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How to match floating number range in shell scripts?

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# 1  
Old 08-30-2011
Question How to match floating number range in shell scripts?
for example:

# I want to judge the value of $1 which should be $2<$1<$3.
Code:
temp0=`echo "$1 - $2" | bc`
temp1=`echo "$1 - $3" | bc`

if [[ $temp0 =~ 'how  to match a positive number' && $temp1 =~ 'how  to match a negative number' ]] ; then 
     echo OK
else
     echo False
fi

Moderator's Comments:
Mod Comment Please use code tags, thanks.
Last edited by zaxxon; 08-30-2011 at 05:47 AM.. Reason: code tags and added a "fi"
# 2  
Old 08-30-2011
Try this:
Code:
if [ `echo "$1 > $2" | bc -l` -eq 1 -a `echo "$1 < $3" | bc -l` -eq 1 ]; then
 echo OK
else
 echo False
fi

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# 3  
Old 08-30-2011
ksh93, bash, zsh:
Code:
if (( $2 < $1 && $1 < $3)); then 
  echo Ok
else
  echo False
done

===

Well, bash doesn't work with floating numbers. Then
Code:
if [[ ! $temp0 =~ ^- && $temp1 =~ ^- ]]; then 
...

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# 4  
Old 08-30-2011
Above is true, when Your number is in this format:
0,1
It's not working when You have dot in number (like in bc standard):
0.1
Last edited by sulti; 08-30-2011 at 06:33 AM..
This User Gave Thanks to sulti For This Post:
qcmao
# 5  
Old 08-30-2011
Thank you guys~
The advices all of your give me much help.
# 6  
Old 08-30-2011
In this code
Code:
if [ `echo "$1 > $2" | bc -l` -eq 1 -a `echo "$1 < $3" | bc -l` -eq 1 ]

the meaning of parameter "-a" is "and" operator?
This User Gave Thanks to qcmao For This Post:
915086731
# 7  
Old 08-30-2011
Yes ..
Quote:
"-a" --> and
"-o" --> or
These 2 Users Gave Thanks to jayan_jay For This Post:
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