How to edit .txt file by batch file?

[Mohammad_Dos]

Hi
I use this command for creat a text file in dos:

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copy con c:\hi.txt

and then I enter the text and press:

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Ctrl+z

for save

or

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echo Hi>c:\hi.txt

echo I am mohammad>>c:\hi.txt[/code]


and for display it:

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type c:\hi.txt

My Questions:
how to edit created file and remove some of texts from it?
is exist more commands for creat a text file?