Linux – Utility to send a command to multiple terminals

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A while ago when I did a lot more system admining, there was a little utility that would send a command to multiple terminals that I had open. So essentially I could ssh into three different servers, then type tail -f /var/log/some_error.log into the utility and it would pass that command onto all three terminals I had open.

So essentially I typed the command once, and it was run on all three servers. Plus the terminals were fully accessible to me so if I wanted to run commands just on that one server, I would just use the terminal ssh'ed into that one server.

After a ton of searching online, I've yet to find this utility (it was simply available on the machines we had and I can't recall the name of this particular utility). So does anyone know of any utilities that do this?

Thanks

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I believe you are searching for clusterssh. Love it!

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You can get a pretty good measure of this using the iostat tool.

% iostat -dx /dev/sda 5

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.78    11.03    1.19    2.82    72.98   111.07    45.80     0.13   32.78   1.60   0.64

The disk utilisation is listed in the last column. This is defined as

Percentage of CPU time during which I/O requests were issued to the device (band-width utilization for the device). Device saturation occurs when this value is close to 100%.

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There isn't any that I know of, but it theoretically shouldn't be hard to get something similar. Strace can be used to intercept networking syscalls.

# strace -f -e trace=network -s 10000 /usr/bin/command arguments

This will give you information about the data sent between the kernel and the process. The output of strace isn't exactly what you'd want. However, strace uses the ptrace syscall to intercept system calls. It might be possible to write a program to output the data a little more usefully.

Alternatively, you can also intercept the nice useful socket, bind and listen syscalls. It might be possible to write a small program that used ptrace on these calls and libpcap to dynamically change the capture filter every time a new socket is opened.

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