INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# divide in bash to 1 decimal place

## divide in bash to 1 decimal place

(OP)
hello,

on a system having no bc, perl, awk, and to which I have no administrator rights (only common user account), with restricted shell (bash), sed and expr available, I need to be able divide numbers to 1 decimal place:

> echo $((10/10)) 1 > echo$((5/10))
0

I'd like to get 1.0, 0.1, etc (so leading zero for <1)

also builtin let gives 0
> let "m=1/4";echo $m 0 thanks in advance for a hint! ### RE: divide in bash to 1 decimal place bash doesn't have floating point maths built in, so without 'bc' and it's associated scale=n, decimal places simply are not going to happen. try expr 4 / 3 and see what the result is. Chris. Indifference will be the downfall of mankind, but who cares? Time flies like an arrow, however, fruit flies like a banana. Webmaster Forum ### RE: divide in bash to 1 decimal place (OP) so it looks there is no local solution on this host... > expr 4 / 3 1 > expr 1 / 3 0 ### RE: divide in bash to 1 decimal place Hi If you want to keep your script pure Bash, you can do a trick by multiplying the dividend enough so integer arithmetics give precise enough result, then add separate the fractional part with string operation : #### CODE --> Bash m=$(( 4 * 10 / 3 ))
echo "${m:0:-1}.${m: -1}" 

But better use tool instead. Either the already mentioned Bc with its verbose syntax, or Dc :

#### CODE --> command line

master # bc <<< 'scale=1;4/3'
1.3

master # dc <<< '1k4 3/p'
1.3 

Feherke.
feherke.ga

### RE: divide in bash to 1 decimal place

If it's for scale 1 why not simply multiply the numerator by 10 and use string manipuation to insert the point.
Maybe something like this (rough draft):

#### CODE

#!/bin/bash

X=3
Y=4

X10=$(($X*10))

R=$(($X10/$Y)) [$(($X/$Y)) -ge 1 ] && RD=${R:0:${#R}-1}.${R:${#R}-1} || RD=0.$R echo$RD 
Just keep in mind that your result is a string...

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Close Box

# Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!