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lang-bash
/and the/ERE/operator, and the special case of()being optional forlength(still those implementations are not POSIX compliant in that case). Usinglength()orlength($0)here instead oflengthwould help for those. You could also doawk 'BEGIN{half = int(length(ARGV[1]) / 2); print substr(ARGV[1], 1, half) ORS substr(ARGV[1], half+1)}' abcdefwhich would save the pipe and extra process and make it work even if the string contains newline characters.