GNU bug report logs - #46048
split -n K/N loses data, sum of output files is smaller than input file.

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From: Paul Hirst <contact <at> phirst.org>
To: 46048 <at> debbugs.gnu.org
Subject: bug#46048: split -n K/N loses data, sum of output files is smaller than input file.
Date: Fri, 22 Jan 2021 18:58:03 -1000

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split --number K/N appears to lose data in, with the sum of the sizes of
the output files being smaller than the original input file by 131072 bytes.

$ split --version
split (GNU coreutils) 8.30
...

$ head -c 1000000 < /dev/urandom > test.dat
$ split --number=1/4 test.dat > t1
$ split --number=2/4 test.dat > t2
$ split --number=3/4 test.dat > t3
$ split --number=4/4 test.dat > t4

$ ls -l
-rw-r--r-- 1 user user  250000 Jan 22 18:36 t1
-rw-r--r-- 1 user user  250000 Jan 22 18:36 t2
-rw-r--r-- 1 user user  250000 Jan 22 18:36 t3
-rw-r--r-- 1 user user  118928 Jan 22 18:36 t4
-rw-r--r-- 1 user user 1000000 Jan 22 18:33 test.dat

Surely this should not be the case?

Paul

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