[gentoo-user] OT: bash & decimal/exponential numbers math...

[gentoo-user] OT: bash & decimal/exponential numbers math...

[jarry]

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Hi,

I wrote a short script for simple text file processing in bash
(using "<" for input redirection and "read"). I know, there are
probably better tools to do it, but the only thing I can rely on
being installed on target comp is really bash and nothing more
(no bc, sed, awk, etc.) so I must use only its built-in functions. 

Everything would be OK, if there were only positive integer numbers
in that input file. Unfortunatelly, there are also decimal and
exponential numbers (like 123.456 or 1.23456e+02) which my script
must process. Now I'm pretty deadlocked because too late I realised
that very basic math functions of bash can not handle such numbers.

Now what to do? Are there some functions, which would implement basic
math with real numbers in bash (add, substract, multiply, divide
and round would be enough)?
The idea of writing them myself really scares me...

Jarry

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Re: [gentoo-user] OT: bash & decimal/exponential numbers math...

[Anthony E. Caudel]

jarry@gmx.net wrote:
> Hi,
> 
> I wrote a short script for simple text file processing in bash
> (using "<" for input redirection and "read"). I know, there are

<snip>

> Now what to do? Are there some functions, which would implement basic
> math with real numbers in bash (add, substract, multiply, divide
> and round would be enough)?
> The idea of writing them myself really scares me...
> 
> Jarry
> 

Lots of way to do math from command line.  Check out

bc

dc

even python (echo "print (10E3-123)/123" | python

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