Shell Programming and Scripting

Hi....I need one help....

I'm having a files which is having the data as follows...
a
b
c c
d d d
e
f

Now I need to find out distinct characters from this file and the output should be as follows -

a
b
c
d
e
f

Can you please help me on this? I'm using KSH script.

Thanks,
Krishanu

Is this homework? If not, can you show us what have you tried so far?

This is not a homework. Actually I'm working in one project where I have one similar kind of file which is having list of special characters (removed from xml file) exactly in same format. Now I need to find out the records from that xml files which is having those special characters. I have done everything and now the pending item is only this. That's why I need help. Any help will be highly appreciated.

Thanks.

Using Associative Array in KSH:

Code:

#!/bin/ksh

typeset -A ARR

while read line
do
        for char in $line
        do
                (( ARR[$char] ))
        done
done < file

for k in ${!ARR[*]}
do
        print $k
done

Using awk program:

Code:

awk '{ for(i=1;i<=NF;i++) !A[$i]++ } END { for(i in A) print i } ' file

Thanks Yoda. I've tried both options but did not get the expected result.

When I'm using the 1st option within a function, it is showing the error "typeset bad option" and when I'm using the 2nd option with nawk, it is working, but I'm getting the same list of characters in output, not distinct character.

Is there any options?

I think awk needs the -F"" option otherwise it will split on whitespace, not characters.

somehow the "typeset -A ARR" is not working in script, every time it is displaying the error message "typeset bad option(s)". Can anyone please help to find out the distinct character list?

Thanks,
Krishanu