fergus wrote:
> grep $'\x0d' # e.g. equivalent to grep "^M"
Using that method you're passing the literal character to grep through a
bash quoting mechanism. You can't pass a literal NULL as part of a
command line because argv[] consists of NULL-delimited strings, as do
most C string functions.
Why not just tell grep to look for a NULL rather than trying to feed it
an actual literal NULL character?
$ grep -P '\000'
In pcre regexps you can use \nnn to match any character represented by
octal nnn. This would work for any character, and it doesn't rely on a
bash-specific shell feature. But it does rely on grep supporting -P for
pcre, which is not universal. If that cannot be relied on then you can
use
$ perl -ne 'print if m/\000/'
or
$ awk '/\000/ { print }'
Brian
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