# Questions tagged [bc]

Arbitrary-precision arithmetic language.

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1answer
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### Rescaling a scaled value using bc command

I am trying to find square root of 12345 and then scale it to 100 decimal places using the command shown below: val=\$(bc <<< "scale=100 ; sqrt ( 12345) " ) But the problem is I ...
4answers
44 views

### Floating point comparison in shell

I am comparing the floating point values in shell script based on this reference. Following is the script contents num1=50.960 num2=6.65E+07 echo "\${num1} < \${num2}" | bc When I ran the ...
5answers
48 views

### BC scale rounding error

Trying to truncate the value of a bc calculation, however when I set the scale=0 it returns 0 for the entire calculation. Setting scale=1 returns a proper value of 357.3, but scale=0 will always ...
2answers
54 views

### How to pipe a number into bc elegantly?

Is there a more elegant way than using xargs -Ix for the following? echo "283" | xargs -Ix bc -l -e "scale=2; l( x )/l(10)"
20answers
153k views

### Is there a way to get the min, max, median, and average of a list of numbers in a single command?

I have a list of numbers in a file, one per line. How can I get the minimum, maximum, median and average values? I want to use the results in a bash script. Although my immediate situation is for ...
3answers
84 views

### I keep receiving command not found when I try to run my code in bash

I am trying to write a code that will calculate the radius and area of a circle using pi and the circumference. When I try to run my code, I receive an error message that says main.sh: line 5: bc: ...
1answer
27k views

### Does bc support hex calculations?

I'm trying to do a hex calculation directly with bc, I already specified the scale. echo 'scale=16;c06b1000-c06a5e78' | bc But I still get a zero. What could be wrong?
5answers
29k views

### Understand “ibase” and “obase” in case of conversions with bc?

I often use bc utility for converting hex to decimal and vice versa. However, it is always bit trial and error how ibase and obase should be configured. For example here I want to convert hex value C0 ...
4answers
32k views

### Append to a pipe and pass on?

I have a simple bash function dividing two numbers: echo "750/12.5" | bc I'd like to take the output from bc and append /24 and pipe said result to another instance of bc. Something like: echo "...
2answers
492 views

### Is it possible to save `bc` command line history?

bash has a handy file .bash_history in which it saves the history of commands and on the next execution of bash the history is populated with saved commands. Is it possible to save bc command history ...
5answers
51k views

### Float operation with bc?

It looks like bc doesn't support float operations, when I do echo 1/8 | bc it get me a zero. I checked bc (1), but it doesn't even mention float, so I wonder if it's supported?
3answers
353 views

### Add two doubles on bash

I'm trying to add two doubles y1=0.17580197E-01 y2=0.11979236E-02 sum=`echo \$y1+\$y2 | bc -l` the above script gives me sum = -2.704405652. How do i resolve this issue?
1answer
59 views

### How to shorten decimal output in bash?

Right now I am working on an assignment that involves advanced piping, and one of the questions involves calculating a percent and shortening it to 3 decimal places. I've managed to calculate the ...
1answer
104 views

### Set scale for bc inside a variable

I am trying to divide two values in a loop using bc, and I have set that value as a variable. My problem is that I want that value to have 2 decimal places, but I am having trouble getting scale=2 to ...
3answers
25k views

### Bash limiting precision of floating point variables

In Ubuntu 14.04.1 LTS 64-bit bash I am declearing floating point variables by multiplying floating point bash variables in bc with scale set to 3; however, I cannot get the number of digits after the ...
2answers
62 views

### How to properly use bc to convert the value of percentage to floating point format?

I have 3 variables and values: totalLines=14 outsideLines=6 multiplied=600 totalLines represents the total number of lines (100%), while outsideLines represents number of lines with the timestamp ...
10answers
2k views

### How can I evaluate a math equation, one per line in a file?

I have a file with the following: 37 * 60 + 55.52 34 * 60 + 51.75 36 * 60 + 2.88 36 * 60 + 14.94 36 * 60 + 18.82 36 * 60 + 8.37 37 * 60 + 48.71 36 * 60 + 34.17 37 * 60 + 42.52 37 * 60 + 51.55 35 * 60 ...
1answer
94 views

### Why does GNU 'bc' have such a long copyright string?

When you run 'bc' on a GNU system, it prints out the following text: ~\$ bc bc 1.07.1 Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc. This is free ...
4answers
867 views

### How to get bc to print trailing zeros?

I read topics about how to get bc to print the first zero, but that is not exactly what I want. I want more... I want a function that returns floating point numbers with eight decimal digits. I am ...
1answer
637 views

### bc: does POSIX prohibit standalone use of relational operators?

I want to compare two numbers with bc. Per this highly rated answer on StackOverflow, I can do it in a manner as such: printf '%s\n' '1.2 > 0.4' | bc bc sends 1 to STDOUT, indicating that the ...
5answers
4k views

### bc scale: How to avoid rounding? (Calculate small binomial probability)

Following code calculates the Binomial Probability of a success event k out of n trials: n=144 prob=\$(echo "0.0139" | bc) echo -e "Enter no.:" read passedno k=\$passedno nCk2() { num=1 den=...
1answer
111 views

### bc - command: not giving appropriate results

I am trying to do simple calculation using bc command in linux. Once i want the value with all the decimal places. other time i want only the integer part Want to get with full decimal places \$ echo ...
3answers
36 views

### Discard integer and keep floating point

I'm trying to remove an integer from a decimal value that I currently have. current syntax: h=\$(echo "scale=2; ((\$e/\$g/\$g))" | bc) echo \$h The following is used to convert seconds to minutes ...
2answers
41 views

### converting variables in a shell script from strings to numbers

I have a file laid out like this gender,yearsExperience,yearsSchool,wage female,9,13,6.3152956461 female,12,12,5.4797699786 female,11,11,3.6421699174 female,9,14,4.5933365997 female,8,14,2.4181574607 ...
1answer
53 views

### Raise each element of an array to a power and store output to a new array in bash

I want to raise a fraction (fraction is calculated on first loop) to a decimal power (second loop), however, I always get 1 as a result. I want to store the output of the second loop in an array as ...
7answers
4k views

### bash - sum numbers in a variable

I have a variable set with numbers separated with space, of which first number can also be led by space, example: VAR=" 2 1 34 3 2 " I need to sum all these numbers. Easiest way would be ...
0answers
267 views

### Error compiling bc: cannot find libreadline.so.8

I am following the Linux from Scratch book, Version 8.4 and am stuck on compiling bc (Chapter 6.15). I have copied and pasted the commands on that page up to the make command, but when I run make, I ...
4answers
4k views

### how to make bc to show me 10 and not 10.00

#!/bin/bash q=\$(bc <<< "scale=2;\$p*100") head -n\$q numbers.txt > secondcoordinate.txt That's just part of the script, but I think it's enough to clarify my intentions. p is a variable ...
4answers
27k views

### How is bc different from dc?

What are the differences between dc and bc calculators? When should I use dc and when bc?
1answer
3k views

### Convert serialized Java object to human readable

I have object of class class X { private DateTime dt; "constructor, set/get" } I have one instance of this object serialized in file.bin. I want to show content of `file.bin on the Linux ...
0answers
27 views

### bc command unexpected results [duplicate]

I am trying to compare a decimal and it seems like bc is ignoring it. The OS is CentOS release 6.9 (Final) and bash is bash-4.1.2-48.el6.x86_64, below is the code #!/bin/sh i=32.39 IP_LOW_2=32.0 ...
1answer
642 views

### How display the output of calculation in decimal point using bc command

I want to do simple coding by storing the output calculation in variable and display the result in decimal point using command bc. But it only works on for minus calculation not for division ...
2answers
1k views

### How to store the output of calculation to variable using bash script [duplicate]

I want to do a simple coding by storing the product of calculation using command bc into variable. answer="\$varnameX % \$num1" | bc echo "the result is \$answer" it did not show the product of ...
4answers
77k views

### Calculate variable, and output it to another variable

The only calculator I know is bc. I want to add 1 to a variable, and output to another variable. I got the nextnum variable from counting string in a file: nextnum=`grep -o stringtocount file.tpl....
1answer
329 views

### Bash Script Wind Chill using getopt and bc

I am now getting the correct output, however it is not scaling to only 3 places. Anyone know how to do that? function windchill { to=32 v=10 vel=`echo 'e(l('\$v')*0.16)' | bc -l` w=\$(...
2answers
321 views

### How to avoid wrapping in bc output

I have the following example in GNU v. 1.06 (I cannot identify a limit pertaining to line length): v=\$(bc -l <<<"scale=100;4*a(1)"); echo \$v which returns: 3....
3answers
3k views

### BC - no “\\n” at the end + start with zeros?

This is a bc output, e.g.: Input: echo "scale=10; BLA-BLA-HERE-NOT-IMPORTANT" | bc Output: .3708446283953709207058828124021300754352578903651372655882743141882\ ...
0answers
187 views

### Convert to Single line output of bc command [duplicate]

echo 'obase=2; 3402823669209384469321375 ' | bc 10110100001001001101110000110101000010010101110011010101100110001011\ 01011010011111 I would like to convert the multiple line output into a single ...
1answer
245 views

### Calculate difference in negative floating numbers with bc

I want to calculate the difference between two negative floating numbers and subsequently check if the result is below a certain threshold. The numbers are stored in the file.dat, since this ...
1answer
4k views

### (standard_in) 1: syntax error when using bc

I have written an .awk which executes some operation on a .tr file and writes the output to a file. The END section of .awk file prints this: printf("%15.2f\n%15.5f\n%15.2f\n%15.2f\n%15.2f\n%10.2f\n%...
3answers
39k views

### How to format floating point number with exactly 2 significant digits in bash?

I want to print the floating point number with exactly two significant digits in bash (maybe using a common tool like awk, bc, dc, perl etc.). Examples: 76543 should be printed as 76000 0.0076543 ...
2answers
155 views

### What is the numeral for base greater than 16 in bc?

I recently read about bc and found that it supports obase upto 999. Can anyone point me to the numeral set for bc for base greater than 16.
1answer
788 views

### GNU BC: How is the “modulo” (%) with scale other than 0 useful?

This is a self-answered question, the research that is reasonable to ask for a question goes in the answer part, Please do not downvote because you believe I have not researched enough for an answer. ...
3answers
675 views

### compare two IP address using bc

I am trying to compare two IP address using bc command however the IP with lower numeric value is not being trapped in the test. Here is my code: TEST=\$(echo "\$i < \$IP_BRD && \$i > \$...
1answer
89 views

### AIX Does not support bc boolean expression [duplicate]

I ran into an issue where bc does not have boolean expressions in the AIX system. Wondering if there is a replacement command so I don't have make my code any longer? This is in a bash script. Here ...
1answer
2k views

### bc: Why does `ibase=16; obase=10; FF` returns FF and not 255? [duplicate]

I've been using bc to convert numbers between binary to hex, octal to decimal and others. In the following example, I was trying to convert base 16 (hex) number to binary, octal and decimal. I don't ...
1answer
68 views

### How change first rows in column format of next's rows, replacing * by a number and perform operations between columns?

I have the following file which has the first two rows as if they were a single-column (i.e. a continuous string). I would like to separate them into columns and replace the "*" character with an "x" ...
1answer
74 views

### how to close a while statement in bc script

I cannot find a way to close while statement.The following is my bash script code. bc << EOF a=0; while(a<10) a++; print a; EOF The ouput is not as expected, it prints all the a values ...
2answers
234 views

### Syntax error when i use ssh with awk over bc

I basically get the memory usage from two different nodes via ssh and store this in two different variables. I then select the host with lesser memory and return a code 0 or 1. The array arr contains ...
1answer
1k views

### How to script an an exponential function that decrements the value of the exponent every iteration so that the exponent does not grow?

New to Linux and having problems getting this script to run. Been working on something to take large numbers and use the remainder (modulus) to store the result ( to save memory ). Using the bash ...