an absolute pathname begins with the root directory and follows the tree branch by branch until the path to the desired directory or file is completed.
绝对路径名从根目录开始,通过一个又一个的分支,一直到你要去的目录或者文件为止。
this directory has a parent and 「grandparent」 directory, as we’ll see later. and pwd shows the directory’s absolute pathname
我们在后面将会看到,这个目录有父和「祖父」目录。
likewise, we can change the working directory from /usr/x11r6 to /usr/x11r6/bin in two different ways. first using an absolute pathname
同样地,我们可以使用两种方式将/usr/x11r6转到/usr/x11r6/bin目录下。