What characters are valid in a here doc tag?cat << 'what_characters_can_be_used_here'what_characters_can_be_used_hereI ask, because I want a string that is very unlikely. Thus, I want to include odd characters in the string. I use bash, and can use bash specific features, but it is interesting to know general POSIX limitations too. Also it is interesting to know the maximum safe length for the delimiter string.
Valid characters in here doc tag
shell script;here document