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In Electrical and Computer Engineering there is a particular kind of mathematics dealing with "logical expressions." This math is usually referred to as Boolean Algebra, the && represents the logical AND gate. This operator is used to compare two values (usually in binary algebra, which is Boolean Algebra on a base 2 number system, such as binary (the language of electronics and computers), a system with only 1 and 0 as possible values; or Boolean using true and false), an expression will be true only when both values are both true. i.e.:
Will use Boolean for this system (only true or false are possible values). If we have an expression such as:
y = a && b;
whereas y, a, and b are variables which can equal only 0 (false) or 1 (true).
You have these possible outcome combinations:
| y | a | b |
| 0 | 0 | 0 |
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 0 | 1 | 1 |
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What do four ampersands all strung together mean in a UNIX command string?
4 ampersands together is not legal for Unix/Linux.
Why does 1 plus 1 gives you 2?
It follows directly from the definition of what 1, 2, and "plus" are. 1 and 2 are simply symbols that are associated with a particular quantity. For example, 1 ampersand is: &. 2 ampersands are: &&. 3 ampersands are &&&.Addition can be defined by taking two sets, combining them into one set, and counting the number of things in the set. So If we take a set of ampersands that has 1 ampersand (&) and another that has 1 ampersand (&), combine those sets of ampersands into a single set (&&) and count the number of ampersands in it, then we have proved that 1 + 1 = 2.
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