Bash Floor Bc

I have tried several methods.

Bash floor bc.

The most common one is bc an arbitrary precision calculator language. The l option changes the scale to 20 so things such as modulo may work unexpectedly. Increment operators there are 2 kinds of increment operators. Variable is increased first and then result of variable is.

Plan 9 bc is identical to posix bc but for an additional print statement. How do i use bash to add all the floating point numbers saved in a file like this. Ilkkachu oct 13 19 at 16 01. Among them printf is quite fast.

On my awks the latter one rounds towards zero not to minus infinity as floor can be taken to mean. For example writing bc l and then the command print 3 2 outputs 0. Bc l 2 6 5 2 40000000000000000000 let s look at how to use bc non interactively this is also useful for shell scripting purposes. I m not sure if that s any different from what bash s printf does or if there s any other reason to prefer awk over the builtin printf.

Gnu bc derives from the posix standard and includes many enhancements. But writing scale 0 after bc l and then the command print 3 2 will output 1. Bash only evaluates expressions with non floating point numbers. Post increment operator result of the variable is used first and then variable is incremented.

Using the bc command line. External commands like bc or awk or perl can be used to round numbers as needed. 490 47 244 61 263 07 131 59 246 81 115 20 3 replies discussion started by. Pre increment operator variable is increased first and then result of variable is stored.

So there is no built in function for rounding up or down floating point numbers. Echo var 10 var bc output. Ex floor 2 9 2 floor 2 1 2 floor 2 0 2 floor 2 0 2 floor 2 1 3 floor 2 9. Also the first rounds halves to even numbers.

You can also use the following command for common shells for instance in bash ksh csh to pass arguments to bc as shown. Since you can t do floating point arithmetic natively in bash you will have to use a command line tool.