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In computer science, a for-loop or for loop is a control flow statement for specifying iteration. Specifically, a for-loop functions by running a section of code repeatedly until a certain condition has been satisfied. For-loops have two parts: a header and a body. The header defines the iteration and the body is the code executed once per ...
Editing a FreeBSD shell script for configuring ipfirewall. A shell script is a computer program designed to be run by a Unix shell, a command-line interpreter. [1] The various dialects of shell scripts are considered to be command languages.
The Bash command-line completion system is very flexible and customizable, and is often packaged with functions that complete arguments and filenames for specific programs and tasks. Bash's syntax has many extensions lacking in the Bourne shell. Bash can perform integer calculations ("arithmetic evaluation") without spawning external processes.
On Unix-like systems, Secure Shell protocol (SSH) is usually used for text-based shells, while SSH tunneling can be used for X Window System–based graphical user interfaces (GUIs). On Microsoft Windows, Remote Desktop Protocol can be used to provide GUI remote access, and since Windows Vista , PowerShell Remote can be used for text-based ...
Foreach loop – The FOR and FORFILES commands both implement a for-each loop; find (Unix) – Unix command that finds files by attribute, similar to forfiles; find (Windows) – DOS and Windows command that finds text matching a pattern; grep – Unix command that finds text matching a pattern, similar to Windows find
Under Unix, the "everything is a file" paradigm naturally leads to a file-based event loop. Reading from and writing to files, inter-process communication, network communication, and device control are all achieved using file I/O, with the target identified by a file descriptor.
Everything is a file – describes one of the defining features of Unix; pipelines act on "files" in the Unix sense; Anonymous pipe – a FIFO structure used for interprocess communication; GStreamer – a pipeline-based multimedia framework; CMS Pipelines; Iteratee; Named pipe – persistent pipes used for interprocess communication