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How to open a file and edit its content in groovy script

I have a Makefile in my Jenkins job's workspace, that I want to edit out certain parts from and then save it, before running next part of the script that uses this Makefile.
~~the part that I want to cut out is this-~~
~~`PUMP_MARKER:=,cpp~~
ifneq (,$(findstring $(PUMP_MARKER), $(DISTCC_HOSTS)))
PUMP:=pump
else
PUMP:=
~~endif`~~
~~I am looking for some shell command that I could put in my groovy script, that will open up this file and remove this above mentioned part, save it and then move on.~~
~~I'm not good with shell so I cant possible figure this out on my own.~~
~~Here is how my groovy script looks like-~~
~~`stage('Build'){`~~
~~`dir ("$WORKSPACE/$SVN_TAG") {`~~
Here- I want to insert some shell command to edit that file out
~~`}`~~
~~`}`~~
~~Could any please suggest some ideas to implement this.~~
Note- I know I could just vi that file and manually do this but I want to do this for multiple jobs and I'm genuinely looking for something that I can just paste in my every groovy script and automatically do this.

I have a Makefile in my Jenkins job's workspace, that I want to edit out certain parts from and then save it, before running next part of the script that uses this Makefile.
The part that I want to cut out is this:
```
PUMP_MARKER:=,cpp
ifneq (,$(findstring $(PUMP_MARKER), $(DISTCC_HOSTS)))
PUMP:=pump
else
PUMP:=
endif
```
I am looking for some shell command that I could put in my Groovy script, that will open up this file and remove this above mentioned part, save it and then move on.
Here is how my Groovy script looks like:
```groovy
stage('Build'){
dir ("$WORKSPACE/$SVN_TAG") {
Here- I want to insert some shell command to edit that file out
}
}
```
Note: I know I could just `vi` that file and manually do this but I want to do this for multiple jobs and I'm genuinely looking for something that I can just paste in my every Groovy script and automatically do this.

jenkins shell computer-science devops groovy

jenkins shell groovy

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