[R] Reading many files at once

[Srinivas Iyyer]

dear group, 
 
i have 100 files starting with 'hsa-*'.

ex. file:

fruit   p-value 
------------
apple  0.0003
orange 0.004
kiwi   0.0003
peach  0.0004



I want to read all these files and create a single
matrix. here each file may have different fruit names.
 
in the matrix i want to have a union of all fruits and
those should be the rows in the matrix and file names
should be columns. 

ex;
        hsa-1   hsa-2  hsa-3  hsa-4  hsa-5
apple   0.003   0.01   0.002   0.002  0.002
orange  0.003   0.01   0.002   0.002  0.002
kiwi    0.003   0.01   0.002   0.002  0.002
peach   0.003   0.01   0.002   0.002  0.002
banana  0.003   0.01   0.008   0.002  0.001
plum    0.003   0.01   0.009   0.002  0.005
mango   0.003   0.001  0.002   0.002  0.008

 
could any one help me please.  

thank you.