[R] simple time series plot

[phibo]

I'm an absolute R newbie, but my question is (or at least seems) simple:

I have a number of sensor values from different sensors, along with
timestamps, so something like this:

sensor 1:
read_at:    1     2     4     5     6
value:        1   15     8    15  23

sensor 2:
read_at:    2    3     4     6     7
value:       10  11    7    12  28

what I need is a line plot of the sensor values, aligned given their
timestamps (it's in unix epoc time).

which data structure should i use? can i import from CSV file? how should I
format that data file?

which commands do I need to get the plot? is there a simple tutorial (didn't
find any).

how would you solve this?

THANKS a lot!

phibo

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