[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#24961: input option -z alters behavior of output option -o in an und
From: |
vampyrebat |
Subject: |
bug#24961: input option -z alters behavior of output option -o in an undocumented way |
Date: |
Fri, 18 Nov 2016 00:16:19 -0600 |
This bug report concerns GNU grep 2.25.
Consider this file:
$ cat test
one lone
long
tone
"grep -o", according to the man page and info file, outputs "each [matched]
part on a separate output line." Given that, this command gives the expected
output:
$ grep -o one test
one
one
one
The documentation also states that -z affects only how input is interpreted.
However, adding -z makes -o no longer obey the above-quoted documentation line:
$ grep -zo one test
oneoneone
Hexdump shows that this output has ASCII NULs in place of newlines:
$ grep -zo one test | hexdump -C
00000000 6f 6e 65 00 6f 6e 65 00 6f 6e 65 00 |one.one.one.|
0000000c
Thus, -z changes the line separator used by -o. This might or might not be
desired behavior, but it is certainly not behavior that the documentation leads
one to expect. In other words, I don't know whether this is a software bug or
a documentation bug, only that the two don't agree.
- bug#24961: input option -z alters behavior of output option -o in an undocumented way,
vampyrebat <=