Problem with grep

Question

Broken:
boogie:~> pacman -Q | grep grep
grep 2.5.3-2
boogie:~> echo j | grep "[A-Z]"
j
boogie:~>
Not broken:
froggie:~> pacman -Q | grep grep
grep 2.5.1a-2
froggie:~> echo j | grep "[A-Z]"
froggie:~>

Answer 1

MrWeatherbee wrote:
shining wrote:It's because of LC_ALL, it wasn't set here, and it worked fine.
I set it and I got the bug.
I don't think it's a bug based on this documentation:
Within a bracket expression, a range expression consists of two characters separated by a hyphen. It matches any single character that sorts between the two characters, inclusive, using the locale's collating sequence and character set. For example, in the default C locale, `[a-d]' is equivalent to `[abcd]'. Many locales sort characters in dictionary order, and in these locales `[a-d]' is typically not equivalent to `[abcd]'; it might be equivalent to `[aBbCcDd]', for example. To obtain the traditional interpretation of bracket expressions, you can use the C locale by setting the LC_ALL environment variable to the value `C'.
LC_COLLATE, I believe, is the really critical value. So, for example, in Dolby's case, unsetting LC_ALL by itself won't do any good because he has LC_COLLATE set to 'en_US.utf8'. LC_COLLATE needs to be set to LC_COLLATE=C, for example, to get the behavior that everyone is expecting from the posted 'grep' statement. Of course, setting LC_ALL=C would do the trick as well, but it might not really be what you want.
Edit:
Forgot to post link to above quote:
http://www.gnu.org/software/grep/doc/grep_8.html#IDX178
Despite this, I think there is a bug in grep:
$ pacman -Q grep
grep 2.5.3-2
$ echo J | grep --color=always [A-Z]
J
$ echo j | grep --color=always [A-Z]
j
Matched string is supposed to be in color (red in particular) when grep prints matched lines. The printed uppercase J is red as it should be but printed lowercase j is normal terminal color.