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

shrijith1 · #1 (**permalink**) 07-03-2009

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

vidyadhar85 · #2 (**permalink**) 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

vgersh99 · #3 (**permalink**) 07-03-2009

Code:

nawk '$1=="group" {$NF+=($NF<163)?63:-63}1' myFile

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