Printf to file handle

Likewise, each method has its own attributes and properties for showing its results as much as needed from the user perspective. In Perl, the printf function used some format specifiers for displaying the outputs on the user screen. This is a guide to Perl printf.

Here we discuss the introduction; how does the printf function work in Perl? You may also have a look at the following articles to learn more —. Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? How to write to a file using open and printf? Ask Question. Asked 5 years, 11 months ago. Active 1 year, 10 months ago. Viewed 30k times. Improve this question.

R Sahu k 13 13 gold badges silver badges bronze badges. I have to use printf — user You can use fopen to open a file and then use fprintf and other functions from the standard library to write to the file. It can be tricky to get the correct set of flags the first time you try it. Show 1 more comment. Active Oldest Votes. There's a trick to this. Improve this answer. You should remove the close fd : exit or even just returning from main will cause stdout to be closed as if by fclose stdout , which will fflush stdout ;.

This step might be needed for the contents to be flushed to the file. Closing the system handle would prevent this. Add a comment. John Kugelman John Kugelman k 66 66 gold badges silver badges bronze badges. The assignment specifies using printf and open — user If FileHandle::open is given a numeric mode, it passes that mode and the optional permissions value to the Perl sysopen operator.

If dynamic loading is not available, this may fail, but the rest of FileHandle will still work. FileHandle::fdopen is like open except that its first parameter is not a filename but rather a file handle name, a FileHandle object, or a file descriptor number.

If the C functions fgetpos and fsetpos are available, then FileHandle::getpos returns an opaque value that represents the current position of the FileHandle, and FileHandle::setpos uses that value to return to a previously visited position. If the C function setvbuf is available, then FileHandle::setvbuf sets the buffering policy for the FileHandle. See perlfunc for complete descriptions of each of the following supported FileHandle methods, which are just front ends for the corresponding built-in functions:.