Linux BC command-line Calculator

1. Basic usage:

$ BC <<< 5*420$ BC <<< 5+49$ BC <<< 5-41

Or

$ echo "5*4" | bc20$ echo "5+4" | bc9$ echo "5-4" | Bc1

You can also write a calculation to a file and then calculate it once.

$ cat calcfile 5+56+7$ BC < calcfile 1013

You can also use the here Command:

$ BC << here> 1+4> 4-1> 2*4> HERE538

You can use the built-in variable last to refer to the previous result:

$ echo "5-4;last+6" | Bc17

Last can also be replaced with dot number:

$ echo "5-4;. +6 "| Bc17

2. Floating-point arithmetic:

You can use scale to specify the number of digits after the decimal point (the default is 0, which is an integer)

$ echo "sqrt (10)" | bc3$ echo "scale=1;sqrt (10)" | bc3.1$ echo "scale=10;sqrt (10)" | bc3.1622776601

Sometimes you don't get the number of digits you specify:

$ echo "SCALE=10; 1.25*9 "| bc11.25

At this point, you can modify it to:

$ echo "SCALE=10; 1.25*9/1 "| bc11.2500000000

3. The conversion of the numeral:

You can use variable IBase to represent the number of numbers before conversion, and obase to represent the number of converted Numbers

$ Echo ' obase=16;128 ' | Bc80

$ Echo ' ibase=16;obase=a;80 ' | bc128

$ Echo ' obase=2;128 ' | bc10000000

$ Echo ' ibase=2;obase=a;10000000 ' | bc128

$ echo "obase=10;ibase=16;80" | bc128

4. Exponential operation:

$ echo "5^5" | bc3125

$ echo "(5^5) ^5" | bc298023223876953125

Remember that the result of the first exponential operation is to add parentheses.

5. Function library-based operations

BC supports the following functions:

s (x): sine function (x is radians)

C (x): cosine function (x is radians)

A (x): Inverse tangent function (the result is radians)

l (x): Natural logarithm function

E (x): exponential function with E as the base

J (n,x): Bessel function

At this point, the BC is added with the-l parameter (at this point, the scale is 20)

Calculate log1.5 (2) (base 1.5, 2 logarithm):

$ echo "L (2)/L (1.5)" | bc-l1.70951129135145477699

You can also use the awk command:

$ Awk ' BEGIN {printf '%1l.9f\n ', log (2)/log (1.5)} ' 1.709511291

6. Script Function Programming:

$ cat Calc_prog print "Enter a number a\n"; A = read () print "Enter another number b\n"; b = Read () if (b = = a) {print "b = a\n";} if (a < b) {print "B > a\n";} if (a > B) {print "B < a\n";}

$ bc-l Calc_prog

7. Script Simulation Calculator:

$ cat calc.sh #!/bin/bashbc << endscale=2[email protected]end

$./test.sh  1+23

Reference:

http://mylinuxbook.com/linux-command-line-calculator-bc-examples/

Linux BC command-line Calculator