Hi! According to Issue 8 Draft 3, XCU, split, OPTIONS: 114711 −l line_count Specify the number of lines in each resulting file piece. The line_count argument is 114712 an unsigned decimal integer. The default is 1 000. If the input does not end with a 114713 <newline>, the partial line shall be included in the last output file.
This matches verbatim POSIX 1003.2a (Draft 8), Section 5: User
Portability Utilities Option, 5.25 split ‒ Split files into pieces,
5.25.3 Options:
5162 −l line_count
5163 −line_count (Obsolescent.)
5164 Specify the number of lines in each resulting file piece. The
5165 line_count argument is an unsigned decimal integer. The default
5166 is 1000. If the input does not end with a <newline>, the partial
5167 line shall be included in the last output file.
Which was included in Issue 4 (and issues 2 and 3 bore the SysVr1 manual
which was silent about this).
This appears to be invented from whole cloth, since /no/ historical
implementation does this (on display, respectively, V7, SysVr4, SysVr1,
4.3BSD-Tahoe, 4.4BSD-Lite2, coreutils):
$ rm -f xa?; { seq 10; printf abc; } | ./split.v7 -10; head xa[ab]
==> xaa <==
1
2
3
4
5
6
7
8
9
10
==> xab <==
abc$ rm -f xa?; { seq 10; printf abc; } | ./split.sysvr4 -10; head xa[ab]
==> xaa <==
1
2
3
4
5
6
7
8
9
10
==> xab <==
abc$ rm -f xa?; { seq 10; printf abc; } | ./split.sysvr1 -10; head xa[ab]
==> xaa <==
1
2
3
4
5
6
7
8
9
10
==> xab <==
abc$ rm -f xa?; { seq 10; printf abc; } | CSRG/split.4.3tahoe -10; head xa[ab]
==> xaa <==
1
2
3
4
5
6
7
8
9
10
==> xab <==
abc$ rm -f xa?; { seq 10; printf abc; } | CSRG/split.4.4 -10; head xa[ab]
==> xaa <==
1
2
3
4
5
6
7
8
9
10
==> xab <==
abc$ rm -f xa?; { seq 10; printf abc; } | /bin/split -10; head xa[ab]
==> xaa <==
1
2
3
4
5
6
7
8
9
10
==> xab <==
abc$
(i.e. the partial line is treated as a line and is allowed to start xab,
or, indeed, each output file is terminated as soon as it receives
line_count lines).
The illumos gate and NetBSD agree with this historical interpretation.
The only systems I found off-hand that did actually put abc in xaa were
FreeBSD and OpenBSD. I'd argue this is wrong, since ‒ even though they
do match the standard ‒ the standard doesn't match historical practice.
Best,
наб
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