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HP-UX 11i Version 3: February 2007

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coreadm — core file administration


coreadm [-g pattern] [-I pattern] [-e option] [-d option]

coreadm -P {enable|disable} [pid...]

coreadm -p pattern [pid...]

coreadm -p pattern -E command [arguments]

coreadm [pid...]


The coreadm command is used for user space application core file management by specifying the name and the location of core files for abnormally terminating processes. See core(4).

The command can be used to control system wide and process specific core file placement. The path and pattern is used by the operating system when generating a core file.

The first form shown in SYNOPSIS can be used to control system wide core file settings or specify a pattern for init(1M). System administration privilege is required to change global core file settings. Global core file setting, including the setting for init(1M), is preserved across system reboot.

Non-privileged users can change per-process core file settings for processes owned by that user. The real or the effective user ID of the calling process must match the real or the saved user ID of the receiving process unless the effective user ID of the calling process is a user who as appropriate privileges.

A core file name pattern is a normal file system path name with embedded variables, specified with a leading % character, that are expanded from values in effect when a core file is generated by the operating system. An expanded pattern over MAXPATHLEN will be truncated to MAXPATHLEN.

The possible pattern variables are:

%p process ID %xp Process ID in hex %u effective user-ID %xu effective user-ID in Hex %g effective group-ID %xg effective group-ID in Hex %c thread's CPU number when the core file was created %f executable file name, up to a maximum of MAXCOMMLEN characters %n system node name (uname -n) %t time-stamp (in UTC time format) %% literal %


The following options are supported for coreadm:

-d option...

-e option...

Disable (-d) or enable (-e) the specified core file option. The -d and -e options can only be exercised with root privilege.

The valid options for -d and -e are:


Allow (or disallow) core dumps using the global core pattern.


Allow (or disallow) core dumps using the per-process core pattern.


Allow (or disallow) core dumps using the global core pattern for setid processes.


Allow (or disallow) core dumps using the process core pattern for setid processes.

-g pattern

Set the global core file name pattern to pattern. The pattern must start with an absolute path name which exists and can contain any of the special % variables described in the DESCRIPTION section. This option can only be exercised by the super-user.

-I pattern

This is identical to specifying a per-process pattern only that the setting is applied to init(1M) and is preserved across reboot.

-p pattern

Set the per-process core file name pattern to pattern for each of the specified process-ID's. The pattern can contain any of the special variables described in DESCRIPTION and need not begin with /. If it does not begin with /, the core file name will be evaluated relative to the current working directory at the time of core file creation.

This option can be used by non-privileged users to specify core file settings for processes owned by that user. Super-users can apply it to any process. The per-process core file will be inherited by the future child processes of the affected processes. See fork(2). This option, when invoked without a PID will apply the settings to the calling process (usually the invoking shell).

-E command [arguments]

This option is used in conjunction with -p pattern. The -E option will execute the command specified with the per-process pattern that was specified with -p.

-P {enable|disable} [pid...]

This option can be used to enable or disable core file creation for the target process. As an example, a user may choose to add the coreadm -P $$ disable in the shell startup script to avoid creation of core files by that user.


The following examples assume that the user has appropriate privilege.


To examine the current core file settings:

$ coreadm global core file pattern: init(1M) core file pattern: global core dumps: disabled per-process core dumps: enabled global setid core dumps: disabled per-process setid core dumps: disabled


Set global core file settings to include process-ID and machine name and place the core file in the location /mnt/cores.

$ coreadm -e global -g /mnt/cores/core.%p.%n

  • A process with PID 1777 on the machine breaker will generate a core file in /mnt/cores as core.1777.breaker (in addition to the core file generated in the CWD of PID 1777).


Examine the per process core file settings for process-IDs 1777 and 1778

$ coreadm 1777 1778 1777: core.%p.%u 1778: /nethome/gandalf/core/core.%f.%p.%t


A user can disable creation of core files completely by specifying in the shell startup file (for example, .profile).

$ coreadm -P disable $$ $ coreadm $$ 1157: (Disabled)


The output format of coreadm may change without notice. Applications parsing the coreadm output, should not rely on the compatibility of the output format between releases.

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