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replace a specific text in a text file

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roswell

roswell

Programmer
Mar 18, 2001
26
PH
Does anybody knows how to replace a text in a text file? Meaning finding a word in the file, then changing it with a new word and saving that text file. Example, I would like to change the password in the text file under a specific username. How could I do this?
Thanks in advance.
 
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