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hi can anyone please tell me the difference between carriage return, linefeed and newline ?

i am not able to understand the following code for awk:

$awk -F"|" '{ kount[$3]++}
>END { for (desig in kount)
> print desig,kount[desig] }' emp.list

the input file i.e. emp.list is ::
3432|...