Chapter 10: Starting and stopping the system

Table of contents

• Chapter 10: Starting and stopping the system
  • Starting the system
    • Loading the operating system
    • Saving/deleting a system memory image
    • Cleaning filesystems
    • Choosing the mode of system operation
    • Setting the time and date at startup
    • Setting the time and date during normal operation
    • Changing the system time zone
    • Checking the security databases
  • Stopping the system
    • Using the shutdown command line
    • Using the haltsys command
  • Logging in as the superuser
  • Understanding the hardware information displayed at boot time
  • Changing the startup process
    • Changing the system restart options
    • Changing the default bootstring (DEFBOOTSTR)
    • Booting an old kernel
  • Troubleshooting system startup
    • About missing or corrupted system files
    • Restoring critical security database files
    • System fails to boot or displays ``NO OS'' message
    • boot not found
    • unix not found
    • Cannot load floating point emulator
    • Cannot exec /bin/login: No such file or directory
    • Cannot open /etc/inittab
    • /etc/initscript: /bin/sulogin: not found
    • /etc/initscript: /etc/bcheckrc: not found
    • no utmp entry. You must log in from lowest level -sh
    • Fork failed... Resource temporarily unavailable
    • System hangs at boot time
    • Console keyboard locks up
    • Cannot log into console