# Command line calculator

calc() { python -c "from math import *; print \$1"; }
This function defines a command line calculator that handles everything pythons math module can handle, e.g. trigonometric functions, sqrt, log, erf, ... (see http://docs.python.org/library/math.html). It even knows about the constants pi and e.
Sample Output
```> calc "sin(pi/3.0)**2"
0.75
> calc "log(e)"
1.0

```

1
2010-10-07 08:26:39

## 5 Alternatives + Submit Alt

• works with fractions like 1/3.5

4
awk "BEGIN{ print \$* }"
· 2010-10-07 16:13:41

• 1
calc() { bc <<< \$*; }
· 2010-10-07 08:44:28
• This opens a python command line. You can use math and random and float-division is enabled (without appending .0 to integers). I just don't know how to specify a standard precision.

1
python -ic "from __future__ import division; from math import *; from random import *"
· 2011-10-24 19:47:27
• use python as calculator, press ctrl+d to exit reminder: when doing factions add atleast one decimal number like so 22.0/7 or 22/7.0 Show Sample Output

0
alias calc='python -ic "from math import *; from random import *"'
· 2011-10-24 08:15:41
• This is an "argument calculator" funktion. The precision is set to 4 and you can use dot (.) or comma (,) as decimal mark (which is great for german users with a comma on the numpad).

-1
calc() { echo "scale=4; \${*//,/.}" | bc -l; }
· 2011-10-24 19:58:20

### What Others Think

`calc 3 +4` 3 it must be print \$*
hemanth · 727 weeks and 1 day ago
Look for the sample output. You can see, that you are supposed to give the arguments in quotes! > calc "3 +4" 7
asmaier · 727 weeks ago
@hemanth: Using \$* does make some calculations easier. But if you're going to do multiplication, you'll need the wrap the whole expression (or the parts with '*' in them) in quotes. Otherwise, bash will expand the star and python will get confused.
aporter · 727 weeks ago

### What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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