Jochen Spieker:
> Morel Bérenger:
> > $man dc
> > => "reverse-polish" ? What is it? It is surely not for simple
> > calculations and conversions...
> 
> That's probably only for majors in maths or computer science.

No, dc is a perfect tool for simple calculations and conversions.

Instead of entering e.g. 2+3= you use the so-called reverse-polish
notation: 2 3+
Once used to it, you'll probably never want anything else.

Imagine a stack:

0
0
0
0

After entering 2, it looks like this:

0
0
0
2

After entering 3:

0
0
2
3

After entering +:

0
0
0
5

In dc:

$ dc
2 3+p
5

As a final example, the calculation of (1 + V5)/2
(V means square root here) up to 6 decimal places:

$ dc
6k1 5v+2/p
1.618033


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