Shell Programming and Scripting

Hi.

I have 50nodes connected together and i can do rcp,rsh on those nodes and using home grown application i can execute command parallelly on all nodes at a time.
Now my question is i want to replace one field in one file on all nodes. The file and field exists on all nodes but the contents of the file or not same on all nodes.
Can some one please help me with some script.
example,
/etc/passwd file exists on all nodes and "bin" user exists on all nodes. what i want to do is locate user "bin" in all nodes and replace it with "binuser"

Hmm, you'd basically use sed to change the commands, write to a temporary file and then copy the temporary file back over the first file. Lots of problems with that though. Permissions and owerships being top on my list. Error checking to make sure the temporary file is complete. In the case of the /etc/passwd file, blocks in place to keep someone from changing it while you're doing it.

But you said you have an app on each node so you just need the command. Easy enough:

Code:

sed -e "s/^bin:/binuser:/" /etc/passwd

You'll have to write the output to that temporary file I mentioned or it'll just display to the tty/console.

Carl