How can I get unique values from an array in Bash?

Question

I\'ve got almost the same question as here.

I have an array which contains aa ab aa ac aa ad, etc. Now I want to select all unique elements from this ar

Answer 1

cat number.txt

1 2 3 4 4 3 2 5 6

print line into column: cat number.txt | awk '{for(i=1;i<=NF;i++) print $i}'

1
2
3
4
4
3
2
5
6

find the duplicate records: cat number.txt | awk '{for(i=1;i<=NF;i++) print $i}' |awk 'x[$0]++'

4
3
2

Replace duplicate records: cat number.txt | awk '{for(i=1;i<=NF;i++) print $i}' |awk '!x[$0]++'

1
2
3
4
5
6

Find only Uniq records: cat number.txt | awk '{for(i=1;i<=NF;i++) print $i|"sort|uniq -u"}

1
5
6