Well, if you read the documentation, it says about getpwent:
These routines are the same as their counterparts in the system C library.
If this does not help, google it: getpwent, first find is http://man7.org/linux/man-pages/man3/getpwent.3.html and says:
The first time
getpwent() is called, it returns the first entry; thereafter, it
returns successive entries.
This little piece of code shows what happens:
while(@x=getpwent()){
print "@x\n";
}
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