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a network switch may, optionally, have a management interface. such an interface may use public/private keypairs for authentication. some switch-like network devices may also use authentication to...

strtok is very 70's, and scanf can do the job here. but slurping the line into a fixed-size buffer, for robustness, can still work:
#include <stdio.h>
int main() {
char...

no: see "Short-circuit evaluation" in wikipedia.

I have to admit I'm pretty turned off by this kind of shell script - spawning way too many trivial processes to perform minor processing. for instance, in perl:

#!/usr/bin/perl
use strict;...