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Extract info and do algebra on it by sed or awk

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Top Forums Shell Programming and Scripting Extract info and do algebra on it by sed or awk
# 8  
Old 02-04-2013
Quote:
Originally Posted by hayreter
That's it. Thanks Don Cragun, changing "A" to "a" worked.
now it works perfect. Smilie
Oops, my bad.

Don, thank you very much for pointing that out.
# 9  
Old 02-04-2013
Bipi,
how could I write this code in a shell script?
# 10  
Old 02-04-2013
By pasting the given code into a file?
# 11  
Old 02-04-2013
there must be a much beautiful and elegant way of doing that.
I am not an expert on AWK or SED, so when I write a script I try
to do it in an explanatory way Smilie so that I can understand what
I am doing Smilie
# 12  
Old 02-04-2013
I will not recommend using shell script here.

If you choose shell script you probably try to do the arithmetic operations using bc, but I doubt if bc supports scientific notation or exponential notation.

So awk is the way to go.
# 13  
Old 02-04-2013
You misunderstood me Bipi Smilie I will use awk for sure, what I asked is to write the very same awk command
in a bash script in a more explanatory fashion. Including for ... if ... statements
# 14  
Old 02-04-2013
The shell is quite capable of reading the required values and matching the correct lines, however, it is only capable of integer arithmetic so you will still need to call awk or bc to do the calculations.

This makes an awk script a much more efficient solution as the shell would be loading and executing an external program for every calculation.
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