On 17 Jul 2019, at 13:07, Jason A. Donenfeld wrote:
- graph == punct|alnum ? or is it missing things?
Having a hard time finding the POSIX definition, but GNU grep explicitly
says that `[:graph:]` is equivalent to `[:alnum:]` plus `[:punct:]`:
https://www.gnu.org/software/grep/manual/html_node/Character-Classes-and-Bracket-Expressions.html
Using `man ispunct` and `man isgraph` on macOS indicates that
`[:print:]` is `[:graph:]` minus `[:alnum:]`.
A quick test confirms this:
% for ch in {0..127}; do printf "\\x$(printf '%02x' $ch)"; done|tr -cd
'[:alnum:][:punct:]'; echo
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
% for ch in {0..127}; do printf "\\x$(printf '%02x' $ch)"; done|tr -cd
'[:graph:]'; echo
!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
- There was some mention in the thread about toybox having issues with
those?
The `tr.c` included with BusyBox says it comes from Minix, so presumably
everything borrowing from Minix would have the same issue.
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