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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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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)
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