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  • Introduction to Single Lens Elements
    Single lens elements, known as "singlets," are the basic elements in every optical system. They are used to manipulate narrow laser beams or to build prototype imaging systems. They are also used as magnifiers, relay lenses and field lenses. Singlets are used in combination to achieve high-quality
  • [Chapter 2] 2.4 Using awk<
    it encounters problems in your program. Thus, we won't quote a particular version's messages here; it'll be obvious when there's a problem. Messages can be caused by any of the following:Not enclosing a procedure within braces ({})Not surrounding the instructions within single quotes (`')Not enclosing regular
  • [Chapter 6] 6.5 To Join a Phrase<
    the script itself is enclosed in single quotes, which protect characters that are normally special to the shell from being interpreted. The sequence of a double-quote pair inside a single-quote pair[2] makes sure the enclosed argument is evaluated first by the shell before the sed script is evaluated
  • [Chapter 3] 3.2 A Line-Up of Characters<
    reconstruct it. Let's see how it does on the sample file (we use double quotes to enclose the single quote character, and then a backslash in front of the embedded double quotes):$ grep " [\"[{(]*book[]})\"?!.,;:'s]* " bookwords This file tests for book in various places, such as as well
  • 4-D Nav Is Coming
    : NextGen and Single European Sky (known as SESAR) represent a new paradigm in separating aircraft and getting millions of passengers to their destinations in safety and - here's the caveat driving the proposed transformation - on time. The programs propose nothing short of actually automating ATC
  • [Chapter 10] 10.9 Invoking awk Using the #! Syntax<
    system does not support this syntax, you can change the script by removing the "#!", placing single quotes around the entire script, and ending the script with "$*", which expands to all shell command-line parameters.Well, we've quite nearly cleaned out this bottom drawer. The material in this chapter
  • [Chapter 4] 4.4 Four Types of sed Scripts<
    (''). We can use sed to change each doublequote character to a pair of single open-quotes or close-quotes (depending on context), which, when typeset, will produce the appearance of a proper "double quote."This is a considerably more difficult edit to make, since there are many separate cases
  • [Chapter 2] 2.2 Command-Line Syntax<
    specifies what instructions to perform. If specified on the command line, the script must be surrounded in single quotes if it contains a space or any characters that might be interpreted by the shell ($ and * for instance). One option common to both sed and awk is the -f option that allows you

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