> # Logging Controller (LOGR) Commands

> ### ALTER

> Starts or stops logging of VAILOG trace messages.

> Parameters

> TRACE=ON | OFF

> Turns on or off logging of trace messages sent by components.

> COMPNT=ALL | component_ID

> Specifies which components will have messages logged. This can be set to ALL (messages from all system components) or to a component ID (messages for that component only). Valid component IDs are:

> C | Common or shared components (operator interface, for example)
> D | DB2 or RRS component
> L | Generic log component
> S | Server controller component
> T | Threadpool component

> Examples

> `LOGR ALTER TRACE=ON COMPNT=ALL` sets tracing on for all components.

> `LOGR ALTER TRACE=OFF COMPNT=T` sets tracing off for the threadpool component.

> `LOGR ALTER TRACE=OFF COMPNT=ALL` sets tracing off for all components.

> ### PRINT

> Prints a SequeLink Server system log.

> Parameters

> LOG=log_name

> Prints the primary log, VAILOGP, or the secondary log, VAILOGS. The default is the inactive log.

> CLASS=class_name

> Indicates which SYSOUT class to which to spool the printout. The default is A.

> HOLD=Y | N

> Indicates whether the output is to be held on the output queue. Valid values are Y (Yes) or N (No). The default is N.

> NOTE: All parameters are optional.

> Example

> `LOGR PRINT CLASS=L` spools the inactive log to the JES2 output class L; the output is not held in the output queue.

> ### STATUS

> Displays the status of the message logging component (LOGR).

> Parameters

> None

> Example

> `LOGR STATUS` returns a single line, providing the general status of the logging component.

> ### SWITCH

> Changes the active log. This command switches to the alternate log, making the current log available for printing or archiving.

> Parameters

> None

> Example

> `LOGR SWITCH` changes the active log. For example, if the primary log (VAILOGP) is active when this command is issued, the secondary log (VAILOGS) becomes the active log. Issuing the command again makes VAILOGP the active log again.