ARP and Bonjour to build list of user devices Post: 302993622

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Top Forums UNIX for Beginners Questions & Answers ARP and Bonjour to build list of user devices Post 302993622 by drysdalk on Sunday 12th of March 2017 10:22:11 AM

03-12-2017

Registered User

Hi,

In general, if a command works at the shell prompt, it should work if that same command is put in a script that is run by that same shell. What might be happening here perhaps is that paths when running via crontab might not be what you'd expect.

If you try in your script putting full absolute paths to all binaries and files, does it then work OK via a crontab entry ? That's probably the first thing to try, since if this approach is working for you at the command line, it should (generally speaking) work in a script as well.

Also make sure the shebang line at the top of your script matches the shell you expect to use to run the script (so #!/bin/bash for Bash, for instance), in case there is a difference between your own shell and the system default shell, or the shell the user is running as in cron.

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arp

arp(8c) 																   arp(8c)

Name
       arp - address resolution display and control

Syntax
       arp -a [vmunix] [kmem]
       arp [-d] hostname
       arp -f filename
       arp -s hostname ether_addr [temp] [pub] [trail]

Description
       The program displays and modifies the Internet-to-Ethernet address translation tables used by the address resolution protocol

       The hostname is the name of the host system for which information will be displayed or modified.

       With no flags, the program displays the current ARP entry for hostname.

Options
       -a   Displays current Address Resolution Protocol (ARP) entries from the specified name list and core files (next arguments).  If not spec-
	    ified, uses and respectively.

       -d   Deletes the entry for the host specified by name (next argument).

       -f   Reads information from the specified file (next argument) and modifies entries accordingly.  Entries in the file should be of the fol-
	    lowing form, with argument meanings as given previously:
	    hostname ether_addr [ temp ] [ pub ] [ trail ]

       -s   Creates an ARP entry for the host called hostname with the Ethernet address ether_addr.  The Ethernet address is given as six hexadec-
	    imal bytes separated by colons.  The entry will be permanent unless the word temp is given in the command.	If the word pub is  given,
	    the  entry will be published.  That is, the system will act as an ARP server, responding to requests for hostname even though the host
	    address is not its own.  The word trail indicates that trailer encapsulations may be sent to this host.

See Also
       arp(4p), ifconfig(8c)

																	   arp(8c)