Alter a line in a file.

Hi all R users

Ive got a file that contains diffrent settings in the manor of:

setting1="value1"
setting2="value2"
setting3="value3"
setting4="value4"
.
.
.

What I want to do is open the file and change the value of a specific
setting
like wanna change setting4="value4" -> setting4="value5" and then save the
file again.

setting1="value1"
setting2="value2"
setting3="value3"
setting4="value5"
.
.
.




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