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Perl language learning - Introduction The introduction includes but is not limited to the following contents Introduction to PerlVersion historyFirst Perl programBasic data types of PerlPerl's operation operator and judgment operatorPerl array operationPerl control structure statementPerl subroutine Note: Although the logic controller is ...

Part1 Bypass skills about intval() function web89 clude("flag.php"); highlight_file(__FILE__); if(isset($_GET['num'])){ $num = $_GET['num']; if(preg_match("/[0-9]/", $num)){ die("no no no!"); } if(intval($num)){ echo $flag; } } It can be recognized as a number by intval, excluding the numbers 0-9 After ...

Using the awk command 1. What is awk AWK, a data filtering tool (similar to grep and more powerful than grep), is a data processing engine. It checks the input text based on pattern matching, processes and outputs it line by line. It is usually used in Shell scripts to obtain the specified data. When used alone, it can make statistics on text ...

awk 1, Introduction AWK is a language for processing text files and a powerful text analysis tool. AWK is called because it takes the first character of the Family Name of the three founders Alfred Aho, Peter Weinberger, and Brian Kernighan. 2, Basic grammar //awk [options] 'script command' file name awk [Option parameters] 'script' va ...

September 16 I. if Branch Structure 1. Process Control--Three Structures 1) Sequential structure (default) Default sequential structure for program execution Code executes from top to bottom, each code executes only once 2) Branch structure (if) You can choose to execute a section of code (if) depending on whether the ...