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In computing, redirection is a form of interprocess communication, and is a function common to most command-line interpreters, including the various Unix shells that can redirect standard streams to user-specified locations. The concept of redirection is quite old, dating back to the earliest operating systems (OS).
Unix shells use dup2 for input/output redirection. Along with pipe() , it is a tool on which Unix pipes rely. The following example uses pipe() and dup() in order to connect two separate processes ( program1 and program2 ) using Unix pipes :
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.
Process substitution can also be used to capture output that would normally go to a file, and redirect it to the input of a process. The Bash syntax for writing to a process is >(command). Here is an example using the tee, wc and gzip commands that counts the lines in a file with wc -l and compresses it with gzip in one pass:
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Console redirection Stream redirection Configurability Startup/shutdown scripts Batch scripts Logging Available as statically linked, independent single file executable Thompson shell: UNIX: sh 1971 — UNIX: UNIX — Yes Text-based CLI: No No — Yes — — — — — — Bourne shell 1977 version 7th Ed. UNIX: sh 1977 Yes [1] 7th Ed. UNIX ...
In Unix-like computer operating systems, a pipeline is a mechanism for inter-process communication using message passing. A pipeline is a set of processes chained together by their standard streams , so that the output text of each process ( stdout ) is passed directly as input ( stdin ) to the next one.
UUCP (Unix-to-Unix Copy) [1] is a suite of computer programs and protocols allowing remote execution of commands and transfer of files, email and netnews between computers.. A command named uucp is one of the programs in the suite; it provides a user interface for requesting file copy operations.