Concatenate string and txt file

Question

How do you concatenate a string to a text file in batch file? Example: I have a text file - cdrom.txt with this output:

Caption                  SerialNumber      Size          
SMI USB DISK USB Device  AA00000000000485  15825438720   
Hitachi HTS547550A9E384  2J1100159GVPAZ    500105249280

I need to put a label at the topmost of the line so that it would look like this:

CDROM
Caption                  SerialNumber      Size          
SMI USB DISK USB Device  AA00000000000485  15825438720   
Hitachi HTS547550A9E384  2J1100159GVPAZ    500105249280

i tried type CDROM cdrom.txt >> cdrom.txt but it has a wrong syntax — user352156, Feb 25 '15 at 06:01
possible duplicate of [Append text with .bat](http://stackoverflow.com/questions/5139157/append-text-with-bat) — CinCout, Feb 25 '15 at 06:08

score 0 · Answer 1 · answered Feb 25 '15 at 06:16

0

How about:

ren cdrom.txt cdrom.tmp
echo CDROM > cdrom.txt
type cdrom.tmp >> cdrom.txt
del cdrom.tmp

answered Feb 25 '15 at 06:16

Monacraft

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it says it cannot find the file specified @monacraft – user352156 Feb 25 '15 at 06:40

codeBreath · Answer 2 · 2015-02-25T09:00:44.773

Chevron > characters provide redirection in windows command processor. So, to write a string to somefile.txt, we write:

echo myString > somefile.txt

executing this command writes a new file each time, due to the single > (write redirection).

Using a double chevron >> appends the prefix text to the file instead. So the command:

echo myString2 >> somefile.txt

would append myString2 to the somefile.txt file, usually on a new line, since the command processor prefixes a newline (Windows style CRLF) to the prefix of the >> operator before writing it out to the file.

Building on this, your specific case would lead to :

echo CDROM > cdrom1.txt
type cdrom.txt >> cdrom1.txt
del cdrom.txt
ren cdrom1.txt cdrom.txt

If you'd like more fine-grained stream redirection, you'll need to read up more :P

Look here

Concatenate string and txt file

2 Answers2