Grep command Post: 302994246

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Top Forums Shell Programming and Scripting Grep command Post 302994246 by Theo Score on Monday 20th of March 2017 11:56:56 PM

03-21-2017

Registered User

Grep command

Hi All,

I have a directory of simulation data files with structure dump*.data and an example of such data file is given below.

Code:

ITEM: TIMESTEP
10000
ITEM: NUMBER OF ATOMS
6
ITEM: BOX BOUNDS ff ff ff
-0.15 0.15
0 0.5
-0.15 0.15
ITEM: ATOMS id type x y z vx vy vz fx fy fz omegax omegay omegaz radius c_nconts 
1 1 -0.0506691 0.371195 -0.0540098 0 -1 -0 0 0 0 0 0 0 0.03 0 
4 2 -0.0400495 0.270148 0.0120722 0 -1.25925 0 0 -0.345173 0 0 0 0 0.02 0 
2 1 -0.0102719 0.415304 0.0113916 0 -1 -0 0 0 0 0 0 0 0.01 0 
6 2 0.0192567 0.33773 0.0256545 0 -1 -0 0 0 0 0 0 0 0.01 0 
3 1 0.0371105 0.373507 -0.00483919 0 -1 -0 0 0 0 0 0 0 0.02 0 
5 2 0.0426929 0.366908 0.057645 0 -1 -0 0 0 0 0 0 0 0.03 0

I have made up the script below which filters specific number in the first column and read thorough in all the data files

Code:

grep -h "^$1 " dump[1-9]????.data > particle$1.dat 
grep -h "^$1 " dump[1-9]?????.data >> particle$1.dat
grep -h "^$1 " dump[1-9]??????.data >> particle$1.dat

Now I want the code to read first the second row (10000 in this case) and append it as the first column of the results of the current code. Row 2 in the data files have values of 10000, 20000, 30000,...1790000,1800000. For example, if I read for row which starts with 4, I want the output to be

Code:

10000 4 2 -0.0400495 0.270148 0.0120722 0 -1.25925 0 0 -0.345173 0 0 0 0 0.02 0

Thank you.

Last edited by Theo Score; 03-21-2017 at 01:02 AM..

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