edit columns in unix shell script

i have a file which if you will open as xls will yield something like this:

Column1 Column2 Column3
ABC CDE EFG
GHI IJK KLM
MNO OPQ QRS

what i want to need is to have this kind of results:

Column1
ABC CDE EFG
GHI IJK KLM
MNO OPQ QRS

and delete the other two columns.

Thanks!

what have you tried?

so want those column2 and column3 header to be removed??

actually, i just used "column1", "column2" and "column3" to show that the original file is in columns. yes, after joining the text in one column, delete the other columns

joining in the sense?? they are space seperated right??
just print the column1 in first line and the print rest below that that will looks like your o/p

im sorry, but i did'n get that "just print the column1 in first line and the print rest below that that will looks like your o/p".

I mean this..

awk 'BEGIN{print "column1"}NR>1{print}' filename

thanks! im so happy i got to know this site!

yes we are here to help you out..
but please post what have you tried along with the question..
I mean please show your effort towards that..

im sorry... ill keep that on mind.. unix is very new to me. im starting to learn it.. Thansk again!

---------- Post updated 06-23-09 at 07:48 AM ---------- Previous update was 06-22-09 at 04:52 PM ----------

hi! regarding this problem... what if i want to edit it the other way?

FILE 1
COLUMN1
ABC DEF
GHI JKL
MNO PQR

i want to make it as:
COLUMN1 COLUMN2
ABC DEF
GHI JKL
MNO PQR

Thanks!

---------- Post updated at 07:49 AM ---------- Previous update was at 07:48 AM ----------

there will be two columns now.

What about...

awk 'BEGIN{print "column1,column2"}NR>1{print $1 "," $2}' filename