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Parameters passed to commands but not working in Bash shell

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# 1  
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,
# 2  
Old 12-07-2009
what is the o/p of :-

Code:
cat hosts.txt.

# 3  
Old 12-07-2009
hosts.txt it's the file where there is the 63 hostnames

Code:
# cat host.txt

CypUYNB106
CypUYNB144
CypUYNB150
CypUYNB151
CypUYNB152
CypUYWT1124
CypUYWT1126
CypUYWT1133
CypUYWT1135
CypUYWT1142
CypUYWT1152

And more hostnames
# 4  
Old 12-07-2009
Try one of the below:-

Code:
for ((i=1;i<63;i++)) ; do
cat <(head -n $i host.txt | tail -n 1) | xargs -n 1 -x arp
done

Code:
for ((i=1;i<63;i++)) ; do
echo $(head -n $i host.txt  | tail -n 1) | xargs -n 1 -x arp 
done


SmilieSmilieSmilie
# 5  
Old 12-07-2009
Mmm.. not working,

It can not resolve the hostname:

Code:
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 no lucky
Code:
Cypuysrv456:~# for ((i=1;i<63;i++)) ; do echo $(head -n $i host.txt  | tail -n 1) | xargs  ping -c 1 ; done
ping: unknown host CypUYWT857
Cypuysrv456:~# ping CypUYWT857
PING CypUYWT857.hh.Cyp.com (172.X.Y.Z) 56(84) bytes of data.
64 bytes from Cypuywt857.hh.Cyp.com (172.X.Y.Z): icmp_seq=1 ttl=128 time=2.31 ms
64 bytes from Cypuywt857.hh.Cyp.com (172.X.Y.Z): icmp_seq=2 ttl=128 time=0.211 ms
^C
--- CypUYWT857.hh.Cyp.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1005ms
rtt min/avg/max/mdev = 0.211/1.264/2.317/1.053 ms
Cypuysrv456:~#

:S
dazed and confused Smilie
# 6  
Old 12-07-2009
Quote:
Originally Posted by Cypress
Mmm.. not working,

It can not resolve the hostname:

Code:
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 no lucky
Code:
Cypuysrv456:~# for ((i=1;i<63;i++)) ; do echo $(head -n $i host.txt  | tail -n 1) | xargs  ping -c 1 ; done
ping: unknown host CypUYWT857
Cypuysrv456:~# ping CypUYWT857
PING CypUYWT857.hh.Cyp.com (172.X.Y.Z) 56(84) bytes of data.
64 bytes from Cypuywt857.hh.Cyp.com (172.X.Y.Z): icmp_seq=1 ttl=128 time=2.31 ms
64 bytes from Cypuywt857.hh.Cyp.com (172.X.Y.Z): icmp_seq=2 ttl=128 time=0.211 ms
^C
--- CypUYWT857.hh.Cyp.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1005ms
rtt min/avg/max/mdev = 0.211/1.264/2.317/1.053 ms
Cypuysrv456:~#

:S
dazed and confused Smilie
this is not the code I wrote to you
Code:
for ((i=1;i<63;i++)) ; do echo $(head -n $i host.txt  | tail -n 1) | xargs  ping -c 1 ; done

what is your OS?
# 7  
Old 12-07-2009
Quote:
Originally Posted by ahmad.diab
this is not the code I wrote to you
Code:
for ((i=1;i<63;i++)) ; do echo $(head -n $i host.txt  | tail -n 1) | xargs  ping -c 1 ; done

what is your OS?
I know, the code you wrote, gave me
Code:
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 queried.. ( if it's queried :S ) the DNS maybe.. when it's executed the command..


My OS is:

Debian Lenny
Code:
Cypuysrv456:~# uname -a
Linux Cypuysrv456 2.6.26-1-686 #1 SMP Fri Mar 13 18:08:45 UTC 2009 i686 GNU/Linux
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