xhn@xu-pc:~$ cat file2.txt
Line 1 Line 2
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
xhn@xu-pc:~$ sed
'/^$/d' file2.txt
Line 1 Line 2
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
xhn@xu-pc:~$ gawk
'/./ {print $0}' file2.txt
Line 1 Line 2
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
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