UNIX for Dummies Questions & Answers

oh, then you should take the email part out of the loop.

#!/bin/sh

for a in `cat ipaddresses`
do
#write error to log for checking
/usr/sbin/ping $a|grep -ic alive 2> error.log
done

#the following determines the previous action with error or not.
#-s for checking error.log size, if no error, then it will be empty.
if [[ -s error.log ]];
then
mail jshwood <<!!!
done with error
!!!
else
mail jshwood <<@@@
all success
@@@
fi

would it help if I told you it was Solaris 8

Its just send one e-mail all the time "all succes"

I also had to take one set of [] out to get it to work does that have anything to do with it? the code now looks like


#!/bin/sh

for a in `cat ipaddresses`
do
#write error to log for checking
/usr/sbin/ping $a|grep -ic alive 2> error.log
done

#the following determines the previous action with error or not.
#-s for checking error.log size, if no error, then it will be empty.
if [ -s error.log ];
then
mail jshwood <<!!!
done with errors
!!!
else
mail jshwood <<@@@
all success
@@@
fi


PS thanks for the comments they are really helpfull for learning! the -s does that automaticly check the size of the file?
Regards
Jonathan

About the [[ or [, because I always write korn shell rather than bourne shell.

Yes, -s is one of option of 'if'. You can type man if or man sh to know more.

I think the error.log may useful for you so I added these statement for you. If it is zero size that mean no error write to log. The log is used for your reference and more easy to write the script to determine different action.

Cheers!

is there another way that you know of with out using grep cause I don't think it's a good way personally cause you are looking for one specific thing!

Please keep messages about a specific problem together in the same thread. Also, use your man pages instead of just getting someone to give you answers.

You need to look at the man page for "sh" or "if". You don't have the correct syntax. Good examples of sh scripting might be found in your startup files (/etc/rc2.d on Solaris - S69inet would be one with if - then -else - fi statements)

if
/usr/sbin/ping $a|grpe -ic alive
break
else
mail "email address" <<!!!
message
!!!
fi

I tried my posted before and found a error. It is no output to log from the grep although it can't get any pattern. So the solution is:

You can do it more simply

#!/bin/sh

for a in `cat ipaddresses`
do
#write log or not just depend on you
#Actually no need to use grep, because ping also has its return code. you can type echo $? to see it after type ping anyip. 0 usually means ok and 1 means fail. You can also use it if [ $? -eq 0 ] to determine the action. Anyway, you should type 'man if' first.

if /usr/sbin/ping $a
then
# ":" means do nothing, you may type any command you like. If you only want to know the fail one then just follow it.
:
else
mail jshwood << !!!
$a not accessible!
!!!
fi
done


The mailbox will receive the message like:
xxx.xxx.xxx.xxx or hostname not accessible!

Cheers!

Ta for all your help this is the code and it works more amzingly!

#!/bin/sh

for a in `cat /export/home/jshwood/ip/ipaddresses`
do
/usr/sbin/ping $a
leave=$?

if [ $leave -eq 1 ]; then
exit
fi
done

mailx -s "IPadresses" jsherwood@phoenixmedical.co.uk <<!!!
IP addresses taken
!!!

Thanks though really apreciated it!
apparently you can use an awk command to do it aswell so I am gonna work that one out well hopefully!
Regards
Jonathan