General :: Get The Pathname Of The File And Its Links?

i have to write a shell script that takes name of the file as command line argument and the script should use path envt variable to look for the specified file and specify where are the different instance of the filename specified exist

firstly enter the filename echo "enter the filename" read filename by using ls command we can get to know how many links are there for that file but i don't know how to get the pathname of the file and its links after knowing the pathnames of the file i can set the path variable using export command can any one tell me how to get the pathname of the file i entered as a command line argument