try-from - test program for the tcp_wrapper try-from The try-from command can be called via a remote shell command to find out if the hostname and address are properly recognized by the tcp_wrapper library, if username lookup works, and (SysV only) if the TLI on top of IP heuristics work. Diagnostics are reported through syslog (3) and redirected to stderr. Example: rsh host /some/where/try-from hosts_access (5), hosts_options (5), tcpd (8) Wietse Venema, Eindhoven University of Technology, The Netherlands.