In computing and telecommunication, an escape character is a single character which in a sequence of characters signifies that what is to follow takes an alternative interpretation. Computing is usually defined like the activity of using and developing Computer technology Computer hardware and software. The term escape sequence refers to the escape character and the subsequent character or characters so modified. This article refers to codes used as commands for computing devices
In sh, the * character is a wildcard character, expanding via globbing. The Bourne shell, or sh, was the default Unix shell of Unix Version 7, and replaced the Thompson shell, whose executable file had the same For other meanings of 'wild card' see Wild card. The term wildcard character has the following meanings Telecommunication In In Computer programming, the verb glob or globbing is used to refer to an instance of Pattern matching behavior In isolation, it expands to the names of all files in the working directory. In Computing, the working directory of a process is a directory of a hierarchical File system, if any dynamically associated with each process So to refer to a file literally called * you need to tell the shell to not interpret it in this way, which you do by preceding it with a backslash (\) -- this escapes the * character. Compare:
rm *# delete all files in the current directory
rm \*# delete the file named *
Many modern programming languages specify the doublequote character (") as a delimiter for a string literal. A programming language is an Artificial language that can be used to write programs which control the behavior of a machine particularly a Computer. A delimiter is a sequence of one or more characters used to specify the boundary between separate independent regions in Plain text or other data stream A string literal is the representation of a string value within the Source code of a Computer program. The backslash escape character provides one way to include doublequotes inside a string literal. For example, in Perl:
print "Nancy said "Hello World!" to the crowd. NOTES FOR EDITORS "Perl" is not an acronym (read the "Name" section below ";
produces a syntax error, whereas:
print "Nancy said \"Hello World!\" to the crowd. ";
produces the intended output.
Some programming languages also provide other ways to prevent this type of error, without requiring an escape character (see e. g. delimiter collision). A delimiter is a sequence of one or more characters used to specify the boundary between separate independent regions in Plain text or other data stream
Early reference to this term is found in Bob Bemer's IBM technical publications. Robert William Bemer ( February 8, 1920 &ndash June 22, 2004) was a computer scientist best known for his work at IBM during the late
The Escape key is usually found on standard PC keyboards. The Esc key is a key labeled Esc or Escape that is used to generate the ASCII Escape character ( Control - ASCII code However it is commonly absent from keyboards for PDAs and other devices not designed primarily for ASCII communications, and not generally used as part of the common user interface for applications on the Windows operating system. The DEC VT220 series was one of the few popular keyboards that did not have a dedicated Esc key, instead using one of the keys above the main keypad, though it is debatable if this contributed to the failure of the DEC personal computer series that used this keyboard.
This article contains material from the Federal Standard 1037C, which, as a work of the United States Government, is in the public domain. Robert William Bemer ( February 8, 1920 &ndash June 22, 2004) was a computer scientist best known for his work at IBM during the late The Esc key is a key labeled Esc or Escape that is used to generate the ASCII Escape character ( Control - ASCII code This article refers to codes used as commands for computing devices ANSI escape codes are used to control text formatting and other output options on Text terminals In this context ANSI refers to the ANSI X3 A delimiter is a sequence of one or more characters used to specify the boundary between separate independent regions in Plain text or other data stream A metacharacter is a character that has a special meaning (instead of a Literal meaning to a computer program such as a shell interpreter or a Regular expression When applied to Computer languages stropping refers to the method used to mark letter sequences as having a special property (most often being a keyword or certain Federal Standard 1037C, entitled Telecommunications Glossary of Telecommunication Terms is a United States Federal Standard issued by the General Services Administration A work of the United States government, as defined by United States copyright law, is "a work prepared by an officer or employee of the U The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone