multiple action!

Shell Programming and Scripting
1

lets explain it easy by showing the initial file and desired file:
I've a file such this that contains:
initial_file:

31/12/2011 23:46:08    38.6762    43.689    14.16    Ml 3.1     
                                                                                                                 
TypeID    GroupID    EventID    BulletinID    CodeID    Station    Component    Phase    Quality    Day    Month    Year    Hour    Minute    Second    Residual    Polarity    Hypo    Weight    Duration    Amplitude Type    Amplitude    Period    Md    Ml    Mb    Ms    Mw    Distance    Azimuth 
1    0    2.01112E+13    1325375174    52    TVAN    Z    P    I    31    12    2011    23    46    13.8469    -0.27    0    1    0    0    C    25253.24    0.18    0    3.4    0    0    0    30.01    235.7882 
1    0    2.01112E+13    1325375174    290    VMUR    Z    P    I    31    12    2011    23    46    13.9996    -1.99    0    1    0    0    C    3182.026    0.13    0    3.2    0    0    0    36.28    343.7596 
1    0    2.01112E+13    1325375178    331    CLDR    Z    P    I    31    12    2011    23    46    17.9258    -0.27    0    1

desired_file:

31/12/2011 23:46:08 38.6762 43.689 14.16 Ml 3.1     
1    0    2.01112E+13    1325375174    52    TVAN    Z    P    I    31    12    2011    23    46    13.8469    -0.27    0    1    0    0    C    25253.24    0.18    0    3.4    0    0    0    30.01    235.7882 
1    0    2.01112E+13    1325375174    290    VMUR    Z    P    I    31    12    2011    23    46    13.9996    -1.99    0    1    0    0    C    3182.026    0.13    0    3.2    0    0    0    36.28    343.7596 
1    0    2.01112E+13    1325375178    331    CLDR    Z    P    I    31    12    2011    23    46    17.9258    -0.27    0    1       0
2

So you want to remove the second and third lines?

sed '2,3d' < input > output
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