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I tried that b4 writing to memory but it didnt work for me.. what i want is not to change the file. let say i have this input.txt file i want the changes to occur in that particular file not in...

I have a text file with this format:

aaa:bbb:ccc
ddd:eee:fff
ggg:hhh:iii

so now i want to search for fff and replace it with kkk but in same file. i know how to do by pasting stuff in other...