6.22.2 File descriptors for the commands that are executed from HA Monitor

The following table shows the file descriptors for standard input, standard output, and standard error output that are used when a user-created command is executed.

Table 6‒23: File descriptor used when the command is executed
No.	Command	File descriptors for standard input, standard output, and standard error output
1	User command (changing the status of HA Monitor) (changing the status of the server)	`/dev/null`
2	Server start command	`/dev/null` The PC on which the `monbegin` command is executed is used as the input source and output destination in the following cases: The `monbegin` command is executed to start the active server. The server that was started as the standby server by executing the `monbegin` command is started as the active server when hot-standby switchover occurs.
3	Server termination command	`/dev/null`
4	Server monitoring command	`/dev/null`

In most cases, the standard input, standard output, and standard error output that are used when a command is executed are redirected to /dev/null. For example, if the echo command is executed from a user command, nothing is output to the PC that the user is operating.

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