Submit web site - Chapter 8 . Understanding the Boot Process 309
Chapter 8 . Understanding the Boot Process 309 Table 8-9 inittab action Entries Action Function respawn The process will be restarted whenever it is terminated. You will see this used with the getty login processes, which need to be regenerated each time. wait The process is started once, and then init will wait until it is terminated. once The process will be executed only once, when the runlevel is entered. boot The process will be executed at boot, and any runlevel field entries will be ignored. bootwait The process is started at boot, and init will wait for it to complete before continuing. initdefault Specifies the runlevel to enter when the system is booted. sysinit This entry will be executed at boot, before any other boot or bootwait entries. The runlevel field is ignored. powerwait This entry will be processed when the power to the system goes down, as reported by a UPS. init will wait for this to complete before continuing. powerfail The same as powerwait, but init does not wait for this process to complete. powerokwait This process is executed when the power has been restored to the system. init will wait for its completion. powerfailnow This process is executed when the UPS signals to the system that the battery is almost exhausted. ctrlaltdel This entry will be processed when a user presses the Ctrl-Alt-Delete key combination. kbrequest Execute the specified process when the defined special keyboard combination is pressed. The following is an example of the /etc/inittabfile with explanations. # id:3:initdefault: Tells the system the default runlevel to start up in. As you can see, this system is probably a Red Hat system booting up in to multiuser text mode.
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