The output of n-on of script who | sort | awk '{print $1}' | uniq | wc -l is different depend on user file in the system.
Since the result can be answered because it different by each user, but this the mean for each script in Linux.
who is script for the user that currently login into the system.
sort is script to arranged all record with instructed order or by default order
awk is script for manipulate the data and display the result
{print $1} is script to print the the first word for each line
uniq is script to delete duplicate line in the adjacent line
wc is script to word, character, or line count which in script will count line as the parameter is -l
So, we can interpret the script as
sorting the user data and print the first word and if there have duplicate line deleted them and count the line result.
So, basically the script use who that is depend on the current user, then the answer is different depend on user.
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