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Operating Systems HP-UX /dev/Null error
# 1  
Old 12-21-2011
/dev/Null error
Hi Guru's,
I am trying to test the network speed or load by this command.
but getting error " Not Connected ". Could you guys please help.
Code:
ftp> put "|dd if=/dev/zero bs=8k count=1000000" /dev/null
Not connected.

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code tags!
Last edited by vbe; 12-21-2011 at 09:04 AM..
# 2  
Old 12-21-2011
What is this bit of code?
a screen copy of your passed command and output?
Otherwise, explain to us how it should work, expecially ftp>
# 3  
Old 12-21-2011
/dev/Null error
This code or command is used to test the network load, I mean we are just creating a load with out any disk usage in to the network, say some thing like loopback.
and with put command we get the execution of the command from source to destination.

"|dd if=/dev/zero bs=8k count=1000000" - creates 8GB of load with all Zero's
Put - normal put command
/dev/null - Null device used as destination. to send all data created to null device
# 4  
Old 12-21-2011
Ok...
But that doesnt say what ftp > is?
For it look to me like you typed ftp and enter...
Which will not work...
# 5  
Old 12-21-2011
Demonstration:
Code:
ant:/home/vbe $ ftp
ftp> put "|dd if=/dev/zero bs=8k count=1000000" /dev/null
Not connected.
ftp> quit

versus

Code:
ant:/home/vbe $ ftp zra01
Connected to zra01.cet.XX.
220 zra01 FTP server (Version 1.1.214.8 Fri Apr 20 07:27:42 GMT 2001) ready.
Name (zra01:vbe): 
331 Password required for vbe.
Password:
230 User vbe logged in.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> put "|dd if=/dev/zero bs=8k count=1000000" /dev/null
200 PORT command successful.
150 Opening BINARY mode data connection for /dev/null.
1000000+0 records in
1000000+0 records out
226 Transfer complete.
8192000013 bytes sent in 692.35 seconds (11554.91 Kbytes/s)
ftp>

This User Gave Thanks to vbe For This Post:
ctsgnb
# 6  
Old 12-21-2011
This is interesting, how portable is that pipe feature?
# 7  
Old 12-21-2011
Greetings corona,

It applies to AIX but now I've tried, works for HP-UX, source:
Help -
Last edited by vbe; 12-21-2011 at 03:44 PM.. Reason: typos
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