<izabera> ` printf \'FNR == 1{ for (i = max; i >= 1; i--) print a[i] } { a[max=FNR] = $0 } END { for (i = max; i >= 1; i--) print a[i] }\' > bin/tac; chmod +x bin/tac

#!/usr/bin/python
import sys
import chardet
x = sys.stdin.read()
enc = chardet.detect(x)['encoding']
sys.stdout.write(x.decode(enc).encode('UTF-8'))