Ruby File Open Relative Path

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Ruby file open relative path. The value of the block will be returned from file open. Ruby provides a whole set of i o related methods implemented in the kernel module. As noted by theo in this stackoverflow post file expand path is used to get the absolute path when the relative path is known i think file expand path is somewhat antiquated now that require relative exists but it is work studying a rails still uses it. By default the yielded pathnames will have enough information to access the files.

When a rails application is initialized the file expand path method is used in the config and script directories as well as the rakefile. Relative paths are referenced from the current working directory of the process unless dir string is given. All the i o methods are derived from the class io. Example to read from a file open a file and read from it file open test1 rb r do f1 while line f1 gets puts line end end f1 close.

If a file is being created its initial permissions may be set using the perm parameter. It yields pathname object for each child. Expand path ruby usr bin usr bin ruby a more complex example which also resolves parent directory is as follows. Using the require method.

The command to close an open file is. Expand path ruby usr bin. Suppose we are in bin mygem and want the absolute path of lib mygem rb. If you enter the command properly you will get the result nil.

Iterates over the children of the directory files and subdirectories not recursive. To learn a few other basic file manipulation functions in ruby check out this course. Ruby file 类和方法 file 表示一个连接到普通文件的 stdio 对象 open 为普通文件返回该类的一个实例 类方法 序号方法 描述 1file atime path 返回 path 的最后访问时间 2file basename path suffix 返回 path 末尾的文件名 如果指定了 suffix 则它会从文件名末尾被删除. This chapter will cover all the basic i o functions available in ruby.