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  2. sed - Wikipedia

    en.wikipedia.org/wiki/Sed

    Commands in the sed script may take an optional address, in terms of line numbers or regular expressions. The address determines when the command is run. For example, 2d would only run the d (delete) command on the second input line (printing all lines but the second), while /^ /d would delete all lines

  3. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    For example, . is a very general pattern, [a-z] (match all lower case letters from 'a' to 'z') is less general and b is a precise pattern (matches just 'b'). The metacharacter syntax is designed specifically to represent prescribed targets in a concise and flexible way to direct the automation of text processing of a variety of input data, in a ...

  4. Soundex - Wikipedia

    en.wikipedia.org/wiki/Soundex

    Map all occurrences of a, e, i, o, u, y, h, w. to zero(0) Replace all consonants (include the first letter) with digits as in [2.] above. Replace all adjacent same digits with one digit, and then remove all the zero (0) digits; If the saved letter's digit is the same as the resulting first digit, remove the digit (keep the letter).

  5. Comparison of programming languages (syntax) - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_programming...

    COBOL: String constants may be continued by not ending the original string in a PICTURE clause with ', then inserting a -in column 7 (same position as the * for comment is used.) TUTOR: Lines starting with a tab (after any indentation required by the context) continue the prior command.

  6. Java syntax - Wikipedia

    en.wikipedia.org/wiki/Java_syntax

    interface StringManipulator {String extendString (String input); // A method which is optional to implement default String shortenString (String input) {return input. substring (1);}} // This is a valid class despite not implementing all the methods class PartialStringManipulator implements StringManipulator {@Override public String ...

  7. Digraphs and trigraphs (programming) - Wikipedia

    en.wikipedia.org/wiki/Digraphs_and_trigraphs...

    Unlike all other cases mentioned here, (* and *) were and still are in wide use. However, many compilers treat them as a different type of commenting block rather than as actual digraphs, that is, a comment started with (* cannot be closed with } and vice versa.

  8. List of Java keywords - Wikipedia

    en.wikipedia.org/wiki/List_of_Java_keywords

    As multiple inheritance is not allowed in Java, interfaces are used to circumvent it. An interface can be defined within another interface. long The long keyword is used to declare a variable that can hold a 64-bit signed two's complement integer. [5] [6] This keyword is also used to declare that a method returns a value of the primitive type ...

  9. Magic number (programming) - Wikipedia

    en.wikipedia.org/wiki/Magic_number_(programming)

    Thus, declaring const string testUserName = "John" is better than several occurrences of the 'magic value' "John" in a test suite. For example, if it is required to randomly shuffle the values in an array representing a standard pack of playing cards, this pseudocode does the job using the Fisher–Yates shuffle algorithm: