i want to use a script to change text in build.prop
the script has to look for:
ro.something: (text to change)
and change the (text to change)
One way would be to make use of the sed command in a script, coupled with other commands such as grep you can search for the property you want and replace the values of it once you find the property your looking for. I would recommend taking a look at the sed documentation, as well as this tool which does something similar to what you want to do.
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