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Need script help for monitoring duplex settings

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Top Forums Shell Programming and Scripting Need script help for monitoring duplex settings
# 1  
Old 03-25-2013
Need script help for monitoring duplex settings
So I have a server I am trying to set up a script to send a Wall message notifying of my eth0 nic being set to 100 half duplex instead of 100 full duplex.

I know I am trying to read from /etc/sysconfig/network/ifcfg-eth0 to pull the parameters

Code:
STARTMODE=onboot
BOOTPROTO=static
ETHTOOL_OPTIONS='speed=100
duplex=half
autoneg=off'
IPADDR=192.168.62.80
NETMASK=255.255.255.0

So when in the above condition, activate alarm message to console every 20 seconds. I am very new to shell scripting so any and all help is welcome.
Last edited by joeyg; 03-25-2013 at 03:00 PM.. Reason: Please wrap code and data in CodeTags
# 2  
Old 03-25-2013
What are you trying to check for?
Are you looking to trap for the speed and duplex only?
And, is 100 full the only valid data - anything else is a problem?
# 3  
Old 03-25-2013
Quote:
Originally Posted by joeyg
Are you looking to trap for the speed and duplex only?
And, is 100 full the only valid data - anything else is a problem?
yes, speed and duplex only. Auto-negotiate on is also something I am looking for but at the very least, 100 full duplex.
The reason is I have a few servers that have mysteriously switched settings to 100 half. I don't care how they changed, I just need to know asap so as to correct the condition before network communications get too out of hand.
# 4  
Old 03-25-2013
Seems the speed isn't changing in any case but only the duplex mode. Since you already have ethtool available, here's a start:
Code:
DUPLEX=$(ethtool eth0 | sed -n 's/Duplex:\(.*\)/\1/p')
if [ $DUPLEX = Full ]
then
   # Do something
elif [ $DUPLEX = Half ]
   # Do something else
fi

# 5  
Old 03-25-2013
Quote:
Originally Posted by verdepollo
Seems the speed isn't changing in any case but only the duplex mode. Since you already have ethtool available, here's a start:
Code:
DUPLEX=$(ethtool eth0 | sed -n 's/Duplex:\(.*\)/\1/p')
if [ $DUPLEX = Full ]
then
   # Do something
elif [ $DUPLEX = Half ]
   # Do something else
fi

This is just the starting point I need. Thank you so much! I'll plug in the parameters I need and post the results!

---------- Post updated at 01:22 PM ---------- Previous update was at 11:30 AM ----------

Pardon my lack of knowledge here but I seem to be getting syntax errors with the "fi" at the end of the file? I tried running the dos2linux command to ensure there are no weird characters at the end of the file. Am I missing something within?

starbuck:/home/acc4000d # ./duplex72
./duplex72: line 8: syntax error near unexpected token `fi'
./duplex72: line 8: `fi'


Code:
#!/bin/sh
DUPLEX=$(ethtool eth0 | sed -n 's/Duplex:\(.*\)/\1/p')
if [ $DUPLEX = Full ]
then
   echo "All is good in the neighborhood"
elif [ $DUPLEX = Half ]
    echo "Check eth0 settings, I am at 100 half duplex. Do IT NOW!!!"
fi

# 6  
Old 03-25-2013
Quote:
Originally Posted by lutador72
starbuck:/home/acc4000d # ./duplex72
./duplex72: line 8: syntax error near unexpected token `fi'
./duplex72: line 8: `fi'
Oops, I forgot the second "then". As in

Code:
if [...]
then
    [...]
elif [...]
then
   [...]
fi

EDIT: Also, I bet the second echo is gonna throw an error when trying to print the exclamation marks. Use single quotes instead.
# 7  
Old 03-25-2013
Quote:
Originally Posted by verdepollo
Oops, I forgot the second "then". As in

Code:
if [...]
then
    [...]
elif [...]
then
   [...]
fi

EDIT: Also, I bet the second echo is gonna throw an error when trying to print the exclamation marks. Use single quotes instead.
That worked like a charm, thanks!!!
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