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Don't forget to put quotes around \n.
Something like
#!/bin/sh
cat $1 | tr , "\n"
will translate all commas in the file to newlines.

I said "The following code writes characters to the file. (You need to press <ENTER> once before entering EOF - <CTRL>D in UNIX <CTRL>Z in Windows)"
Can you, please tell me in what I am wrong?

1. getchar is an function, not a variable. So, probably you have to use getchar() instead of getchar. This explains the weird value of getchar.

2. getchar returns the integer _value_ of character...

The script prints _all_ domains because of the line:
echo $line;

to print only necessary domains you should write something like:

while read line;
do
echo $line;
REG=whois $line | grep...