C Just Delete Some Part Of File

Question

I have two files. I want to copy source file to destionation file. If they are different, then I just want to copy different line not all file. In the below case, two line are same, but destination has extra line. How can I just delete last line of destination file?

For example:

Source File:

test1  
test2

Destionation File:

test1
test2  
test3

Do you need to program it in C, or is the end result all you need? If you don't care about the logic, then piping the files to the linux command uniq may be a good choice. — user12205
– user12205, Commented Oct 19, 2015 at 18:08
What about rewriting the file while excluding the missing section? — Jon Trauntvein
– Jon Trauntvein, Commented Oct 19, 2015 at 20:54

Basile Starynkevitch · Accepted Answer · 2015-10-19 18:04:45Z

4

On POSIX systems, if you want to delete some ending bytes in a file, you could use ftruncate(2)

There is no portable way to remove bytes in the middle of a file.

answered Oct 19, 2015 at 18:04

Basile Starynkevitch

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