sequencially merge multiple files in a folder

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Ping-Hsun Hsieh
Sent: Monday, November 17, 2008 10:38 PM
To: r-help at r-project.org
Subject: [R] sequencially merge multiple files in a folder




Dear all,

If the question is too easy, please forgive me since I am only few
weeks old in R.

I have worked on this question a  few days and still cannot figure it
out.
Here I have a folder with more than 50 tab-delimited files. Each file
has a few hundreds of  thousands rows/subjects, and the number of
columns/variables of each file varies.The 1st row consists of all the
variable names.

Now I would like to merge all the files into one tab-delimited file by
a common column named "Ident"
Is there any good way to sequencially merge all of them together?
Here when I say  "sequencially" I mean merging file_1  and file_2
first and then merge the resulting data frame and file_3, and keep
going on and on till all files are merged.

If it is too complicated to do, merging all files together without the
specified order is also an acceptable alternative.

Here I am using R version 2.7.2 (2008-08-25) and x86_64-unknown-linux-
gnu.

Thank you for any advice and help!

PingHsun