On 6/4/20 3:27 PM, Paul Eggert wrote:
On 6/4/20 12:30 PM, Andi Kleen wrote:
in your definition would
echo -n foo > file
(so no newline, but non zero length)
No, the file has zero length:
$ echo -n >file
You missed the 'echo -n foo' that prints 3 bytes to file.
$ ls -l file
-rw-r--r-- 1 eggert eggert 0 Jun 4 13:24 file
have one or zero lines?
Empty files have no lines.
On 6/4/20 1:13 PM, Eric Blake wrote:
The most intuitive behavior is that grep behaves as if the file included the
trailing newline
That's what grep does with files that end in a non-newline byte; such files are
also not text files so POSIX does not specify the behavior.
I answered the question about the 3-byte file. The 0-byte file _IS_ a
text file, consisting of zero lines.
But grep, like other
GNU tools, treats empty files as if they contain no lines; this matches most
people's intuition.
POSIX actually requires this behavior for an empty file.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
