console automation - Expect

Today is time for some examples of Expect (extension of Tcl/Tk) scripts that I use almost daily. The most common usage scenarios are:

- automating common login (never do this unless you don't care about the passwords aka lab passwords for machine that will be wiped anyway),

- adjusting the remote environment to your needs without the modifying permanently any files on the remote machine (for example because it will be rebuild from scratch next day),

- running tests and verifying results (like running a command waiting sometime and verifying if you got the result you wanted, repeating the whole sequence 1000 times or until the result is reached),

- running some macros while in the interactive mode,

All of those things can be found combined in those two scripts (link1, link2).

All the scripts, including few a bit more specialized, can be found here.

gnuplot - plot from a pipe/stdin

EDITED TO ADD: I have no idea how I missed this, you can just use "plot '-'" as mentioned in the comments. This proves that my searching skills suck.

This is not rocket science but I couldn't find it (yeah I know my searching foo sucks) on the Internet (aka Google nowadays).


So just to make a note if I would forget about this and I would want again to create plots from some data without putting it into file:

huge_one_liner_goes_here | gnuplot -p -e 'plot "< cat /proc/$$/fd/0"'

A small script I created that adds a bit more options can be found here.

A great page with examples is here. Two nice blogs, first one has been quiet since some time, the second one looks active.