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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).
Version 1 AT&T UNIX dd: Filesystem Mandatory Convert and copy a file Version 5 AT&T UNIX delta: SCCS Optional (XSI) Make a delta (change) to an SCCS file PWB UNIX df: Filesystem Mandatory Report free disk space Version 1 AT&T UNIX diff: Text processing Mandatory Compare two files; see also cmp Version 5 AT&T UNIX dirname: Filesystem Mandatory
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 Berkeley r-commands are a suite of computer programs designed to enable users of one Unix system to log in or issue commands to another Unix computer via TCP/IP computer network. [1] The r-commands were developed in 1982 by the Computer Systems Research Group at the University of California, Berkeley , based on an early implementation of ...
On Unix systems, the execute permission controls access to invoking the file as a program, and applies both to executables and scripts. As the permission is enforced in the program loader , no obligation is needed from the invoking program, nor the invoked program, in enforcing the execute permission – this also goes for shells and other ...
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."
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.
As with Unix shells, Ruby also allows for the delimiting identifier not to start on the first column of a line, if the start of the here document is marked with the slightly different starter <<-. Besides, Ruby treats here documents as a double-quoted string, and as such, it is possible to use the #{} construct to interpolate code.