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Need help is manipulating a file with some arithmetic operations using bash script

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# 1  
Old 07-03-2009
Need help is manipulating a file with some arithmetic operations using bash script
Friends,
I have a file with contents like:

interface Serial0/4/0/0/1/1/1/1:0
encapsulation mfr
multilink
group 101

Now I need to manipulate the file in such a way that to all the numbers less than 163, 63 gets added and to all numbers greater than 163, 63 gets deducted.(The numbers means the numericals after "group") How do I do this using a bash/shell script?

Thanks
Shrijit
# 2  
Old 07-03-2009
hope this will work.. (I couldn't test it)
Code:
awk '{if($0 ~ /^group/){if($2>163){printf "group %d\n",$2-63}else{printf "group %d\n",$2+63}}else{print}}' filename

# 3  
Old 07-03-2009
Code:
nawk '$1=="group" {$NF+=($NF<163)?63:-63}1' myFile

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