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sub verify {
#   open FILE, "$user_file" || die "Can't open user's login files: $!"
+;
...
     }
     close FILE;
}

for each line in the file
  split up into name and password
...
        cry for help or simply die of error ...
  if the name doesn't match
     go to the next line

while( <FILE> ){
# = for each line of the file
...
# = if the name doesn't match
# go to the next line
}