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In Linux, the System.map file is a symbol table used by the kernel. A symbol table is a look-up between symbol names and their addresses in memory. A symbol name may be the name of a variable or the name of a function. The System.map is required when the address of a symbol name, or the symbol name of an address, is needed.
In Unix-like operating systems, find is a command-line utility that locates files based on some user-specified criteria and either prints the pathname of each matched object or, if another action is requested, performs that action on each matched object.
The command has been implemented in operating systems such as Unix, DOS, IBM OS/2, [1] MetaComCo TRIPOS, [2] AmigaOS [3] (where if a bare path is given, cd is implied), Microsoft Windows, ReactOS, [4] and Linux. On MS-DOS, it is available in versions 2 and later. [5] DR DOS 6.0 also includes an implementation of the cd and chdir commands. [6]
Unix abstracts the nature of this tree hierarchy entirely and in Unix and Unix-like systems the root directory is denoted by the / (slash) sign. Though the root directory is conventionally referred to as /, the directory entry itself has no name – its path is the "empty" part before the initial directory separator character (/).
Modern Linux distributions include a /run directory as a temporary filesystem , which stores volatile runtime data, following the FHS version 3.0. According to the FHS version 2.3, such data were stored in /var/run , but this was a problem in some cases because this directory is not always available at early boot.
A symbolic link contains a text string that is automatically interpreted and followed by the operating system as a path to another file or directory. This other file or directory is called the "target". The symbolic link is a second file that exists independently of its target. If a symbolic link is deleted, its target remains unaffected.
Display the current working directory physical path - without symbolic link name, if any. Example: If standing in a dir /home/symlinked, that is a symlink to /home/realdir, this would show /home/realdir pwd -L: Display the current working directory logical path - with symbolic link name, if any.
A home directory is a file system directory on a multi-user operating system containing files for a given user of the system. The specifics of the home directory (such as its name and location) are defined by the operating system involved; for example, Linux / BSD systems use /home/ username or /usr/home/ username and Windows systems since Windows Vista use \Users\ username .