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I need to replace the line in same file not in new file or not to append.....

Ex:
my file :

1 is one
2 is two
3 is three

If i use "sed '/2/s/two/twoTWO/g' >> my file" thn "my file"...

Can you please guide me, with the same

i would like to quickly clarify the reqt once again

eg:

source file will be like
=================

99999999999 maximum number(0)
ksuisikjjsl;;l skjss''llsl(0)
minimum number 0000000(0)...

The requirement needs to be done in run time.

Note : I have a previous task after the completion of the task the script needs to be kicked off and the changes needs to be made in the file.
...

how to change a particular value in a line of a file based on a pattern

eg:

source file will be like
=================

99999999999 maximum number(0)
ksuisikjjsl;;l skjss''llsl
minimum...