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Action |
A 20-character parameter that informs the init
command how to process the Command parameter you specify.
The init command recognizes the following actions:
- boot
- Read this record only when the system boots and reads the /etc/inittab file. The init command
starts the process. Do not wait for the process to stop, and when it does
stop, do not restart the process. The run level for this process should be
the default, or it must match the run level specified by the init command at startup time.
- bootwait
- Read this record only when the system boots and reads the /etc/inittab file. The init command
starts the process. Wait for it to stop, and when it does stop, do not restart
the process.
- hold
- When the process identified in this record is terminated, do not start
a new one. The hold action can only be activated by
the phold command.
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- initdefault
- Start the process identified in this record only when the init command is originally invoked. The init command uses this line to determine which run level to originally
enter. It does this by taking the highest run level specified in the RunLevel field and using that as its initial state.
If the RunLevel parameter is empty, this is interpreted
as 0123456789, and the init command enters a run level
of 9. If the init command does
not find an initdefault line in the /etc/inittab file, it requests an initial run level
from the operator at initial program load (IPL) time.
- off
- If the process identified in this record is currently running, send
the warning signal SIGTERM and wait 20 seconds before
sending the SIGKILL kill signal. If the process is nonexistent,
ignore this line.
- once
- When the init command
enters the run level specified for this record, start the process, do not
wait for it to stop, and when it does stop, do not restart the process. If
the system enters a new run level while the process is running, the process
is not restarted.
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- ondemand
- Functionally identical to respawn. If the process
identified in this record does not exist, start the process. If the process
currently exists, do nothing and continue scanning the /etc/inittab file. Specify this action to perform the respawn action when using a, b, or c run levels.
- powerfail
- Start the process identified in this record only when the init command receives a SIGPWR
power fail signal.
- powerwait
- Start the process identified in this record only when the init command receives a SIGPWR
power fail signal, and wait until it stops before continuing to process the /etc/inittab file.
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- respawn
- If the process identified in this record does not exist, start the
process. If the process currently exists, do nothing and continue scanning
the /etc/inittab file.
- sysinit
- Start the process identified in this record before the init command tries to access the console. For example,
you might use this to initialize devices.
- wait
- When the init command
enters the run level specified for this record, start the process and wait
for it to stop. While the init command is in the same
run level, all subsequent reads of the /etc/inittab file ignore this object. If you are operating in a diskless
environment, specifying the wait action causes your
system to boot more quickly.
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Command |
A 1024-character field specifying the shell command. |
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Identifier |
A 14-character parameter that uniquely identifies an object. The Identifier must be unique. If the Identifier is not unique, the command is unsuccessful. The Identifier cannot be changed; if you try to change it, the command is
unsuccessful. |
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RunLevel |
A 20-character parameter defining the run levels in which the Identifier can be processed. Each process started by the init command can be assigned
one or more run levels in which it can be started. |