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Top Forums Shell Programming and Scripting Write a shell program to find the sum of alternate digits in a given 5-digit number Post 302094542 by rajnikanth.1912 on Monday 30th of October 2006 12:17:57 AM
Old 10-30-2006
You need to initialise the variables num and sum

#!/bin/ksh

a=12346
b=`expr length $a`
echo " length : $b"
typeset -i i=1
num=0
sum=0
while (( i <= $b ))
do
((num=$(echo "${a}" | cut -c "${i}") ))
if (( i == 1 )); then
printf "$num"
else
printf "+$num"
fi
((sum=sum + num))
((i=i+2))
done
printf "=${sum}\n"
~

Answer
-------
length : 5
1+3+6=10
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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