Working with files

In a BlackBerry 10 OS system, almost everything is a file; devices, data, and even services are all typically represented as files. This lets you work with local and remote resources easily from the command line, or through any program that works with files.

Types of files

BlackBerry 10 OS supports various types of files. The ls -l command uses the character shown in parentheses below to identify the file type:

Regular (-)
A file that contains user data, such as C code, HTML, and data. For example, /home/fred/myprog.c.
Directory (d)
Conceptually, a directory is something that contains files and other directories. For example, /home/fred.

A directory is implemented as a disk file that stores a list of the names of files and other directories. Each filename is associated with an inode (information node) that defines the file's existence.

Symbolic link (l)
An additional name for a file or directory.
Named special (n)
A shared memory region, such as, /dev/shmem/Pg101e0001.
Character special files (c)
Entries that represent a character device. For example, /dev/ser1 represents a serial port.
FIFO special files (p)
Persistent named pipes through which two programs communicate. For example, PipeA.
Block special files (b)
Entries that represent a block device, such as a disk. For example, /dev/hd0 represents the raw block data of your primary disk drive.
Socket files (s)
Entries that represent a communications socket, especially a UNIX-domain socket. For more information, see socket() and the UNIX protocol in the BlackBerry 10 OS C Library.

Some files are persistent across system reboots, such as most files in a disk file system. Other files may exist only as long as the program responsible for them is running. Examples of these include shared memory objects, objects in the /proc file system, and temporary files on disk that are still being accessed even though the links to the files (their filenames) have been removed.

Last modified: 2015-03-31

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