There are two files.
main_1.go reads the whole file into memory sorts the strings and breaks the file into smaller parts of 500kb
main.go reads the file by maxfilesize parts sorts the string and breaks it into smaller files of 500kb it repeats this whole process till it reads the whole file.
How to run
go run main.go --file ./test.txt
or
go run main_1.go --file ./test.txt
You can specify the max file size in mb using --maxfilesize 2 it has to be an integer it's not required as it already has a default of 1mb