > 0 bytes.
samefile: no files left

One existing file:
samefile: no files left

One non-existing file:
samefile: no files left

Invalid option:

samefile reads a list of filenames from stdin and
writes a list of identical files on stdout.

usage: samefile [-g size] [-l | -r] [-s sep] [-0aiqVvx]

  options:  -0 : input lines are 0 terminated (newline)
            -a : don't sort files with same size alphabetically
            -g : only output files greater than size (0)
            -i : compare even files that are hard linked
            -l : skip checking for hard links
            -q : do not warn when open(2) fails
            -r : report if identical files are hard links
            -s : use sep as separator string for files (tab)
            -V : output version information and exit
            -v : verbose output with statistics on stderr
            -x : do not try to save work by using logic
    default: names which are hard links to the same file
    are neither compared nor output (ex and vi for example).