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Top Forums Shell Programming and Scripting Parameters passed to commands but not working in Bash shell Post 302378229 by Cypress on Monday 7th of December 2009 09:28:45 AM
Old 12-07-2009
Parameters passed to commands but not working in Bash shell

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, using their mac address.

I have thinked this script:

Code:
for ((i=1;i<63;i++)); do
	arp $(head -n $i host.txt |tail -n 1) | awk '/Cyp/ {$1 $3}' > host_mac.txt
	
done;

This are my trys:

Code:
Cypuysrv456:~# head -n 1 host.txt |tail -n 1
CypUYNB106


Cypuysrv456:~# ping  $(head -n 1 host.txt |tail -n 1)
ping: unknown host CypUYNB106


Cypuysrv456:~# ping CypUYNB106
PING CypUYNB106.hh.Cyp.com (172.Z.X.Y) 56(84) bytes of data.
64 bytes from Cypuynb106.hh.Cyp.com (172.Z.X.Y): icmp_seq=1 ttl=128 time=0.333 ms
64 bytes from Cypuynb074.hh.Cyp.com (172.Z.X.Y): icmp_seq=2 ttl=128 time=0.276 ms
^C
--- CypUYNB106.hh.Cyp.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.276/0.304/0.333/0.033 ms


Cypuysrv456:~#

I'll explain:

Code:
Cypuysrv456:~# head -n 1 host.txt |tail -n 1
CypUYNB106

I get the names of the file and the system returns one by one the hostnames


Code:
Cypuysrv456:~# ping  $(head -n 1 host.txt |tail -n 1)
ping: unknown host CypUYNB106

Dam! it does not recognize the host, maybe the system it can not resolve the hostname.

Code:
Cypuysrv456:~# ping CypUYNB106
PING CypUYNB106.hh.Cyp.com (172.Z.X.Y) 56(84) bytes of data.
64 bytes from Cypuynb106.hh.Cyp.com (172.Z.X.Y): icmp_seq=1 ttl=128 time=0.333 ms
64 bytes from Cypuynb074.hh.Cyp.com (172.Z.X.Y): icmp_seq=2 ttl=128 time=0.276 ms
^C
--- CypUYNB106.hh.Cyp.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.276/0.304/0.333/0.033 ms

Smilie he could resolve it. :S

¿ Why not before ?

I change in the file, the hostname with the completely hostname, but no fortune.

CypUYNB106.hh.Cyp.com

Since some days ago i have joined this machine to the domain ( active directory ) this is a gnu/linux server.

¿ Any idea why the system coud not resolve the name ?

Code:
# cat /etc/resolv.conf
domain hh.Cyp.com
search hh.Cyp.com
nameserver 172.Z.X.F
nameserver 172.Z.W.R

Regards,
 

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