Shell Programming and Scripting

Hey guyz hw u all doing.
I need some help regarding "df -m".I have to check 10 servers thrice a day and have to make a text file.The only problem is I have to log into those 10 servers * 3 =30 times every time .Is there any way ,we can write a script that will automatically run on all 10 server( the command "df -m") and email the result to me ,instead of me logging into each server and run df-m.

Appreciate your help guys.. (by the way the username and password are same for all 10 servers)

--CK

I don't understand the issue.... Why not write a script and put a copy on each server under cron control to run 3 times a day and email you? You can even get the date in the subject......

Z=`date`
df -m | mail -s "From server X on $Z" youremailaddress

something like that... Quotes around email subject (the -s parm) have to be double quotes or the $Z will not be expanded....

That sounds reasonable..sometimes I have to see the logs as well if the disk usage is more.Wht I thought is if it is a script we can uncomment that part and run the script so tht the script will gather all logs as needed.sorry iam novice in unix , i dont know we can address this issue as well using cron or not.I really want to use a script than keeping in cron.

Really appreciate ur help guys.

--CK

You put those 2 lines into a script, and then you run the script (a copy on each server) with cron...

It sounds like you want some way to trigger these things, all 10 of them, from one place when ever you feel like it. That means you have to log-in to each server in turn and execute the command, etc. There is a unix utility called "rsh" (remote shell). You might want look at that, but I'm usually for the KISS principle.

You should learn Expect:
Expect - Expect - Home Page

It can automate interactive sessions

The only reasonable choice for your method would be generating ssh certificates for passwordless login with forced commands only (for security reasons). This would allow you tu run df -m on remote machines from your script without the need to enter password each time.

For disk usage monitoring you can also use plugins from nagios or net-snmp...