...to do this:
$ echo 'hello world-1' | tr -d '[ -]'
that is, remove all SPACES (0x20) and dashes (0x2D) in input? I get
mixed results with both various versions of busybox but also with the
coreutils `tr' and the characters order placed in the character class.
`man 7 regex' is telling us:
To include a literal '-', make it the first or last
character, or the second end-point of a range.
To use a literal '-' as the first endpoint of a range, enclose
it in "[." and ".]" to make it a collating element (see
below). To use a literal '-' as the first endpoint of a
range, enclose it in "[." and ".]" to make it a
collating element (see below). With the exception of these
and some combinations using '[' (see next paragraphs), all
other special characters, including '\', lose their special
significance within a bracket expression.
and so on.
So, I could list a few unintuitive character classes that would
produce unintuitive results, with both coreutils `tr' and busybox
`tr'. What is the correct incantation that would always work as
expected?
Cheers,
--
Cristian
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