The "Copy /b" command on cmd

[Guest Becquer]

I can merge two files by typing on the cmd(without the [] and the "") :

 

"copy /b [file1name] + [file2name] [targetfilename]"

 

Where [file1name] and [file2name] are the name of the two files I want to

merge and [targetfilename] is the result file where i want they to mergre in.

 

But, how can I "unmerge" the result file into the original files?

[Guest Pegasus \(MVP\)]

Re: The "Copy /b" command on cmd

 

 

"Becquer" <Becquer@discussions.microsoft.com> wrote in message

news:8EC4D24C-8F75-4C9C-8A2E-2401A0E4F766@microsoft.com...

>I can merge two files by typing on the cmd(without the [] and the "") :

>

> "copy /b [file1name] + [file2name] [targetfilename]"

>

> Where [file1name] and [file2name] are the name of the two files I want to

> merge and [targetfilename] is the result file where i want they to mergre

> in.

>

> But, how can I "unmerge" the result file into the original files?

>

 

The two (or more) files are merged seamlessly. Unless you add

a marker (see below), you cannot unmerge them.

 

echo ================== > marker.txt

copy /b file1.txt + marker.txt + file2.txt file3.txt

[Guest HeyBub]

Re: The "Copy /b" command on cmd

 

Becquer wrote:

> I can merge two files by typing on the cmd(without the [] and the "")

> :

>

> "copy /b [file1name] + [file2name] [targetfilename]"

>

> Where [file1name] and [file2name] are the name of the two files I

> want to merge and [targetfilename] is the result file where i want

> they to mergre in.

>

> But, how can I "unmerge" the result file into the original files?

 

Slight correction: the files are not "merged." They are "concatenated."

 

The "/b" switch implies the files are binary files, NOT text files, that

they should be copied in their entirety rather than the copy process

quitting at the first end-of-file marker.

[Guest Alan]

Re: The "Copy /b" command on cmd

 

Hi Becquer,

 

If I wanted the ability to go back to each separate file, I would make a

copy of each file before concatenating to the target file.

 

Alan

 

"Becquer" <Becquer@discussions.microsoft.com> wrote in message

news:8EC4D24C-8F75-4C9C-8A2E-2401A0E4F766@microsoft.com...

>I can merge two files by typing on the cmd(without the [] and the "") :

>

> "copy /b [file1name] + [file2name] [targetfilename]"

>

> Where [file1name] and [file2name] are the name of the two files I want to

> merge and [targetfilename] is the result file where i want they to mergre

> in.

>

> But, how can I "unmerge" the result file into the original files?

>

[Guest Patrick Keenan]

Re: The "Copy /b" command on cmd

 

"Becquer" <Becquer@discussions.microsoft.com> wrote in message

news:8EC4D24C-8F75-4C9C-8A2E-2401A0E4F766@microsoft.com...

>I can merge two files by typing on the cmd(without the [] and the "") :

>

> "copy /b [file1name] + [file2name] [targetfilename]"

>

> Where [file1name] and [file2name] are the name of the two files I want to

> merge and [targetfilename] is the result file where i want they to mergre

> in.

 

As noted, this concatenates, not merges. There can be a difference.

> But, how can I "unmerge" the result file into the original files?

 

You can't, using these utilities. And the original files still exist.

 

If you want to split files, use a file split utility. If you want to

reproduce the original sizes, you have to know exactly where the

concatenation occurred and specify that for the split.

 

HTH

-pk