Test temperature and alert Post: 303023763

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Top Forums Shell Programming and Scripting Test temperature and alert Post 303023763 by drysdalk on Friday 21st of September 2018 07:39:18 PM

09-21-2018

Registered User

Hi,

Aside from missing out the $ before your variable name as has been pointed out, the other problem you'll have here is that you have to cast your temperature variable (which is a floating-point number) into an integer. Bash built-in arithmetic of the kind we're using here solely works with integers, and not floats.

There are many ways you could do that - off the top of my head, you could get an external integer calculator (such as bc) to divide it by one, which will have the effect of trimming off the decimal part.

For example:

Code:

#!/bin/bash

temperature=44.55
integer=`echo "$temperature / 1" | /usr/bin/bc`

echo "Before conversion: $temperature"
echo "After conversion: $integer"

if [ "$integer" -le "90" ]
then
        echo "Less than 90, so that's OK"
        exit 0
else
        echo "Oh no, it's at least 90 !"
        exit 1
fi

So here I start with a hard-coded floating point value for temperature, get bc running in its default integer-only mode to divide it by one, assign that result to a variable called integer, and do my Bash arithmetic operators on that integer.

Here's an example session.

Code:

$ ./example.sh 
Before conversion: 44.55
After conversion: 44
Less than 90, so that's OK
$

Hope this helps.

drysdalk

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LEARN ABOUT HPUX

powd64

powd64(3M)																powd64(3M)

NAME

       powd64(), powd128(), powd32() - decimal power functions

SYNOPSIS

DESCRIPTION

       The function returns

       is a version of it takes arguments and returns a result.

       is a version of it takes arguments and returns a result.

       These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.

USAGE

       To use any of these functions, compile with the option.

       Make sure your program defines and then includes

       Link in the math library by specifying or on the linking command line.

       For more information, see the at the following site:

RETURN VALUE

       and raises the divide-by-zero floating-point exception for y an odd integer < 0.

       returns +infinity and raises the divide-by-zero floating-point exception for y<0 and not an odd integer.

       for y an odd integer > 0.

       returns +0 for y>0 and not an odd integer.

       returns 1.

       returns 1 for any x, even NaN.

       returns 1 for any x, even NaN.

       returns NaN and raises the invalid floating-point exception for finite x<0 and finite non-integer y.

       returns +infinity for |x|<1.

       returns +0 for |x|>1.

       returns +0 for |x|<1.

       returns +infinity for |x|>1.

       returns -0 for y an odd integer < 0.

       returns +0 for y<0 and not an odd integer.

       returns -infinity for y an odd integer > 0.

       returns +infinity for y>0 and not an odd integer.

       returns +0 for y<0.

       returns +inf for y>0.

       Otherwise, if either argument is NaN, then returns NaN.

       returns	the  properly signed infinity (or, in some non-default rounding direction modes, the properly signed maximum-magnitude finite num-
       ber) in lieu of a value whose magnitude is too large, and raises the overflow and inexact exceptions.

       raises the underflow exception whenever a result is tiny (essentially subnormal or zero) and inexact.

       raises the inexact exception whenever a rounded result does not equal the mathematical result.

ERRORS

       For finite x<0 and finite non-integer y, sets to

       sets to if y is an odd integer < 0.

       sets to if y<0 and not an odd integer.

       If the correct value would overflow, sets to

SEE ALSO

       cbrtd64(3M), expd64(3M), logd64(3M), scalblnd64(3M), scalbnd64(3M), sqrtd64(3M), math(5).

STANDARDS CONFORMANCE

       These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support decimal floating-point arithmetic".

							     HP Integrity Server Only							powd64(3M)