chcore Command

Purpose

Changes the corefile settings.

Syntax

chcore [ -R registry ] [ -c {on|off|default} ] [ -p {on|off|default} ] [ -l {path| default] [ -n {on|off|default} ] [ username | -d ]

Description

The chcore command is the user interface to change the core settings. It has the following usage:

chcore [-R registry] options [username|-d]

where,

options is at least one (and possibly more) of the following:

-c {on|off|default}

setting for core compression

-p {on|off|default}

setting for core location

-l path

specify directory to use

-n {on|off|default}

setting for core naming

If -d is specified, chcore will change the default setting for the system. The -d option is mutually exclusive with a specified username and with any specification of a registry. If neither -d nor a username is supplied, chcore will change the setting for the current user. Both the -d option and the ability to change settings for another user (other than the current user) are privileged operations, and may only be run by root or another user with system authority. Any changes made will not take effect until the next login session.

To change attributes an alternate Identification and Authentication (I&A) mechanism, the -R flag can be used to specify the I&A load module. If the -R flag is not specified, the chcore command uses the default attributes. Load modules are defined in the /usr/lib/security/methods.cfg file.

Note: The core settings changed by the chcore command are persistent across reboots of the system.

Flags

Item	Description
-c {`on`\|`off`\|`default`}	Setting for core compression.
-d	Changes the default setting for the system.
-l path	Directory path for stored corefiles.
-n {`on`\|`off`\|`default`}	Setting for core naming.
-p {`on`\|`off`\|`default`}	Setting for core location.
-R registry	Specifies the loadable I&A module.

Security

The command can only be run by root or another user with system authority.

Attention RBAC users and Trusted AIX® users: This command can perform privileged operations. Only privileged users can run privileged operations. For more information about authorizations and privileges, see Privileged Command Database in Security. For a list of privileges and the authorizations associated with this command, see the lssecattr command or the getcmdattr subcommand.

Examples

To make any process run by root dump compressed core files and restore the location of the core files to the system default, type:
```
chcore -c on -p default root 
```
Note: If no default is specified, cores will dump in the current directory.
To enable a default core path for the system, type:
```
chcore -p on -l /corefiles -d
```
Note: All users who do not explicitly disable the core path with chcore -p off or override the core path with chcore -l will dump core files into the directory /corefiles. If a user does not have write permission to that directory, or the directory does not exist, no corefile will be generated.

Files

Item	Description
/usr/lib/security/methods.cfg	Contains load module definitions.
/etc/security/user	Contains extended user attributes.