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Full Discussion: Syntax error in subtraction in Bash
Top Forums Shell Programming and Scripting Syntax error in subtraction in Bash Post 303040005 by ngabrani on Monday 21st of October 2019 12:50:50 PM
Old 10-21-2019
Syntax error in subtraction in Bash
I am sharing a code snippet.
Code:
for (( i=0; i<=$(( $count -1 )); i++ ))
do

	first=${barr2[$i]}
	search=${barr1[$i]}
        echo $first
	echo "loop begins"
	for (( j=0; j<=5000; j++ ))
	do
		if [[ ${harr1[j]} == $search ]]; then
			echo $j
			break;
		fi

	done
	second=${harr2[$j]}	
	echo $second
	
	diff=$((second-first))
	echo "diff" 
	echo $diff
done

I am getting a syntax error in line of subtraction that says something like:
syntax error: invalid arithmetic operator (error token is ".0985146")

This is the line that gives error.
Code:
	diff=$((second-first))

Appreciate your help.
 

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LEARN ABOUT DEBIAN

gnulib-tool

GNULIB-TOOL(1)						      GNU Portability Library						    GNULIB-TOOL(1)

NAME

       gnulib-tool - program for authors or maintainers which want to import modules from gnulib into their packages.

SYNOPSIS

       gnulib-tool --list

       gnulib-tool --import [module1 ... moduleN]

       gnulib-tool --update

       gnulib-tool --create-testdir --dir=directory module1 ... moduleN

       gnulib-tool --create-megatestdir --dir=directory [module1 ... moduleN]

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       gnulib-tool --extract-include-directive module

       gnulib-tool --extract-license module

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DESCRIPTION

       The  GNU  portability  library  is  a  macro system and C declarations and definitions for commonly-used API elements and abstracted system
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OPTIONS

       Operation modes:

       --list print the available module names.

       --import
	      import the given modules into the current package; if no modules are specified, update the current package from the current gnulib.

       --update
	      update the current package, restore files omitted from CVS.

       --create-testdir
	      create a scratch package with the given modules.

       --create-megatestdir
	      create a mega scratch package with the given modules one by one and all together.

       --test test the combination of the given modules (recommended to use CC="gcc -Wall" here).

       --megatest
	      test the given modules one by one and all together (recommended to use CC="gcc -Wall" here).

       --extract-description
	      extract the description.

       --extract-filelist
	      extract the list of files.

       --extract-dependencies
	      extract the dependencies.

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	      extract the snippet for configure.ac.

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	      extract the snippet for lib/Makefile.am.

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	      extract the #include directive.

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       --extract-maintainer
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       Options:

       --dir=DIRECTORY
	      specify the target directory. For --import, this specifies where your configure.ac can be found. Defaults to current directory.

       --lib=LIBRARY
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	      Directory relative --dir where auxiliary build tools are placed (default "build-aux").

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	      Include unit tests for the included modules.

       --avoid=MODULE
	      Avoid including the given MODULE. Useful if you have code that provides equivalent functionality. This option can be repeated.

       --lgpl Abort if modules aren't available under the LGPL. Also modify license template from GPL to LGPL.

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	      don't update or create ChangeLog files.

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SEE ALSO

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AUTHOR

       gnulib was written by the Free Software Foundation and others (sources of various origins).

       This manual page was written by Daniel Baumann <daniel@debian.org>, for the Debian project (but may be used by others).

0.0.20060601							    2006-06-01							    GNULIB-TOOL(1)
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