#Mention shell in which the command lines will be executable
#!/bin/bash

if [ $# -ne 1 ]
then
#echo command is used to display line of text/string that are passed as an argument
    echo "First check if user is local !! "
    echo "Τrying passwd"

#trying to find if the user ($ 1) exists in the path: etc/passwd
#if user is found, then we have to print the 5th item (at line)which is users name
    awk -F: '{print $5}'  /etc/passwd | sort -r | grep $1

else

    echo "Check if user is remote !!"
    echo "Trying getent passwd"

# first the gatent passwd command looks for the user ($ 1) and then cuts the line  #where containing it (with grep command).
# then the result goes to awk command, to print the 5th item (at line), which is the #users name

    getent passwd |grep $1 |awk -F: '{print $5}'

fi