Removing duplicates on a variable without sorting

Question

I have a variable that contains the following space separated entries.

variable=\"apple lemon papaya avocado lemon grapes papaya apple avocado mango banana\"         


        

Answer 1

shell

declare -a arr
variable="apple lemon papaya avocado lemon grapes papaya apple avocado mango banana"
set -- $variable
count=0
for c in $@
do
    flag=0
    for((i=0;i<=${#arr[@]}-1;i++))
    do
        if [ "${arr[$i]}" == "$c" ] ;then
            flag=1
            break
        fi
    done
    if  [ "$flag" -eq 0 ] ; then
        arr[$count]="$c"
        count=$((count+1))
    fi
done
for((i=0;i<=${#arr[@]}-1;i++))
do
   echo "result: ${arr[$i]}"
done

Result when run:

linux# ./myscript.sh
result: apple
result: lemon
result: papaya
result: avocado
result: grapes
result: mango
result: banana

OR if you want to use gawk

awk 'BEGIN{RS=ORS=" "} (!($0 in a) ){a[$0];print}'