This run variable does not apply to pbssh. If it is present in the policy, it could produce undesirable results.
String. user is read-only. runuser is modifiable.
The user and runuser variables specify the user name that is associated with the login name of the user that submitted the current task request (that is, the submitting user). By default, the current task runs under this user ID.
To change the user ID the current task runs under, set the runuser variable.
runuser = string;
A string that contains a valid user name on the run host. user is a read-only variable and therefore has no default value. The default value of runuser is empty.
runuser = "root";