How to remove duplicates within a string?

Question

linux

Hello! There is a data.txt file data.txt

content:

001 002 001 00003
007 008 007 0000009

how to remove repetitions so that the output is:

001 002 00003
007 008 0000009

Answer 1

#!/bin/bash
IFS='
'
exec 3<>data.txt
while read -u 3 line
do
(
        IFS=' '
        result=()
        for word in $line
        do
                 && result=(${result[*]} $word)
        done
        echo ${result[*]}
)
done

Answer 2

If the order in the string is not important, then you can simply

while read;do echo $REPLY|xargs -n1|sort -u|xargs; done<data.txt

Answer 3

those. it turns out that with the -u option of the sort command, it is not required to pass the data stream through the uniq command?