Hi, Sort is seriously bugged. This is the output from: sort -d -t \t -k1 input > out 0009rN2S3cohd2DGH6yuTWBoeuq6DwWZhCBDEnFzYqpw984FfALy7NUhEZH1.YEbiq/ 000EMQeKUjtyXIOaUkT.XE6SaBIdOqTA0nffF394V6tkcVdup2c3ihi7yhbuRof2Y5agTG 000p8kXIz5Tc1GaxYYXjAfgm7YJOZvyBJxVXMi0lhaJXT22IdDbE6vVhWXW9FkRBxQ 00/0QwzaXrqGHXW7mE9Le8IIVgHoZvccgGydKdzJgh8.SZenbULmIWMtrGShz24W7T 000R2cnZ8.khe1eXDERclkbXASRQeKvcNBaCJRLX617Xvmff0KaoZSSFBNhNG1OiIyr Shouldn't 00/0 be first according to Ascii code? Plz fix. TIA, Nikos