Split linux file

0. Create a test file

[root@jmlab ~]# head -c 19MB /dev/urandom > jmtest1.txt
[root@jmlab ~]# pwd
/root

1.  check the size of current file

[root@jmlab ~]# ls jmtest1.txt
jmtest1.txt
[root@jmlab ~]# du -sh jmtest1.txt
19M     jmtest1.txt

2. check the file checksum

[root@jmlab ~]# md5sum jmtest1.txt
b06b3a95f8306b9a52390ede0e701e44  jmtest1.txt

3. split file into 5mb site

[root@jmlab ~]# split -b 5M  jmtest1.txt jmtest1_

4. check the files and upload



[root@jmlab ~]# ls -lrt jmtest1_*
-rw-r--r-- 1 root root 5242880 Apr 14 06:48 jmtest1_aa
-rw-r--r-- 1 root root 5242880 Apr 14 06:48 jmtest1_ab
-rw-r--r-- 1 root root 5242880 Apr 14 06:48 jmtest1_ac
-rw-r--r-- 1 root root 3271360 Apr 14 06:48 jmtest1_ad


 5. Marge file (Give this command to receiving person)

[root@jmlab ~]# cat jmtest1_* > jm1.txt


6. validate checksum

[root@jmlab ~]# md5sum jm1.txt
b06b3a95f8306b9a52390ede0e701e44  jm1.txt
[root@jmlab ~]#