Title: MTS system architecture
Content:  Specific parts of a file or device can be referenced by including starting and ending line numbers and possibly a line number increment in parentheses separated by commas. The line numbers and increment are integers scaled by 1000 and can be positive or negative (±nnnnn.nnn). For example, SIMPLE.F(-35,197.5) would open the file SIMPLE.F, starting at the first line number greater or equal to -35 and return an 'end of file' instead of the first line number greater than 197.5. One can also include line number increments—as an example: SIMPLE.F(2,200,2) would return all (and only) even line numbers between 2 and 200 (inclusive). The symbolic line numbers FIRST or *F, 
Title: Shell script
Content:  The shebang, or hash-bang, is a special kind of comment which the system uses to determine what interpreter to use to execute the file. The shebang must be the first line of the file, and start with "<tt>#!</tt>". In Unix-like operating systems, the characters following the "<tt>#!</tt>" prefix are interpreted as a path to an executable program that will interpret the script.
Title: Line number
Content:  In computing, a line number is a method used to specify a particular sequence of characters in a text file. The most common method of assigning numbers to lines is to assign every line a unique number, starting at 1 for the first line, and incrementing by 1 for each successive line. In the C programming language the line number of a source code line is one greater number of new-line characters read or introduced up to that point. Programmers could also assign line numbers to statements in older programming languages, such as Fortran, JOSS, and BASIC. In Fortran, not every statement needed a line number, and line numbers did not have to be in sequential order. The purpose of line numbers was for branching and for reference by formatting statements. Both JOSS 
Title: HAL/S
Content:  this format, the first and third lines are usable for superscripts (exponents) and subscripts (indices). The multi-line format was designed to permit writing of HAL/S code that is similar to mathematical notation. As an example, the statement is denoted by a dollar sign,with the subscript expression enclosed in parentheses. The same code fragment could be written in multiple-line format as: E      2     2 M X = A  + B S            I In the example, the base line of the statement is indicated by an 'M' in the first column, the exponent line is indicated by an 'E', and the subscript line is indicated by an 'S'.
Title: Opening sentence
Content:  At the beginning of a written work stands the opening sentence. The opening line is part or all of the opening sentence that may start the lead paragraph. For older texts the Latin term "incipit" (it begins) is in use for the very first words of the opening sentence. As in speech, a personal document such as a letter normally starts with a salutation; this, however, tends not to be the case in documents, articles, essays, poetry, lyrics, and general works of fiction and nonfiction. In nonfiction, the opening sentence generally points the reader to the subject under discussion directly in a matter-of-fact style. In journalism, the opening line typically sets out the scope of the article. In fiction, authors have much liberty in the way they can cast the beginning. Techniques to hold the reader's attention include keeping the opening sentence to the point, showing attitude, shocking, and 
Title: Line (poetry)
Content:  of the line is also the beginning of a new sentence. There is, however, some much earlier poetry where new lines begin with lowercase letters. Beginning a line with an uppercase letter when the beginning of the line does not coincide with the beginning of a new sentence is referred to by some as "majusculation". (this is an invented term derived from majuscule). The correct term is a coroneted verse. In T.S. Eliot's The Waste Land, where ambiguity abounds, a line break in the opening (ll. 5–7) starts things off. Because the lines start with capitalized letters, Eliot could be saying "Earth" as the planet or "earth" as the soil.
Title: Initial
Content:  <blockquote style="width:50%;"> With a drop cap, the initial sits within the margins and runs several lines deep into the paragraph, indenting some normal-sized text in these lines. This keeps the left and top margins of the paragraph flush. In modern computer browsers, this may be achieved with a combination of HTML and CSS by using the float: left; setting. A CSS-only solution alternatively can use the :first-letter pseudo-element. An example of this format is the following paragraph: <blockquote style="width:50%;"> L orem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud 
Title: Line (text file)
Content:  In computing, a line is a unit of organization for text files. A line consists of a sequence of zero or more characters, usually displayed within a single horizontal sequence. Depending on the file system or operating system being used the number of characters on a line may either be predetermined or fixed, or the length may vary from line to line. Fixed-length lines are sometimes called records. With variable-length lines, the end of each line is usually indicated by the presence of one or more special end-of-line characters, such as a line feed or carriage return. A blank line usually refers to a line containing zero characters (not counting any end-of-line characters); though it may also refer to any line that does not contain any visible characters (consisting only of whitespace). Some tools that operate on text files (e.g., editors) provide a mechanism to reference lines by their line number.
Title: Shakespeare Programming Language
Content:  The first line in a Shakespeare program is called the 'title'. The compiler considers anything from the first line to the first period to be a comment.
Title: FASTA format
Content:  less (often 70) in FASTA lines. Also, the width of a standard printed page is 70 to 80 characters (depending on the font). Hence, 80 characters became the norm. The first line in a FASTA file started either with a ">" (greater-than) symbol or, less frequently, a ";" (semicolon) was taken as a comment. Subsequent lines starting with a semicolon would be ignored by software. Since the only comment used was the first, it quickly became used to hold a summary description of the sequence, often starting with a unique library accession number, and with time it has become commonplace to always use ">" for the first line and to not use ";" comments (which would otherwise be ignored). Following the 

Question: what is the first line of an http request to the server?
Answer: A request line.
the status line.