Extracting a specific column from a text file using unix

Hi,

I have a unix file which looks like the following.

1. From this file I want to extract out the column labelled Safety
Factor and I want to write it to an external file.
2. This set of data keeps on repeating and I want to keep on appending
each instance of its occurence to the same external file.
Please help me in this regard.


Regards

Jolly
* MAXIMUM LINE TENSIONS. LF AND HF MOTION *
------------------------------------------------

** Line Dynamics Included **

Line ---- Top tension ---- Max.
Direction Type
No. Mean Max Safety Segm. tangent from hor.
(kN) (kN) factor No. motion (m)
plane (deg)

1 2687.3 4538.5 4.07 3 12.06
-60.6 SAM
2 2729.6 4578.2 4.03 3 12.25
-60.6 SAM
3 2776.7 4623.1 3.99 3 12.47
-60.5 SAM
4 2828.6 4666.1 3.95 3 12.74
-60.5 SAM
5 2885.4 4710.7 3.92 3 13.05
-60.5 SAM
6 5704.8 14472.9 1.28 3 19.04
-44.3 SAM
7 5756.4 14627.2 1.26 3 19.12
-44.2 SAM
8 5773.8 14678.8 1.26 3 19.15
-44.2 SAM
9 5756.4 14627.2 1.26 3 19.12
-44.2 SAM
10 5704.8 14473.3 1.28 3 19.04
-44.3 SAM
11 2885.4 4710.5 3.92 3 13.06
-60.5 SAM
12 2828.6 4665.1 3.96 3 12.74
-60.5 SAM
13 2776.7 4620.9 3.99 3 12.47
-60.5 SAM
14 2729.6 4577.6 4.03 3 12.25
-60.6 SAM
15 2687.3 4535.8 4.07 3 12.06
-60.6 SAM

SAM = Tensions are estimated with the Simplified Analytic Method
HF max tension: Non-Rayleigh based
LF max offset : Non-Rayleigh based

MIMOSA Version 5.7-03 05-JUN-2008 12:58
MARINTEK
Page
8
100 yr wave




Details on dynamic tension (in kN):
-------------------------------------------------------
Line Standard Maximum Maximum Zero crossing
No. deviation amplitude tension period (s)
-------------------------------------------------------
1 396.5 1428.5 4538.5 15.58
2 405.1 1461.9 4578.2 15.53
3 415.4 1501.1 4623.1 15.49
4 425.6 1539.0 4666.1 15.45
5 436.8 1580.2 4710.7 15.40
6 646.0 2341.6 14472.9 15.15
7 648.8 2351.6 14627.2 15.15
8 649.7 2355.0 14678.8 15.15
9 648.8 2351.6 14627.2 15.15
10 646.0 2341.6 14473.3 15.15
11 436.9 1580.3 4710.5 15.40
12 425.4 1538.2 4665.1 15.44
13 414.9 1498.9 4620.9 15.49
14 405.1 1461.8 4577.6 15.53
15 395.8 1425.8 4535.8 15.57
.

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