Overwritte last char in file

Question

I wanted to remove the last char in file and

Not writing a new file and rename it

Because the file will grow larger over time (From a 1 byte file to 1 GB file, increase by 1 byte over time (1000000000 rewrites cycle)) and the rewrite will damage the hard disk

I don't think there's a different way in c++. I don't know how Unix operator `>>` works, but assuming you're on a Unix system you could do `echo "" >> "filename` with `system` in c++. `>>` will append the char to the file, but I don't know if it rewrites it to be honest. — magicleon94, Sep 16 '17 at 09:26
Possible duplicate of https://stackoverflow.com/questions/9529027/c-delete-last-character-in-a-txt-file — Vinayak Singla, Sep 16 '17 at 09:34
@VinayakSingla Are copy file data and trunc file and then write the same data to the file damage the hard disk or not? — Khoo Hao Yit, Sep 16 '17 at 09:45
[truncate(2)](https://linux.die.net/man/2/ftruncate) (Unix/Linux-specific) — myaut, Sep 16 '17 at 09:49
Editing the title to end in "closed" is NOT the way to close a question. Please either delete the question, or make a suitable answer, or indicate the duplicate question. — Yunnosch, Sep 16 '17 at 11:03
@ArtemyVysotsky Please make an anwer from your comment, so that this a) becomes a Q/A instead of a Q/comment b) gets out of the list of unanswered questions. Sadly, this does not really otherwise qualify for a close-vote. — Yunnosch, Sep 16 '17 at 11:08
@Yunnosch Idk how to choose comment as answer so I said "closed" because this may be helpful to other people — Khoo Hao Yit, Sep 16 '17 at 11:33
You cannot choose a commen as an answer, that is why I often ask people to make their answering comment into a question. — Yunnosch, Sep 16 '17 at 11:43

score 0 · Accepted Answer · answered Sep 16 '17 at 11:29

0

You can use

en.cppreference.com/w/cpp/io/basic_ostream/seekp

answered Sep 16 '17 at 11:29

Artemy Vysotsky

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Overwritte last char in file

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