Beside the root (which I guess IS guaranteed), is there any other username guaranteed to exist on Unix system? Linux system? Fixed PIDs for those users? If not guaraneed, are there at least any recommendations?
My sampling of several Linux distros showed that users such as 'bin', 'daemon', 'sys', 'www-data' and 'nobody' were present, though PIDs differed a bit so that appears to be 'no' on the PID question...
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