Ansi escape sequences clear scrollback9/10/2023 If 8 colors isn’t enough, which it might not be. Now that you have a good understanding of ANSI escape sequences, let’s take a look at what else can be done with them and have some fun! Putting the sequence back together again and running it within a terminal will result in the ASCII art #PSNow being displayed with a cyan font and flashing text. At the very end of the sequence `e[0m is calling the SGR function again, but this time it is using the argument 0 to reset and turn off all the attributes defined in the first sequence. In this example that is a here-string stored in the variable $acsiiArt that contains the ASCII art for #PS7Now. What follows after the function is the text that will be displayed. The function is called SGR (“Select Graphics Rendition”) and accepts several arguments which were define earlier in the sequence. Next in the sequence is the letter m which represents a function. In this example 36 represents a foreground color of cyan. Values 30-37 represent different foreground colors. Each argument must be separated by a semi colon, which is why you see a semi colon between 5 and 36. The number 5 represents an argument that makes the text within the sequence blink. Each of the numbers within this sequence represent an argument. The `e is the escape character and [ is the introducer. The sequence starts with the control sequence introducer `e[. Using some ASCII art as an example you can break down the sequence `"`e[5 36m$asciiArt`e[0m" into its different parts. The best way to understand ANSI escape sequences is to break it down into its different parts. That escape sequence will determine how the terminal interpret the characters and acts accordingly. Inside the square bracket is where you place the escape sequence. To use the escape character, you start a string with the escape character `e followed by an opening square bracket `e[. However, PowerShell now includes a special character for escape `e. Because of that you’d have to use "$(27)" to output an ASCII character representing an escape character. Windows PowerShell doesn’t have a built-in escape special character. ANSI escape sequences are often used with modifying command line prompt displays! Escape characters are a standard of in-band signaling that control the cursor location, color, font styling, and other options within terminals and terminal emulators. Most commonly escape characters are used to specify a virtual terminal sequence (ANSI escape sequence) that modifies the terminal. The escape character is used to indicate the beginning of a sequence and changes the meaning of the characters that follow the escape character. When using ANSI within PowerShell there are two main parts the escape character and the escape sequence.
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