getHostname.System: Retrieves the computer name of the current host
Description
Retrieves the computer name of the current host.Usage
System$getHostname(...)
synopsis
getHostname.System(static, ...)Details
First, this function checks the system environment variables HOST,
  HOSTNAME, and COMPUTERNAME.
  Second, it checks Sys.info()["nodename"] for host name details.
  Finally, it tries to query the system command uname -n.