1 2# POSIX and C99 say D800-DFFF are undefined in a universal character name. 3# We reject this but many other shells expand to something that looks like 4# CESU-8. 5 6v=$( (eval ": \$'\uD800'") 2>&1 >/dev/null) 7[ $? -ne 0 ] && [ -n "$v" ] 8