Shell Programming and Scripting

i have a file named (Loop) that contains numbers separated by pipelines
e.g. :

Code:

521|55
545|564
.
.
.

and another file named (search) that contains numbers e.g.:

Code:

99999777|332|332
31215648|458|764

when i run this Script:

Code:

nawk 'BEGIN{FS="|"}
NR==FNR{a[$1"|"$2"|"]= $1"|"$2"|";next}
a[$1"|"$2"|"]{print "found";next}1' Loop search| grep -v found  | grep -v "^[1-2]|"> final

this script is supposed to compare the files (loop) to the file (search), if there's something in (search) that doesn't exist in the (Loop), the output will be redirected to a file named (final), but i can't seem to understand how it works!!!

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thanx for ur feedback, it's my first time using unix forums, i'll make sure to follow the guidlines