Read downloaded file ruby

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These mode and permission bits are platform dependent; on Unix systems, see open 2 for details. Returns true if the named file exists and the effective used id of the calling process is the owner of the file. Returns true if the named file is readable by the effective user id of this process. Renames the given file to the new name. Raises a SystemCallError if the file cannot be renamed. Splits the given string into a directory and a file component and returns them in a two-element array.

See also File::dirname and File::basename. Raises a NotImplemented exception on platforms that do not support symbolic links. Returns the current umask value for this process. If the optional argument is given, set the umask to that value and return the previous value. Umask values are subtracted from the default permissions, so a umask of would make a file read-only for everyone.

Sets the access and modification times of each named file to the first two arguments. Returns the number of file names in the argument list. Returns true if the named file is writable by the effective user id of this process.

Actual effects are platform dependent; on Unix systems, see chmod 2 for details. Follows symbolic links. Also see File lchmod. Changes the owner and group of file to the given numeric owner and group id's. See also File lchown. Returns the change time for file that is, the time directory information about the file was changed, not the file itself. Same as IO stat , but does not follow the last symbolic link. Truncates file to at most integer bytes. The file must be opened for writing.

Home Core 1. Higher-order bits may also be used to indicate the type of file plain, directory, pipe, socket, and so on and various other special features. If the permissions are for a directory, the meaning of the execute bit changes; when set the directory can be searched.

On non-Posix operating systems, there may be only the ability to make a file read-only or read-write. In this case, the remaining permission bits will be synthesized to resemble typical values. The only change that can be made is to make the file read-only, which is reported as Various constants for the methods in File can be found in File::Constants.

Converts a pathname to an absolute pathname. If the platform doesn't have birthtime, raises NotImplementedError. Actual effects are operating system dependent see the beginning of this section. On Unix systems, see chmod 2 for details. Returns the number of files processed.

Changes the owner and group of the named file s to the given numeric owner and group id's. Only a process with superuser privileges may change the owner of a file. The current owner of a file may change the file's group to any group to which the owner belongs. A nil or -1 owner or group id is ignored. Returns the change time for the named file the time at which directory information about the file was changed, not the file itself.

Deletes the named files, returning the number of names passed as arguments. 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. 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. Have you ever needed to download and save an image in your Ruby application?

Read on to find out how. The most popular way to download a file without any dependencies is to use the standard library open-uri. Kernel open is a method that you can use to open files, streams, or processes to read to or write from. For example, you can open a file and read its contents with the following code:. We can use this to download an image and then save it as a file.

To do so, we first require open-uri then use the open method to access an image URL. We can then open up a file and write the contents of the image to the file. Open up IRB and try the following:. This is a success, but this was a straightforward example. In practice you would want to handle potential errors, such as a error for a missing image. Plus, there's a bunch of other potential issues with using open-uri. The thing is, using open-uri like this is not ideal.

First up, the above code is not very memory efficient, it loads the entire image into memory and then writes to disk.