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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).
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:
The book is in its 8th edition. The book features a tarsier on the cover, an image which was also used on the cover of O'Reilly's Unix in a Nutshell and has been incorporated into O'Reilly Media. When questioned about the animal choice, publisher Tim O'Reilly described the tarsier as looking "like somebody who had been a text editor for too long."
Much available free and open-source software is written for the POSIX API. Since so much more development flows into the Linux kernel as compared to the other POSIX-compliant combinations of kernel and C standard library, [citation needed] the Linux kernel and its API have been augmented with additional features. Programming for the full Linux ...
The Linux Network Administrator's Guide is a book on setting up and running Unix and Linux networks. [1] The first and second editions are freely available in electronic form under the GFDL. It was originally produced by Olaf Kirch and others as part of the Linux Documentation Project with help from O'Reilly.
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.
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 ...