shell script to find the sum of numbers associated with each character in a string

Aagam · 01-23-2012, 10:12 AM

i have just started dealing with shell script.... i want to make a script that adds each letter in a name and gives a total...i ve tried with some commands but i feel that i am falling short of commands, can anyone suggest an appropriate command which can help me with this....
thnx in advance...

Cedrik · 01-23-2012, 10:15 AM

http://tldp.org/LDP/abs/html/string-manipulation.html

grail · 01-23-2012, 10:45 AM

Maybe show what you have tried and where you are stuck?

Aagam · 01-24-2012, 03:56 AM

that string manipulation page was quite useful..but still i didnt get what i want....

Code:

vi
echo "Enter your name"
read n1

i got upto here and just and have been thinking till now....i dont know what to do for getting
aagam=1+1+7+1+13

catkin · 01-24-2012, 04:17 AM

The first step is to use a loop and string manipulation to extract each letter in turn: a, a, g etc.

Have you been able to do that?

kabamaru · 01-24-2012, 07:33 AM

Hello Aagam

Code:

#!/bin/bash

read -p "Enter your name: "
echo "${#REPLY}"

The shell has this functionality built-in. I don't know if it's the kind of solution you were searching for though...

EDIT: just re-read what you're looking for... Obviously this not the solution

kabamaru · 01-24-2012, 09:46 AM

How about this?

It uses a for loop to iterate through the alphabet, if the letter is in the word it counts how many times. Then it calculates the sum and prints it.

Code:

#!/bin/bash

letternum=0
ALPHABET=(Aa Bb Cc Dd Ee Ff Gg Hh Ii Jj Kk Ll Mm Nn Oo Pp Qq Rr Ss Tt Uu Vv Ww Xx Yy Zz)

read -p "Enter your name: " name

for i in ${ALPHABET[@]}; do
	((++letternum))
	if [ "$(echo $name | grep [$i])" ]; then
		occurences=$(echo $name | tr -cd [$i] | wc -c)
		((sum+=letternum*occurences))
	fi
done

echo "$name: sum: $sum"

Cedrik · 01-24-2012, 09:53 AM

Also easy done in perl

Code:

echo aagam | perl -ne 'chomp;map {$x+=(ord)-96} split //,lc;print "$x\n"'

crts · 01-24-2012, 10:18 AM

Hi,

similar to kabamaru's solution but with focus on String manipulation:

Code:

#!/bin/bash

j=0
result=0
arr=({a..z})
read name
while (( j < ${#name} ));do
        i=0
        while (( i < ${#arr[@]} ));do
                [[ ${arr[$i]} = ${name:$j:1} ]] && ((result = result + i + 1)) && break
                ((i++))
        done
        ((j++))
done

echo $result

It can be easily adapted to deal with capital letters, too.

Aagam · 01-24-2012, 10:38 AM

i tried all those one by one, i think that they need minute corrections as i get following outputs.....btw "namesum" is the name by which i ve saved the file
@crts ontrying the method described by you i get

Code:

Syntax error: "(" unexpected

@Cedrik ontrying the method described by you i get

Code:

Syntax error: EOF in backquote substitution

@kabamaru ontrying the method described by you i get

Code:

namesum: 3: Bb: not found
Enter your name: aagam
namesum: 13: Bad substitution

@ catkin, no i am not able to do that..
i would be glad to knw all these methods....
and can anyone give the syntax to find the character in the string by specifying its postion...i tried to do dat with match and index commands but i didnt get desired results...

kabamaru · 01-24-2012, 10:46 AM

I don't know, I 've tested it and it works on my mac and my linux box. Maybe copy-paste didn't work correctly?

try this file (uncompress it with gunzip).

Cedrik · 01-24-2012, 10:55 AM

Quote:

Originally Posted by Aagam

@Cedrik ontrying the method described by you i get

Code:

Syntax error: EOF in backquote substitution

There is no backquote in the code I posted above...

grail · 01-24-2012, 10:57 AM

How about:

Code:

#!/bin/bash

read -p "Enter name: " name

for (( i = 0; i < ${#name}; i++ ))
do
	(( sum += $(printf "%d" "'${name:i:1}") - 96 ))
done

echo $sum

Of course if you want to play with upper and lower case it will take a little rejigging

crts · 01-24-2012, 08:13 PM

Quote:

Originally Posted by Aagam

i tried all those one by one, i think that they need minute corrections as i get following outputs.....btw "namesum" is the name by which i ve saved the file
@crts ontrying the method described by you i get

Code:

Syntax error: "(" unexpected

Not sure why you get that error. I do not get an error when I run it and I checked that there is no typo in my posted solution. Did you type or copy/paste it when you tried it?

Aagam · 01-24-2012, 11:39 PM

@crts, i copy paste-d it..
@grail i tried dat and it gives

Code:

aagam@infinity:~$ sh namesum
Enter name: aagam
namesum: 5: Syntax error: Bad for loop variable

@kabamaru, it still gives the same error......
is there a possibility of terminal being faulty?
and plz tell me the command used to extract a letter from the string by specifying its position...