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Full Discussion: (standard_in)1:syntax error using bc with Cron
Top Forums Shell Programming and Scripting (standard_in)1:syntax error using bc with Cron Post 303020407 by Don Cragun on Wednesday 18th of July 2018 01:54:04 PM
Old 07-18-2018
I would expect echo '(1.8*$celsius+32)' | tr -d '\n' | bc -l to give you the diagnostic message you showed us since bc input needs to be a text file and, by stripping off the <newline> character with the tr element in your pipeline, bc is not getting a text file as input.

You should not get that error with echo "1.8*$celsius+32" | bc -l or with echo "1.8*$celsius+32" | bc, but you might get a different error if the celsius variable has not been set to a numeric string value.

Assuming you're trying to get a floating point result, if you have a 1993 or later version of ksh available on your system (in addition to bash), you could use the much more efficient:
Code:
fahrenheit=$((1.8*$celsius+32))

This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT DEBIAN

device::usb::pcsensor::hidtemper::ntc::external

Device::USB::PCSensor::HidTEMPer::NTC::External(3pm)	User Contributed Perl Documentation   Device::USB::PCSensor::HidTEMPer::NTC::External(3pm)

       Device::USB::PCSensor::HidTEMPer::NTC::Internal - The HidTEMPerNTC external sensor

VERSION

       Version 0.02

SYNOPSIS

       None

DESCRIPTION

       This is the implementation of the HidTEMPerNTC external sensor.

   CONSTANTS
       o  MAX_TEMPERATURE

	  The highest temperature(150 degrees celsius) this sensor can detect.

       o  MIN_TEMPERATURE

	  The lowest temperature(-50 degrees celsius) this sensor can detect.

       o  INITIAL_GAIN

	  The initial gain value used to calculate voltage returned

       o  CALIBRATION_VALUES

	  Values used to calculate Volt7705Calibration

   METHODS
       o  new()

	  Returns a new External sensor object.

       o  celsius()

	  Returns the current temperature from the device in celsius degrees.

	  The formula used to calculate value based on a calibrated key value is created using the Eureqa tool from Cornell Computational
	  Synthesis Lab, http://ccsl.mae.cornell.edu/eureqa.

	  Resulting in the use of this formula instead of the provided number list: f(y)=66.7348/(66.7275/(67.8088 - 9.70353*log(0.000251309 +
	  y*y)) - 0.21651)

	  If you find another formula that is more accurate please drop me a line.  The data used can be found in the source code of this file.

INHERIT METHODS FROM

       Device::USB::PCSensor::HidTEMPer::Sensor

DEPENDENCIES

       This module internally includes and takes use of the following packages:

	 use Carp;
	 use Time::HiRes qw / sleep /;
	 use Device::USB::PCSensor::HidTEMPer::Sensor;

       This module uses the strict and warning pragmas.

BUGS

       Please report any bugs or missing features using the CPAN RT tool.

FOR MORE INFORMATION

       None

AUTHOR

       Magnus Sulland < msulland@cpan.org >

ACKNOWLEDGEMENTS

       This code includes findings done by Robin B. Jensen, http://www.drunkardswalk.dk, when converting the received hex values into volt.

COPYRIGHT &; LICENSE
       Copyright (c) 2010 Magnus Sulland

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.10.1							    2010-07-24		      Device::USB::PCSensor::HidTEMPer::NTC::External(3pm)
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