In Linux you can use split and join commands to split large files into smaller files or join many smaller files into a large file. This kind of operations are often necessary when you are dealing with large quantities of data.
Following is the default functionality of split. It splits a large file every thousand lines and creates new files.
$ split largefile.txt $ ls largefile.txt xaa xab xac xad $ wc -l * 3285 largefile.txt 1000 xaa 1000 xab 1000 xac
You can also define the number of lines you want in each file