Ruby append file mode

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Learn more. Asked 12 years, 3 months ago. Active 6 years, 1 month ago. Viewed 51k times. Improve this question. Josh Voigts 3, 1 1 gold badge 16 16 silver badges 40 40 bronze badges. Just a learner Just a learner Add a comment. Active Oldest Votes. The file pointer will be at the beginning of the file. Raises an exception on any error. Since the underlying implementation relies on the unlink 2 system call, the type of exception raised depends on its error type see linux.

Returns true if the named file is a directory, or a symlink that points at a directory, and false otherwise. Returns true if the named file is executable by the effective user and group id of this process. See eaccess 3. Windows does not support execute permissions separately from read permissions.

On Windows, a file is only considered executable if it ends in. Returns true if the named file is executable by the real user and group id of this process. See access 3. A more complex example which also resolves parent directory is as follows. Returns the extension the portion of file name in path starting from the last period.

If path is a dotfile, or starts with a period, then the starting dot is not dealt with the start of the extension. An empty string will also be returned when the period is the last character in path. If the file argument is a symbolic link, it will resolve the symbolic link and use the file referenced by the link. Returns true if path matches against pattern. The pattern is not a regular expression; instead it follows rules similar to shell filename globbing.

It may contain the following metacharacters:. Matches any file. Can be restricted by other values in the glob. Matches any one character in set. Behaves like a Regexp union?

The same glob pattern and flags are used by Dir::glob. Returns true if the named file exists and the effective group id of the calling process is the owner of the file. Returns false on Windows. Equivalent to File::chmod , but does not follow symbolic links so it will change the permissions associated with the link, not the file referenced by the link.

Often not available. Equivalent to File::chown , but does not follow symbolic links so it will change the owner associated with the link, not the file referenced by the link. Returns number of files in the argument list. Creates a new name for an existing file using a hard link. Not available on all platforms. Same as File::stat , but does not follow the last symbolic link.

Instead, reports on the link itself. Sets the access and modification times of each named file to the first two arguments. If a file is a symlink, this method acts upon the link itself as opposed to its referent; for the inverse behavior, see File. Returns the number of file names in the argument list. Returns the modification time for the named file as a Time object. Opens the file named by filename according to the given mode and returns a new File object.

See IO. If a file is being created, permission bits may be given in perm. These mode and permission bits are platform dependent; on Unix systems, see open 2 and chmod 2 man pages for details. The new File object is buffered mode or non-sync mode , unless filename is a tty. With no associated block, File. If the optional code block is given, it will be passed the opened file as an argument and the File object will automatically be closed when the block terminates.

The value of the block will be returned from File. Are you certain that mode: 'a' is required? This is of course IO::write. Third argument can be omitted, will default to the end of the file. Rustam A. Gasanov Rustam A. Gasanov I should have asked "simpler way" not "without block".

It seems like there is no way like File write. I'll accept your answer. It is just my opinion that this way is most readable, easy and doesn't require block. Gasanov I see, I've changed the title. Thanks for heads up. Thai Thai 9, 1 1 gold badge 37 37 silver badges 50 50 bronze badges.

This will add a new line at the end of each line it writes. The following code shows you how to use the gets statement. This code will prompt the user to enter a value, which will be stored in a variable val and finally will be printed on STDOUT.

Unlike the puts statement, which outputs the entire string onto the screen, the putc statement can be used to output one character at a time. The print statement is similar to the puts statement. The only difference is that the puts statement goes to the next line after printing the contents, whereas with the print statement the cursor is positioned on the same line. Until now, you have been reading and writing to the standard input and output.

Now, we will see how to play with actual data files. You can create a File object using File. Finally, you can use File. You can use File. However, there is one difference in between File. The difference is that the File. Read-only mode. The file pointer is placed at the beginning of the file. This is the default mode.

Write-only mode. Overwrites the file if the file exists. If the file does not exist, creates a new file for writing.