On Tue, 29 Aug 2017 19:23:39 +0200 (CEST)
Cristian Ionescu-Idbohrn <[email protected]> wrote:
> ...to do this:
>
> $ echo 'hello world-1' | tr -d '[ -]'
>
> that is, remove all SPACES (0x20) and dashes (0x2D) in input? I get
echo 'hello world-1' | tr -d -- ' -'
> 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:
SETs in tr(1) aren't actually regex, so this doesn't apply. As shown
above, simply list the characters you wanna delete.
`man tr` tells us:
SETs are specified as strings of characters. Most
represent themselves.
HTH,
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