On 16 Jul 2019, at 21:09, Daniel Janus wrote:
Clearly, Busybox's `tr` doesn't support the `[:graph:]` character
class. Instead, it's taking those 9 characters (8 distinct) as a
character set.
This gave me a chuckle :)
Given that Busybox's focus is on size and essential features, and
character classes are arguably not essential, I doubt whether this
will be changed upstream.
I checked the source¹ and they have two commented constants:
`CLASS_graph` and `CLASS_print`.
I think that it’s just that nobody got around to adding support for
these. It would hardly increase the size.
Btw: Since they support both `alnum` and `punct`, I think you can use
this:
read -r -n 12 pass < <(LC_ALL=C tr -dc '[:punct:][:alnum:]' <
/dev/urandom); echo $pass
Maybe submit a PR and see what Jason says.
But I think it would be better to submit a PR toward BusyBox’s `tr`
implementation.
¹ https://git.busybox.net/busybox/tree/coreutils/tr.c
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