Login or Register to Ask a Question and Join Our Community


Fedora

Simple arithmetic in shell

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems Linux Fedora Simple arithmetic in shell
# 8  
Old 05-22-2009
It says non-numeric argument when I try to execute it
# 9  
Old 05-22-2009
What did you try to execute?
Code:
$ echo "(120/220)*100" | bc
54.54545454545454545400
$ VAR=$( echo "(120/220)*100" | bc )
$ echo $VAR
54.54545454545454545400
$ div1=120
$ div2=220
$ VAR=$( echo "($div1/$div2)*100" | bc )
$ echo $VAR
54.54545454545454545400

# 10  
Old 05-22-2009
the best is to use awk for any kind of mathematical operation
Code:
awk 'BEGIN{print 100/10}'
awk 'BEGIN{print (10/100)*12}' etc etc....

# 11  
Old 05-22-2009
Quote:
Originally Posted by pludi
What did you try to execute?
Code:
$ echo "(120/220)*100" | bc
54.54545454545454545400
$ VAR=$( echo "(120/220)*100" | bc )
$ echo $VAR
54.54545454545454545400
$ div1=120
$ div2=220
$ VAR=$( echo "($div1/$div2)*100" | bc )
$ echo $VAR
54.54545454545454545400

I used the fast one which is
Code:
$ echo "(120/220)*100" | bc

but it didn't work. Says command not found.
# 12  
Old 05-22-2009
Then you don't have bc installed. Try the awk approach as suggested by vidyadhar (you can pass variables to awk with the -v switch) or install bc.
# 13  
Old 05-22-2009
How can I install bc then? From the terminal, maybe there is a simple way to do it?
# 14  
Old 05-22-2009
Which OS? In Linux it's one of
  • apt-get install bc #Debian & derivates
  • zypper install bc #OpenSuSE / SLES
  • yum install bc #Red Hat / Fedora / CentOS
  • emerge bc #Gentoo
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Shell arithmetic : operations on decimal points

i am having a varialbe a , which is input to my file i want to multiply this input with value .43, and assign it to variable b. i tried it as below: #!/bin/sh a=$1 b=`expr $1\*0.43` echo b=$b error : expr: non-integer argument Please tell me , how to do this. Thanks (10 Replies)
Discussion started by: rishifrnds
10 Replies

2. Shell Programming and Scripting

Help with Arithmetic calculations in Shell script

Hi, I need a help with arithmetic calculations in my script. I have two variables: a=17; b=1712 I want to perform ($a/$b)*100 with two decimals in the result. I tried with following: res=$((100*a/b)) res=`echo "scale=2; $a / $b" | bc` But I am not getting the decimal values.... (4 Replies)
Discussion started by: karumudi7
4 Replies

3. Shell Programming and Scripting

how to do decimal arithmetic in shell script

hi, I have a file with decimal/non-decimal values $ cat b22 373 164 92 62 20 131 94 12 129 111 95 154 37 15 447 25 7.4 135 77 122 32 92 70 57 37 42 72 17 13 97 40 41 53 22 80 71 29 87 23 31 273 6.2 12K 43 44 45 22 11 7.7 13 18 173 36 20 18 13 56 67 104 53 5.4 241 19 13 3.8 38 14 31 329 16 155... (8 Replies)
Discussion started by: sam05121988
8 Replies

4. Shell Programming and Scripting

shell arithmetic least significant place

I need help on arithmetic root@server # hour=`date | awk {'print $4'} | cut -d: -f 1`; echo $hour 04 Now I subtract this result by 1 or 01 I get "3" as the answer. I need "03" as the answer, ie last two significant numbers should be there. root@server # hour=`date | awk {'print $4'} | cut... (3 Replies)
Discussion started by: anilcliff
3 Replies

5. Homework & Coursework Questions

Arithmetic Problem with shell script programming.

Hello everybody, I decided to take a Unix Introduction class and have never had experience with programming. Everything was fine until recently when the Prof. started shell scripting and he wants us to make a small script to add unlimited numbers from arguments and from standard input. I... (8 Replies)
Discussion started by: Florinel76
8 Replies

6. Shell Programming and Scripting

Arithmetic Problem with shell script programming.

Hello everybody, I decided to take a Unix Introduction class and have never had experience with programming. Everything was fine until recently when the Prof. started shell scripting and he wants us to make a small script to add unlimited numbers from arguments and from standard input. I... (1 Reply)
Discussion started by: Florinel76
1 Replies

7. Post Here to Contact Site Administrators and Moderators

Broken link FAQ date arithmetic with shell

page unix com/answers-frequently-asked-questions/13785-yesterdays-date-date-arithmetic.html Date Arithmetic with the Shell has link of www samag com/documents/s=8284/sam0307b/0307b.htm which is no longer. Is this the correct place to post this?:confused: and I got message... (1 Reply)
Discussion started by: dgerman
1 Replies

8. Shell Programming and Scripting

Arithmetic calculation on real numbers in Bourne Shell Script

I am begining to learn bourne shell and as a practice I have written a script which when given the purchase price and percentage of discount calculates the savings. I somehow cannot figure out why my script fails to do arthimatic calculation on real numbers. Could anyone look at the script... (5 Replies)
Discussion started by: Tirmazi
5 Replies

9. Shell Programming and Scripting

simple shell - how to get a parameter typed in a shell script

Hi, I am new to unix and using linux 7.2. I would like to create a script that would make it easyer for me to run my java programms. At the moment I have to type java myJavaprogram I am trying to write a script that will allow me to type something like this "myscript myJavaprogram" or maybe... (4 Replies)
Discussion started by: cmitulescu
4 Replies

10. Shell Programming and Scripting

Simple arithmetic operation

I have no idea why I can't get this to work, if anybody can help i would appreciate it. #!/bin/bash x=`cat counter.txt | wc -l` y= '$x / 7' printf "%d People have visited this page" $y :confused: (2 Replies)
Discussion started by: paladyn_2002
2 Replies
Login or Register to Ask a Question