Ruby File Open Relative Path

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Ruby file open relative path.

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. If you enter the command properly you will get the result nil. Relative paths are referenced from the current working directory of the process unless dir string is given. If a file is being created its initial permissions may be set using the perm parameter.

The class io provides all the basic methods such as read write gets puts readline getc and printf. Using the require method. It yields pathname object for each child. 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.

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. The value of the block will be returned from file open. Expand path ruby usr bin. By default the yielded pathnames will have enough information to access the files.

The command to close an open file is. Expand path ruby usr bin usr bin ruby a more complex example which also resolves parent directory is as follows. Suppose we are in bin mygem and want the absolute path of lib mygem rb. Relative paths are referenced from the current working directory of the process unless dir string is given.

When a rails application is initialized the file expand path method is used in the config and script directories as well as the rakefile. This chapter will cover all the basic i o functions available in ruby. Iterates over the children of the directory files and subdirectories not recursive. All the i o methods are derived from the class io.