bash while loop

I need to cycles through a loop forever using for or while syntax. How do I set such loop under UNIX or Linux operating systems?

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How do I read a list of ip address (subnets) using a text file and block all of them using Linux iptables command?

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I need to count one character at a time from input.txt. How do I read one character at a time under Linux / UNIX bash shell script?

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Can you provide me a while loop control flow statement shell script syntax and example that allows code to be executed repeatedly based on a given boolean condition?

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