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The character between the address and the symbol (separated by spaces) is the type of a symbol. The nm utility program on Unix systems lists the symbols from object files. The System.map is directly related to it, in that this file is produced by nm on the whole kernel program – just like nm lists the symbols and their types for any small object programs.
The ln command is a standard Unix command utility used to create a hard link or a symbolic link (symlink) to an existing file or directory. [1] The use of a hard link allows multiple filenames to be associated with the same file since a hard link points to the inode of a given file, the data of which is stored on disk.
Although storing the link value inside the inode saves a disk block and a disk read, the operating system still needs to parse the path name in the link, which always requires reading additional inodes and generally requires reading other, and potentially many, directories, processing both the list of files and the inodes of each of them until ...
f: regular file; l: symbolic link; p: named pipe; s: socket; D: door.-print: always returns true; prints the name of the current file plus a newline to the stdout.-print0: always returns true; prints the name of the current file plus a null character to the stdout. Not required by POSIX.
file://host/path. where host is the fully qualified domain name of the system on which the path is accessible, and path is a hierarchical directory path of the form directory/directory/.../name. If host is omitted, it is taken to be "localhost", the machine from which the URL is being interpreted.
The file mode which determines the file type and how the file's owner, its group, and others can access the file. A link count telling how many hard links point to the inode. The User ID of the file's owner. The Group ID of the file. The device ID of the file if it is a device file. The size of the file in bytes.
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The most common special file is the directory. The layout of a directory file is defined by the filesystem used. As several filesystems are available under Unix, both native and non-native, there is no one directory file layout. A directory is marked with a d as the first letter in the mode field in the output of ls -dl [5] or stat, e.g.