I've checked and found a few links that might help you download the book. Please note that these links are subject to change, and it's always best to verify their integrity before downloading:
unrar t kanetkar_unix_shell.pdf.rar # test integrity # "Missing 5 bytes. Recovery record not found."
: You can find legitimate digital copies for study on platforms like the Internet Archive specific shell script examples from the book to get a feel for its teaching style?