Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Comparing decimal numbers between 0 and 1

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Comparing decimal numbers between 0 and 1
# 1  
Old 05-18-2012
Comparing decimal numbers between 0 and 1
For numbers between 0 and 1 the below logic is not working.
Output of above shall be "correct" but its echoing "incorrect".Kindly suggest

Code:
a=.1
if [ $a -gt .01 ] 
then 
echo correct
else echo incorrect
fi

Moderator's Comments:
Mod Comment Video tutorial on how to use code tags in The UNIX and Linux Forums.
# 2  
Old 05-18-2012
Use a shell that supports floating point arithmetic (ksh93, zsh) or use some other tool (awk, Perl ...).

Code:
zsh-4.3.14[sysadmin]% ksh93 -c '(( .1 > 0 )) && print ok'
ok
zsh-4.3.14[sysadmin]% zsh -c '(( .1 > 0 )) && print ok'
ok
zsh-4.3.14[sysadmin]% bash -c '(( .1 > 0 )) && echo ok'
bash: ((: .1 > 0 : syntax error: operand expected (error token is ".1 > 0 ")

Code:
zsh-4.3.14[sysadmin]% awk 'BEGIN { print (.1 > 0) ? "ok" : "ko" }'
ok

# 3  
Old 05-18-2012
Bash does not understand floating point arithmetic..
try this
Code:
# awk 'BEGIN{a=.1;if(a>.01)print "correct";else print "incorrect"}'
correct

in ksh
Code:
a=.1;if (( $a > .01 )) then echo correct ; else echo incorrect ; fi
correct

Last edited by ygemici; 05-18-2012 at 08:13 AM..
# 4  
Old 05-18-2012
Code:
a=.1
if  (( $(echo "${a} > .01" | bc) == 1 )); then
      echo correct
else 
      echo incorrect
fi

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Decimal numbers and letters in the same collums: round numbers

Hi! I found and then adapt the code for my pipeline... awk -F"," -vOFS="," '{printf "%0.2f %0.f\n",$2,$4}' xxx > yyy I add -F"," -vOFS="," (for input and output as csv file) and I change the columns and the number of decimal... It works but I have also some problems... here my columns ... (7 Replies)
Discussion started by: echo manolis
7 Replies

2. Shell Programming and Scripting

ksh Arithmetic syntax error while comparing decimal numbers

Hello, I am having a problem when i execute following script on RHEL 6.4. Same script works fine on another machine where I have same version of RHEL and KSH. Below is the rpm and RHEL version. ossvm12(0)> rpm -qa | grep ksh ksh-20100621-19.el6.x86_64 ossvm12(0)> cat... (7 Replies)
Discussion started by: Adithya Gokhale
7 Replies

3. UNIX for Dummies Questions & Answers

Condition for decimal numbers

Hi experts, My number output has somehting like below filename /temp 0.23 10.23 How do i put a condition to the above numbers? e.g if then the . seem to give me problems. Pls help. thanks ---------- Post updated at 05:25 PM ---------- Previous update was at 05:23 PM... (9 Replies)
Discussion started by: streddy
9 Replies

4. Shell Programming and Scripting

Regarding decimal numbers

Hello... I am new to unix and I am wondering if in a C-shell script , Are we supposed to use only whole numbers........ for example..if a program needs to calculate the average of some numbers........ @ avg = (($1 +$2 + $3)/3)) is returning a whole number.........How can a decimal be... (7 Replies)
Discussion started by: ravindra22
7 Replies

5. Shell Programming and Scripting

Comparing two numbers with decimal point

How to compare two numbers with decimal points ? Is there a way in bash to do this? (33 Replies)
Discussion started by: kinny
33 Replies

6. Shell Programming and Scripting

Comparing Decimal Numbers

Im trying to compare two numbers with decimals but its not working as expected. a=1 b=1.1 if then echo "equal" fi When I do this it says that the numbers are equal. Ultimately Im using -le and -ge in the if statements but I tested with -eq for simplicity. Any way to make this... (3 Replies)
Discussion started by: Grizzly
3 Replies

7. Shell Programming and Scripting

decimal numbers

Hi friends How can I use "for loop" for decimal numbers? ex: 0.1 < x < 0.6 I used this commands but does'nt work. LIMIT=0.6 for ((x=0.1; x<=LIMIT; x++)) do - - - done Many thanks (1 Reply)
Discussion started by: snow
1 Replies

8. Shell Programming and Scripting

Devision of Decimal Numbers?

How can i devide decimal numbers? I am getting this kind of error: line 18: 200.2/40.234: syntax error in expression (error token is ".2/40.234") What can i do to work around this problem? Thanks for any advice. (4 Replies)
Discussion started by: Vozx
4 Replies

9. Shell Programming and Scripting

comparing two decimal values in KSH

Hi Gurus, I wrote a small KSH script, in that i am comparing two variables like this curr_time = date +%h.%m set_time=23.55 If ]; then zip the file fi The above script is croned to run evey 5(3,8,.......,58) minutes, but it is zipping at 23.03 hours. My intention is at 23.58 .what... (4 Replies)
Discussion started by: nandinisagar
4 Replies

10. Shell Programming and Scripting

compare decimal numbers

Hi anyone, i need to compare two decimal numbers i thought that it could be do it with if but... :( So, i'm writing in csh and i really apreciate if anyone can help me if ( $ppl_kn <= $ppl_wb ) then echo "############# KNdiscount model has the lowest perplexity" set... (5 Replies)
Discussion started by: tmxps
5 Replies
Login or Register to Ask a Question