[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: document that echo can't be given a NULL
|
From: |
Eric Blake |
|
Subject: |
Re: document that echo can't be given a NULL |
|
Date: |
Fri, 10 Mar 2006 18:52:21 +0000 |
> No way to hand echo or /bin/echo a NULL.
You mean NUL, not NULL. And printf can do it.
> $ set a $'\x00' b
> $ echo $#
> 3
> $ echo A$'\x01'B|wc -c
> 4
> $ echo A$'\x00'B|wc -c
> 3
Here, command substitutions strip all NULs from the command's
output. POSIX doesn't specify whether this behavior is allowed
or not, but I think it makes more sense for command substitution
to strip NULs than to risk the inconsistency of arguments being
chopped short as they are passed through exec() calls.
--
Eric Blake