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Full Discussion: Printing the sum of a numbers
Top Forums Shell Programming and Scripting Printing the sum of a numbers Post 302328925 by chrs0302 on Thursday 25th of June 2009 01:14:26 PM
Old 06-25-2009
Printing the sum of a numbers
Hi

I am writing a script that will produce the total of the digits with in the number. Here is the script.

[root@***/]-bash# cat Sum_Digits
if [ "$? -lt 1" ]
then
echo "You must enter at least two digits"
echo "If you enter more than two digits after the base line program this script will print the sum of the digits"
echo "For examples if you enter $0 456 then this script will print the sum of the three digits as 15 (4+5+6)"
fi

n=$1
sd=0
sum=0

while [ "$n" -gt "0" ]
do
sd=`expr $n % 10`
sum=`expr $sum + $sd`
n=`expr $n / 10`
done

echo "The sum of the number: $sum"

The script works fine when I mentioned the number following the base line program as shown below

[root@*** /]-bash# ./Sum_Digits 45667
You must enter at least two digits
If you enter more than two digits after the base line program this script will print the sum of the digits
For examples if you enter ./Sum_Digits 456 then this script will print the sum of the three digits as 15 (4+5+6)
The sum of the number: 28

But it fails when I just enter the script with out any number

[root@crjueyudev01 /]-bash# ./Sum_Digits
You must enter at least two digits
If you enter more than two digits after the base line program this script will print the sum of the digits
For examples if you enter ./Sum_Digits 456 then this script will print the sum of the three digits as 15 (4+5+6)
./Sum_Digits: line 12: [: : integer expression expected
The sum of the number: 0

I tried with out quotes and the error message comes back as usual

Thanks
 

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checkbashisms

CHECKBASHISMS(1)					      General Commands Manual						  CHECKBASHISMS(1)

NAME

       checkbashisms - check for bashisms in /bin/sh scripts

SYNOPSIS

       checkbashisms script ...
       checkbashisms --help|--version

DESCRIPTION

       checkbashisms, based on one of the checks from the lintian system, performs basic checks on /bin/sh shell scripts for the possible presence
       of bashisms.  It takes the names of the shell scripts on the command line, and outputs warnings if possible bashisms are detected.

       Note that the definition of a bashism in this context roughly equates to "a shell feature that is not required to be supported  by  POSIX";
       this means that some issues flagged may be permitted under optional sections of POSIX, such as XSI or User Portability.

       In  cases  where  POSIX	and  Debian  Policy  disagree, checkbashisms by default allows extensions permitted by Policy but may also provide
       options for stricter checking.

OPTIONS

       --help, -h
	      Show a summary of options.

       --newline, -n
	      Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.)

       --posix, -p
	      Check for issues which are non POSIX but required to be supported by Debian Policy 10.4 (implies -n).

       --force, -f
	      Force each script to be checked, even if it would normally not be (for instance, it has a bash or non POSIX shell shebang or appears
	      to be a shell wrapper).

       --extra, -x
	      Highlight lines which, whilst they do not contain bashisms, may be useful in determining whether a particular issue is a false posi-
	      tive which may be ignored.  For example, the use of "$BASH_ENV" may be preceded by checking whether "$BASH" is set.

       --version, -v
	      Show version and copyright information.

EXIT VALUES

       The exit value will be 0 if no possible bashisms or other problems were detected.  Otherwise it will be the sum of the following error val-
       ues:

       1      A possible bashism was detected.

       2      A file was skipped for some reason, for example, because it was unreadable or not found.	The warning message will give details.

SEE ALSO

       lintian(1).

AUTHOR

       checkbashisms  was originally written as a shell script by Yann Dirson <dirson@debian.org> and rewritten in Perl with many more features by
       Julian Gilbey <jdg@debian.org>.

DEBIAN
								 Debian Utilities						  CHECKBASHISMS(1)
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