tags 30681 notabug stop On Fri, Mar 2, 2018 at 2:32 PM, Paul Eggert <egg...@cs.ucla.edu> wrote: > On 03/02/2018 09:23 AM, Peng Yu wrote: >> >> Where is this info documented for grep? > > It's not documented for grep because it's not part of grep. It's part of > your locale.
You can check for yourself. In every one of the 818 locales installed on a Fedora 27 system, I see the same five bytes: $ perl -e 'print pack ("C*", 0..255);'|grep -ao '[[:space:]]'|tr -d '\n' |od -ac -An ht vt ff cr sp \t \v \f \r