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In Unix-like operating systems, unlink is a system call and a command line utility to delete files. The program directly interfaces the system call, which removes the file name and (but not on GNU systems) directories like rm and rmdir . [ 1 ]
unlink: Removes the specified file using the unlink function uptime: Tells how long the system has been running users: Prints the user names of users currently logged into the current host who: Prints a list of all users currently logged in whoami: Prints the effective userid: yes: Prints a string repeatedly
Perl is a high-level, general-purpose, interpreted, dynamic programming language. Though Perl is not officially an acronym, [9] there are various backronyms in use, including "Practical Extraction and Reporting Language". [10] Perl was developed by Larry Wall in 1987 [11] as a general-purpose Unix scripting language to make report processing ...
#!usr/bin/perl – called the "shebang line", after the hash symbol (#) and ! (bang) at the beginning of the line. It is also known as the interpreter directive. # – the number sign, also called the hash symbol. In Perl, the # indicates the start of a comment. It instructs perl to ignore the rest of the line and not execute it as script code.
An n-component link L ⊂ S 3 is an unlink if and only if there exists n disjointly embedded discs D i ⊂ S 3 such that L = ∪ i ∂D i. A link with one component is an unlink if and only if it is the unknot. The link group of an n-component unlink is the free group on n generators, and is used in classifying Brunnian links.
"Black Perl" is a code poem written using the Perl programming language. It was posted anonymously to Usenet on April 1, 1990, [1] and is popular among Perl programmers [citation needed] as a piece of Perl poetry. Written in Perl 3, the poem is able to be executed as a program.
The structure of the Perl programming language encompasses both the syntactical rules of the language and the general ways in which programs are organized. Perl's design philosophy is expressed in the commonly cited motto " there's more than one way to do it ".
Programming Perl, best known as the Camel Book among programmers, [1] is a book about writing programs using the Perl programming language, revised as several editions (1991–2012) to reflect major language changes since Perl version 4.