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¬ ˜ ! ′ \lnot or \neg \sim ′ ' negation: not propositional logic, Boolean algebra: The statement is true if and only if A is false. A slash placed through another operator is the same as placed in front.
A similar problem exists for the POSIX shell, since POSIX only required its name to be sh, but did not mandate a path. A common value is /bin/sh, but some systems such as Solaris have the POSIX-compatible shell at /usr/xpg4/bin/sh. [13] In many Linux systems, /bin/sh is a hard or symbolic link to /bin/bash, the Bourne Again shell (BASH).
$ # bash shell $ /bin/bash-c 'echo a{p,c,d,b}e' ape ace ade abe $ # A traditional shell does not produce the same output $ /bin/sh-c 'echo a{p,c,d,b}e' a{p,c,d,b}e When brace expansion is combined with wildcards, the braces are expanded first, and then the resulting wildcards are substituted normally.
Negation, a unary operator in logic depicted as ~, ¬, or ! Bitwise NOT, an operator used in computer programming; NOT gate, a digital logic gate (commonly called an inverter) Nordic Optical Telescope, an astronomical telescope at Roque de los Muchachos Observatory, La Palma, Canary Islands
In logic, negation, also called the logical not or logical complement, is an operation that takes a proposition to another proposition "not ", written , , ′ [1] or ¯. [ citation needed ] It is interpreted intuitively as being true when P {\displaystyle P} is false, and false when P {\displaystyle P} is true.
The vertical bar is a punctuation mark used in computing and mathematics to denote absolute value, logical OR, and pipe commands.
ASCII does not encode either of these signs, though they are both included in Unicode. In Bash, Perl, and Ruby, operator <<EOF (where "EOF" is an arbitrary string, but commonly "EOF" denoting "end of file") is used to denote the beginning of a here document. In C and C++, operator << represents a binary left shift.
The backslash \ is a mark used mainly in computing and mathematics.It is the mirror image of the common slash /.It is a relatively recent mark, first documented in the 1930s