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+======Synopsis:======
+[[on]] [<modes>]exec_errors [<serial#>] [-|^]<match> { <action> }
+======Description:======
+This hook is triggered whenever an [[exec command|EXEC]]ed process produces output to
+standard error.
+======Parameters:======
+|$0    |process number or name of the [[exec command|EXEC]]ed process   |
+|$1-   |a line of the process's output to stderr                        |
+======Default behavior:======
+If you do not suppress this event, the client will format the message
+and display it to your screen **UNLESS** you are redirecting the output
+of that [[exec]] to somewhere else.
+======Examples:======
+To distinguish process errors from other window output:
+   on ^exec_errors "*" {
+      echo [$0 ERR] $1-
+   }