Useful debug/rescue commands
history
grep
diff
find /dir -cmin -60
strace command
tail -f logfile
Generate additional information
*.debug in syslog
–debug option in application

Things to Check: Boot Process
Bootloader configuration
Kernel
Starting init
/sbin/init
/etc/rc.d/rc.sysinit
Entering runlevel [0-6]
/etc/rc.d/rc, /etc/rc.d/rc[0-6].d/
/etc/rc.d/rc.local
Virtual Consoles
X Display Manager

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