Splitting a large File
During an online transfer of a large file, there are
often connection break-downs. The connection must be re-established and the
transfer process has to be started again, even if the major part of the file
has already been transferred.
A: Windows NT - HJ-Split (Freeware for Windows 95/NT)
By use of the application HJ-Split, a large file can be divided into several small
parts, transferred and re-combined to a large file. In the following, you will
find a short description of the individual program functions.
- Split
- Divides a large file into small parts. Click on
the button Split to reach
the next window.
- File Splitter
- Split file size (Kb):
<1400>
Enter
the size for the part files in KB here. If the parted files are to be
transported on floppy disks, the default value should be confirmed.
- File to split: <unknown>
Click
in the field with the word unknown.
The "Open" function of the NT-Explorer
will be activated. Select the drive and directory and highlight the file
to be split. Click on the button Open.
The name of the selected file will replace the word unknown.
- Start
After you have defined the size of the split files and
the file to be split, click on the Start button. The process will be
started, which is indicated by the message Working in the button Start.
When the process is complete, Ready
and - in another window - Splitting
Completed <OK> will appear. Click OK. The message Ready will change to Start again. The split files can be found in the directory in
which the original file is located. The split files receive a sequential
3-digit number added to the original file name.
- Hide
Click
on the button Hide to return
to the main menu.
- Join
- Combines the split files that have been
generated by use of the Split
function to the original file. Click on the button Join to reach the next window.
- File Joiner
- Requirement:
Before
you start Join, copy all
part files to be joined into an empty folder.
- Files to join <unknown>
Click
in this field, behind the word unknown.
The "Open" function of the NT-Explorer
will be activated. Select the drive and the directory to which you have
copied the part files. Highlight the file with the number 001.
(e.g.: NT971212.zip.001).
Click on the button Open. The name of the selected file
(incl. the path) will replace the word unknown.
In addition, the drive, directory and the name of the original file will
be displayed in the next parameter.
- Files to restore
If the
right file (e.g.: NT971212.zip.001)
has been selected in the previous parameter Files to join, this field will automatically display the
name and path of the original file.
- Start
After
you have selected the part file with the number 001, click on the Start button. The message Working will appear. When the process
is complete, Ready and - in
another window - Joining Completed
<OK> will appear. Click OK. The message Ready will change to Start again. The joined file can be found in the directory in
which the part files are located. The file name of the joined file will
be added by joined.
You can repeat this procedure for further files. In the field of the
parameter Files to join,
there is the note select a new file.
- Hide
Click
on the button Hide to return
to the main menu.
- Compare
- Compares two files and determines differences.
Click on the button Compare
to reach the next window.
- File 1 <unknown>
Click
in this field, behind the word unknown.
The "Open" function of the NT-Explorer
will be activated. Select the drive and the directory and highlight the
first file you would like to compare. Click on the Open button. The selected file,
including the path, will be displayed in the field File 1.
- File 2 <unknown>
Click
in this field, behind the word unknown.
The "Open" function of the NT-Explorer
will be activated. Select the drive and the directory and highlight the
second file you would like to compare. Click on the Open button. The selected file,
including the path, will be displayed in the field File 2.
- Start
Click
on the Start button after selecting the
required files. During the process, the Start
button will show the message Working.
After the process has been finished, a result message (e.g.: files are equal <OK>) will
appear in an additional window. Click on <OK>. The process can be repeated for further
files.
- Hide
Click
on Hide to return to the
main menu.
- Checksum
- Generates a checksum of a file. You should use
this function for every joined file and compare the result with the
checksum of the original file. By this, you can make sure that no errors
occurred during the transfer. Click on the button Checksum to reach the next window.
- FileName <unknown>
Click
in this field, behind the word unknown.
The "Open" function of the NT-Explorer
will be activated. Select the drive and the directory in which the joined
file is located. Highlight the file with the appendix joined (or the renamed original
file). Click on the Open
button. The name (incl. path) of the selected file will replace the word unknown.
- Start
Click
on the Start button after selecting the required
file. During the process, the Start
button will show the message Working.
After the process has been finished, the message Checksum ready <OK> will appear in a new window.
The calculated checksum will be in the field Checksum. This checksum has to be equal to that of the
original file.
- Hide
Click
on Hide to return to the
main menu.
- Exit
- Closes the program HJ-Split.
- Help
- A help is not provided by the author of HJ-Split.
B: UNIX
For spitting a file, use the following command:
The number 2 stands for the maximum part file size in
MB. This value can be changed if required.
The generated split files are called xaa, xab
...
In order to join them again, use the command:
- cat xaa xab ... > file name
MICROS Retail Deutschland GmbH
Salzufer 8
D-10587 Berlin
Germany