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In Unix and Unix-like operating systems, printf is a shell builtin (and utility program [2]) that formats and outputs text like the same-named C function. Originally named for outputting to a printer, it actually outputs to standard output. [3] The command accepts a format string, which specifies how to format values, and a list of values.
edit line in text editor: Ctrl+X, Ctrl+E: Alt+E: Upon invocation, moves line input to a text editor evaluate line input: Ctrl+Alt+E — [11] Evaluates expressions in-place on the line editor history completion: Ctrl+R: implicit: history substitution!! deliberately omitted: Not discoverable explicit subshell (expression) fish -c expression ...
When a user presses the tab key within an interactive command-shell, Bash automatically uses command line completion, since beta version 2.04, [87] to match partly typed program names, filenames and variable names. The Bash command-line completion system is very flexible and customizable, and is often packaged with functions that complete ...
The wish is a GUI-based Tcl/Tk shell. The C and Tcl shells have syntax quite similar to that of said programming languages, and the Korn shells and Bash are developments of the Bourne shell, which is based on the ALGOL language with elements of a number of others added as well. [4]
Curses-based programs often have a user interface that resembles a traditional graphical user interface, including 'widgets' such as text boxes and scrollable lists, rather than the command line interface (CLI) most commonly found on text-only devices. This can make them more user-friendly than a CLI-based program, while still being able to run ...
According to the Open Group Base Specifications, IFS is an abbreviation for "input field separators." [1] A newer version of this specification mentions that "this name is misleading as the IFS characters are actually used as field terminators."
The placeholder may be a variable name, or in some languages an arbitrary expression, in either case evaluated in the current context. String interpolation is an alternative to building string via concatenation , which requires repeat quoting and unquoting; [ 2 ] or substituting into a printf format string , where the variable is far from where ...
A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command language and a scripting language, and is used by the operating system to control the execution of the system using shell scripts. [2]