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awk script to renumber

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# 1  
Old 05-07-2014
awk script to renumber
I have input file like

MODEL 1
ATOM 1 N GLY 121 27.310 57.180 59.640 1.00 0.00
ATOM 2 H1 GLY 121 27.320 57.560 60.610 1.00 0.00


MODEL 2
ATOM 1 N GLY 121 28.430 56.080 59.750 1.00 0.00
ATOM 2 H1 GLY 121 27.710 56.330 59.050 1.00 0.00
MODEL 3
ATOM 1 N GLY 121 26.830 56.110 61.050 1.00 0.00
ATOM 2 H1 GLY 121 25.880 56.520 61.170 1.00 0.00

-------------

desired output

just change in number related to MODEL

MODEL 50
ATOM 1 N GLY 121 27.310 57.180 59.640 1.00 0.00
ATOM 2 H1 GLY 121 27.320 57.560 60.610 1.00 0.00


MODEL 51
ATOM 1 N GLY 121 28.430 56.080 59.750 1.00 0.00
ATOM 2 H1 GLY 121 27.710 56.330 59.050 1.00 0.00
MODEL 52
ATOM 1 N GLY 121 26.830 56.110 61.050 1.00 0.00
ATOM 2 H1 GLY 121 25.880 56.520 61.170 1.00 0.00

thanks
# 2  
Old 05-07-2014
without knowing more details for 'renumbering':
Code:
awk -v d=49 '$1=="MODEL" {$2+=d}1' myFile

# 3  
Old 05-07-2014
Thank you,

It solved my problem.
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