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Finally i get something, but i still do not understand why sometime works, and why sometimes not..

i still can't get some mac address.. anyway i get some others..

I think that the file it self...

I know, the code you wrote, gave me

xargs: arp: exited with status 255; aborting
: Unknown host


Then i change it, just to know if were arp's problem. but the problem it's at the time it is...

Mmm.. not working,

It can not resolve the hostname:


xargs: arp: exited with status 255; aborting
: Unknown host


I put ping in sted of arp, anyway after a ping i can consult arp -a
and...

hosts.txt it's the file where there is the 63 hostnames


# cat host.txt

CypUYNB106
CypUYNB144
CypUYNB150
CypUYNB151
CypUYNB152
CypUYWT1124
CypUYWT1126
CypUYWT1133
CypUYWT1135...

Hi, I am trying to do this thing useing my shell bash ( sorry for my english )

I have in a file 63 hostnames, i wanna ask to the DHCP admin, to reserv that reserves 63 IP addresses of this hosts,...