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i want to sort time field given by who[/B] command as a whole

i have tried like this

who|sort -n +4 -5

I WANT TO numerical sort the fourth field in file
can i use sort command,head command in awk script

if yes, give me sample code

I WANT TO GET OUTPUT LIKE THIS
*
**
***
****
IN SHELL SCRPTING
USING VI EDITOR

I AHVE TRIED THIS

for i in 1 2 3 4
do
for j in $i
do
echo "*"...