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Exit status redirection

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# 1  
Old 07-28-2010
Exit status redirection
Hi,

I'm having this simple code below, the file serverlist has a list of IPs one per line. When executed the while loop is executed only once, after that the program terminates. How should i redirect the exit status, so that the entire list of IP will get executed?

Code:
#!/bin/bash
exec < serverlist
while read i
do
echo "Source IP: 192.168.1.2"
echo "Destination IP: $i"
echo "#ping $i"
ping $i
echo "#telnet $i 22"
telnet $i 22
echo "#traceroute -m 5 $i"
traceroute -m 5 $i 2>/dev/null
done

Last edited by Scott; 07-28-2010 at 08:06 AM.. Reason: Please use code tags
# 2  
Old 07-28-2010
Hi.

Try
Code:
...
exec 3< serverlist
while read i <&3
...

This User Gave Thanks to Scott For This Post:
agent001
# 3  
Old 07-28-2010
MySQL It works
Thank you, it worked.

Could you reason, what was causing that?
# 4  
Old 07-28-2010
Hi.

You're reading standard input from a file, which telnet closes when it's finished.

In ssh, for example, there's the -n option to get around this, but I couldn't see any equivalent telnet option, so instead, read the file from a different descriptor.
# 5  
Old 07-28-2010
MySQL Informational
Thank you for your time in this, that was informational.
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