In unix (using solaris): how can I merge multiple file contents to a one singe file.?

In unix (using solaris): how can I merge multiple file contents to a one singe file. All of the mutiple files has 3 columns. I need to merge all files contents to a single file. Thanks

In unix (using solaris): how can I merge multiple file contents to a one singe file.?
cat file1 file2 file3 %26gt; output.file