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$ strace perl -e'$|=0; print for "a", "b\n", "c\n"' >/dev/tty
write(1, "ab\n", 3)                     = 3
...
write(1, "a", 1)                        = 1
write(1, "b\n", 2)                      = 2
write(1, "c\n", 2)                      = 2