Hi All,

I have a question about file concatenate on unix. I have two file
1 of them like aaa,bbb,ccc,ddd
other one is eee,fff,ggg,hhh

I want to concatenate those file like this position
aaa,bbb,ccc,ddd,eee,fff,ggg,hhh

how can I do this ??

thanks.
Alice

echo "`cat file_1`,`cat file_2`" > file_3

That solution will work if the two files contain only one line each. I know that is what Alice literally said, but she may be looking for a solution when her files contain multiple lines. So I would suggest paste:
paste -d, file1 file2 > file3

Assuming you run ksh or bash (and sh...I think)
try...

touch ./newfile
for fn in aaa bbb ccc ddd eee fff
do
cat $fn >> ./newfile
done