Paul Eggert via Bug reports for GNU grep <bug-grep@gnu.org> writes: > $ grep '\Q' /dev/null > grep: warning: stray \ before Q > $ grep '[:alpha:]' /dev/null > grep: character class syntax is [[:space:]], not [:space:]
Is the use of diagnostic warnings like this supported by POSIX? Personally, I'd rather have tools exit with an error code on invalid uses rather than issuing warning messages. /Simon
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