Single User Mode Questions (mac)

04-17-2012

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Single User Mode Questions (mac)

Hello everyone. Completely new here (so if this post is in the wrong forum point me in the right direction), and fairly new to unix. I have a macbook pro and just recently started messing around with the Single User Mode, where i can manipulate directories/files/etc using unix. I have also just recently learned how to log in as an administrator using the passwd root command and such, which i thought was an interesting hole/hack in the system security and im just curious if anyone knows any other interesting commands/hacks n such that i can mess around with? Like for instance if i wanted to be a real jerk and delete someones operating system (in my case OSX) files and ruin their computer? Not that i would do such a thing, but just curious if its possible. Or any other loopholes or even beneficial mods or anything i can do while in this single user mode?

lsant894

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PROC_COMPARE(3) BSD Library Functions Manual PROC_COMPARE(3) NAME
proc_compare -- compare two processes' interactivity LIBRARY
System Utilities Library (libutil, -lutil) SYNOPSIS
#include <sys/sysctl.h> int proc_compare(const struct kinfo_proc2 *p1, const struct kinfo_lwp *l1, const struct kinfo_proc2 *p2, const struct kinfo_lwp *l2); DESCRIPTION
The proc_compare() function compares two processes that are on the same terminal for their interactivity. This means that the process returned is the one that has a better chance being the active foreground process on that tty. This algorithm is used in the kernel for SIGINFO reporting and in userland by w(1). The algorithm used is as follows: o If one of them is runnable, it is preferred. o If both are runnable, the one with the largest CPU percent is preferred. o In a CPU percent tie, the one started more recently wins. o If none are runnable, and one of them is a zombie, the non-zombie is preferred o If both are zombies, the one started more recently wins. o If neither is a zombie, the one with the smaller sleep time wins. o In a tie, and one is sleeping in non-interruptible sleep, prefer that one. o If both are in the same state, the one started more recently is preferred. In all cases where the most recently started wins, if there was no winner, the one with the largest PID wins. RETURN VALUES
The proc_compare() function returns 0 if p1 is to be preferred and 1 if p2 is to be preferred. SEE ALSO
w(1) HISTORY
The proc_compare() was extracted from src/sys/kern/tty.c and src/usr.bin/w/proc_compare.c and merged in NetBSD 6.0. BSD
October 20, 2011 BSD

Shell Programming and Scripting

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