Lets say that we have one big file and want to split it into 10M parts.
$ ls -lh razem 44M -rw-r----- 1 milosz milosz 44M 2011-02-27 16:28 file.png
To divide file into smaller parts we will use split command.
$ split -d -b10M file.png file1.part $ ls -lh razem 87M -rw-r--r-- 1 milosz milosz 10M 2011-02-27 16:39 file1.part00 -rw-r--r-- 1 milosz milosz 10M 2011-02-27 16:39 file1.part01 -rw-r--r-- 1 milosz milosz 10M 2011-02-27 16:39 file1.part02 -rw-r--r-- 1 milosz milosz 10M 2011-02-27 16:39 file1.part03 -rw-r--r-- 1 milosz milosz 3,3M 2011-02-27 16:39 file1.part04 -rw-r----- 1 milosz milosz 44M 2011-02-27 16:28 file.png
You can merge them in a couple of different ways.
$ cat file1.part0{0,1,2,3,4} > file_m.png
$ diff file.png file_m.png
$
$ ls -1 file1.* | sort | xargs cat > file_m2.png $ diff file.png file_m2.png $
$ cat file1.part0* > file_m1.png $ diff file.png file_m1.png $