Works for me:
Code:
$ cat test.dat
line 1 of test data
line 2 of test data
line 3 of test data
line 4 of test data
$ sed '1d' test.dat
line 2 of test data
line 3 of test data
line 4 of test data
Can you post your data file? It would be best if you could upload it somewhere without modifications, rather than copy-pasting parts of it. I am thinking you might have some strange embedded characters in the file which might account of the problem.