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 SUSE

tcl_printdouble

Tcl_PrintDouble(3)					      Tcl Library Procedures						Tcl_PrintDouble(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_PrintDouble - Convert floating value to string

SYNOPSIS

       #include <tcl.h>

       Tcl_PrintDouble(interp, value, dst)

ARGUMENTS

       Tcl_Interp *interp (in)		Before	Tcl 8.0, the tcl_precision variable in this interpreter controlled the conversion.  As of Tcl 8.0,
					this argument is ignored and the conversion is controlled by the tcl_precision variable that is now shared
					by all interpreters.

       double value (in)		Floating-point value to be converted.

       char *dst (out)			Where to store the string representing value.  Must have at least TCL_DOUBLE_SPACE characters of storage.
_________________________________________________________________

DESCRIPTION

       Tcl_PrintDouble	generates  a  string  that represents the value of value and stores it in memory at the location given by dst.	It uses %g
       format to generate the string, with one special twist: the string is guaranteed to contain either a "."	or an "e" so that it does not look
       like an integer.  Where %g would generate an integer with no decimal point, Tcl_PrintDouble adds ".0".					   |

       If  the	tcl_precision  value  is  non-zero,  the  result  will have precisely that many digits of significance.  If the value is zero (the |
       default), the result will have the fewest digits needed to represent the number in such a way that Tcl_NewDoubleObj will generate the  same |
       number when presented with the given string.  IEEE semantics of rounding to even apply to the conversion.

KEYWORDS

       conversion, double-precision, floating-point, string

Tcl									8.0							Tcl_PrintDouble(3)