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AIX Version 4.3 System Management Guide: Operating System and Devices
Changing the /etc/inittab File
In some cases, you may need to add, change, list, and remove records in the /etc/inittab file. The /etc/inittab file defines which processes to start at each run level. When you run the init command, it reads the records in the /etc/inittab file. Each record defines a run level for a specific process and contains four parameters:
Identifier |
Identifies unique objects in one to fourteen characters. |
Run Level |
Defines the run levels in which the object can be processed in one to twenty characters. |
Action |
Defines what action the init command should take for this process. The following actions can be specified: respawn, wait, once, boot, bootwait, powerfail, powerwait, off, hold, ondemand, initdefault, and sysinit. |
Command |
Contains the shell command to be executed. |
The following commands are the only supported method for modifying the records in the /etc/inittab file:
chitab |
Changes records in the /etc/inittab file. |
lsitab |
Lists records in the /etc/inittab file. |
mkitab |
Adds records to the /etc/inittab file. |
rmitab |
Removes records from the /etc/inittab file. |
Adding Records
To add a record to the /etc/inittab file, type mkitab
Identifier
:
Run Level
:
Action
:
Command
and press the Enter key.
For example, to add a record for tty2, type:
mkitab tty002:2:respawn:/usr/sbin/getty /dev/tty2
In the above example:
tty002 |
Identifies the object whose run level you are defining. |
2 |
Specifies the run level at which this process should run. |
respawn |
Specifies the action that the init command should take for this process. |
/usr/sbin/getty /dev/tty2 |
Specifies the shell command to be executed. |
Changing Records
To change a record to the /etc/inittab file, type chitab
Identifier
:
Run Level
:
Action
:
Command
and press the Enter key.
For example, to change a record for tty2 so that this process runs at run levels 2 and 3, type:
chitab tty002:23:respawn:/usr/sbin/getty /dev/tty2
In the above example:
tty002 |
Identifies the object whose run level you are defining. |
23 |
Specifies the run levels at which this process should run. |
respawn |
Specifies the action that the init command should take for this process. |
/usr/sbin/getty /dev/tty2 |
Specifies the shell command to be executed. |
Listing Records
To list records in the /etc/inittab file:
- To list all records, type lsitab -a
and press the Enter key.
- To list a specific record, type lsitab
Identifier
and press the Enter key.
For example, to list the record for tty2, type lsitab tty2
and press the Enter key.
Removing Records
To remove a record from the /etc/inittab file, type rmitab
Identifier
and press the Enter key. For example, to remove the record for tty2, type rmitab tty2
and press the Enter key.
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