#split -b 650m file filebak_

# ls -lh
            total 4.0G
            drwxr-xr-x 2 root root 200 Jul 3 00:50 .
            drwx------ 12 root root 624 Jul 3 00:51 ..
            -rw-r--r-- 1 root root 2.0G Jul 3 00:35 file
            -rw-r--r-- 1 root root 650M Jul 3 00:49 filebak_aa
            -rw-r--r-- 1 root root 650M Jul 3 00:50 filebak_ab
            -rw-r--r-- 1 root root 650M Jul 3 00:50 filebak_ac
            -rw-r--r-- 1 root root 50M Jul 3 00:50 filebak_ad

#cat filebak_a* > ./file

#./knife -c file 681574400

# ls -l
            total 4100028
            drwxr-xr-x 2 root root 272 Jul 3 01:21 .
            drwxr-xr-x 3 root root 104 Jul 3 01:13 ..
            -rw-r--r-- 1 root root 2097152000 Jul 3 00:35 file
            -rw-r--r-- 1 root root 681574400 Jul 3 01:18 file.k00
            -rw-r--r-- 1 root root 681574400 Jul 3 01:19 file.k01
            -rw-r--r-- 1 root root 681574400 Jul 3 01:21 file.k02
            -rw-r--r-- 1 root root 52428800 Jul 3 01:21 file.k03
            -rwxr-xr-x 1 root root 12949 Feb 28 2000 knife

#./link file file.k00 file.k01 file.k02 file.k03

Please intput the file name you want to LINK up, one by one.
            Just input OK when you have finished inputting. In this order:

Now it's time you type the name of the output file.
            →file