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.
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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. 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.
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Not available on all platforms. Same as File::stat , but does not follow the last symbolic link.
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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 ::utime. Returns the number of file names in the argument list. Opens the file named by filename according to the given mode and returns a new File object. See IO.
The puts Statement
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.
Ruby - File I/O
If a file is being created, its initial permissions may be set using the perm parameter. See ::new for further discussion. Note : Ruby is a scripting language. There is no special main method in Ruby from which execution begins. The Ruby interpreter is given a script of statements to execute, and it begins executing at the first line and continues to the last line.
How to Create Temporary Files in Ruby
Parentheses are usually optional with a method call. These calls are all valid: foobar foobar foobar a, b, c foobar a, b, c b. In Ruby, everything from an integer to a string is considered to be an object more on this later. And each object has built in 'methods' Ruby term for functions which can be used to do various useful things.
To use a method, you need to put a dot after the object, and then append the method name. Some methods such as puts and gets are available everywhere and don't need to be associated with a specific object.
Another thing that you'll probably want to do at some point is to access the variables that were passed to your script from the command line. For instance, if you ran:. You've passed in "howdy" and "everyone". You access these inputs by digging into a special constant which is a variable you shouldn't try to change called ARGV. ARGV is simply an array that contains all your command line arguments:. As you can see in the last example above, you can only pass in command line arguments from the actual command line not within IRB.
There is a trick you can sometimes use to check whether your script is being run from the command line or as part of a larger program instead. You might do so if you want to puts some stuff only if it's called from the CLI to debug it maybe. Despite learning all those options, there's one which is particularly easy. Most modern text editors have the options to "build" or run your code right in the editor.
Class: File (Ruby )
The specifics of how to do so are just a Google search away for your particular editor. There are a number of different ways to run your Ruby scripts and it's good to give each of them a try before you settle on one as your "go-to". A little bit of investment in learning these things can quickly add up to minutes and even hours of time. There are additional resources for this lesson.