remote execution

Shell Programming and Scripting
1

Hi everybody,
sorry if the question will be too trivial for some of you, but I'm not a unix shell programmer expert.
I need to write a script that allows me to rlogin to another machine, check the load (cpu and mem usage) of the new machine, start a process (that will run in the background) and logout.
If I try:

rlogin new-machine
cd path/
...

after the rlogin, it will execute the 'cd' command locally instead of remotely. How can I make the script to execute the commands after the rlogin remotely?
How can I check the machine load?

Please let me know if my approach is completely wrong.

Many thanks in advance,
Carmelo

2

rsh or remsh may work better for you. Check out the man pages. From your description, a cron job may even work for you. The cron job would check the load and start the process.

I don't know which specific load information you are looking for but uname -a or sar may give you what you want.

3

You can use uptime to find out system load. Also if you want to determine the load based on the current CPU usage you may try

sar -u 1 1|/usr/xpg4/bin/grep -E ':'|grep -v usr|awk '{print $2+$3}'

Thus will print the sum of user and kernel % CPU usage

4

Hi,
thanks for your reply. I've used the 'rsh' command without problem. Regarding the 'sar' command, I don't have it. I had a look on the web and after I found it, I couldn't complete the installation because it complained about root permissions which I don't have. Is there any other way to install it? Or is it possible to use something else? What about uptime? I don't understand the values of load average in terms of what they are expressed. I just need the percentage of CPU usage, which it doesn't seem to give.

Thanks,
Carmelo

5

Sorry I forgot to say, if can be useful, that I'm using a Linux box with red-hat 7.3.

Thanks
Carmelo

6

Try man uptime
the system load averages for the past 1, 5, and 15 minutes.

Also you can get the %CPu usage using top, iostat and ps also.