On Thu, Mar 28, 2019 at 09:30:43PM +0100, Norman H. Azadian wrote:
> Description:
> In version 4 [A-Z] is broken and [:upper:] works.
> In version 5, the situation is reversed.
>
> Repeat-By:
> foo=ABC ; echo ${foo%[A-Z]} ${foo%[:upper:]}
You have two problems here. Well, four really.
First, your first example invokes platform-defined behavior. [A-Z]
isn't safe to use unless one of the criteria described below are met:
[...] Matches any one of the enclosed characters. A pair of
characters separated by a hyphen denotes a range expres‐
sion; any character that falls between those two charac‐
ters, inclusive, using the current locale's collating
sequence and character set, is matched. If the first
character following the [ is a ! or a ^ then any charac‐
ter not enclosed is matched. The sorting order of char‐
acters in range expressions is determined by the current
locale and the values of the LC_COLLATE or LC_ALL shell
variables, if set. To obtain the traditional interpreta‐
tion of range expressions, where [a-d] is equivalent to
[abcd], set value of the LC_ALL shell variable to C, or
enable the globasciiranges shell option. A - may be
matched by including it as the first or last character in
the set. A ] may be matched by including it as the first
character in the set.
Second, your second example should be using [[:upper:]] not [:upper:].
You might be mixing up tr's syntax with glob/regex syntax.
Also, you didn't tell us what result you got, or what result you
expected to see. And you forgot to quote.
wooledg:~$ var=ABC; echo "${var%[[:upper:]]}"
AB
wooledg:~$ LC_COLLATE=C; var=ABC; echo "${var%[A-Z]}"
AB
wooledg:~$ unset LC_COLLATE; shopt -s globasciiranges; var=ABC; echo
"${var%[A-Z]}"
AB
