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A read–eval–print loop ( REPL ), also termed an interactive toplevel or language shell, is a simple interactive computer programming environment that takes single user inputs, executes them, and returns the result to the user; a program written in a REPL environment is executed piecewise. [ 1] The term usually refers to programming ...
0x0A (line feed, LF, , ^J), moves the print head down one line, or to the left edge and down. Used as the end of line marker in most UNIX systems and variants. 0x0B (vertical tab, VT, \v, ^K), vertical tabulation. 0x0C (form feed, FF, \f, ^L), to cause a printer to eject paper to the top of the next page, or a video terminal to clear the screen.
ANSI escape sequences are a standard for in-band signaling to control cursor location, color, font styling, and other options on video text terminals and terminal emulators. Certain sequences of bytes, most starting with an ASCII escape character and a bracket character, are embedded into text. The terminal interprets these sequences as ...
JavaScript uses the \ (backslash) as an escape character for: \' single quote \" double quote \\ backslash new line \r carriage return \t tab \b backspace \f form feed \v vertical tab (Internet Explorer 9 and older treats '\v as 'v instead of a vertical tab ('\x0B). If cross-browser compatibility is a concern, use \x0B instead of \v.)
FIGlet can read from standard input or accept a message as part of the command line. It prints to standard output. Some common arguments (options) are: -f to select a font file. (font files are available here)-d to change the directory for fonts.-c centers the output.-l left-aligns the output.-r right-aligns the output.
Node.js programs are invoked by running the interpreter node interpreter with a given file, so the first two arguments will be node and the name of the JavaScript source file. It is often useful to extract the rest of the arguments by slicing a sub-array from process.argv .
In all modern character sets, the null character has a code point value of zero. In most encodings, this is translated to a single code unit with a zero value. For instance, in UTF-8 it is a single zero byte. However, in Modified UTF-8 the null character is encoded as two bytes: 0xC0,0x80. This allows the byte with the value of zero, which is ...
Headless browser. A headless browser is a web browser without a graphical user interface . Headless browsers provide automated control of a web page in an environment similar to popular web browsers, but they are executed via a command-line interface or using network communication. They are particularly useful for testing web pages as they are ...