Perl

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I'm not sure if undef has a definite relationship with the elimination of values from the array, guess what, if we treat undef as "empty," there will be some connection. But generally, assigning something to undef and deleting something is different.

Using signal, you can make your program more functional. To get all the signal under Linux, use the kill-l. Here is the output on my machine (which is not listed in the following 64): Copy Code code as follows: xuyang@xuyang-desktop:

First article: Copy Code code as follows: operator meaning -r file or directory readable -w file or directory writable -x file or directory execution -o file or directory owned by user -r file or directory to true user readable -W

1. Chop and Chomp functionsAll two functions take a string as a parameter and remove the last character at the end. The difference is that, regardless of the last character, chop is stripped and returned in the return value, and Chomp is stripped

Why use references? In Perl4, the Value field in a hash table can only be scalar, not a list, which is inconvenient for some situations, such as the following data:Chicago, USAFrankfurt, GermanyBerlin, GermanyWashington, USAHelsinki, FinlandNew

1) The default Inc is as follows: Copy Code code as follows: @INC: C:/perl/site/lib C:/perl/lib 2 Set up environment variable PERL5LIB to add to Inc, for example:Set Perl5lib=c:\perllibs After setting the Perl5lib as below,

Copy Code code as follows: APR_DECLARE_NONSTD (unsigned int) apr_hashfunc_default (const char *char_key, apr_ssize_t *klen) { unsigned int hash = 0; Const unsigned char *key = (const unsigned char *) Char_key; const unsigned char *p;

Overview Virtualization, as the foundation of cloud computing, is an important trend at present. Virtualization can improve the efficiency and availability of IT resources and applications. The kernel based virtual machine KVM was RedHat acquired

Use spreadsheet in CPAN::P arseexcel module to read the contents of the Excel file, when encountering Chinese garbled problem, use spreadsheet::P arseexcel::fmtunicode module recoding, When assigning Chinese to a variable, the Encode module is

Source:Http://www.cnblogs.com/itech/archive/2013/02/20/2919204.htmlHttp://stackoverflow.com/questions/5703705/print-current-directory-using-perl?rq=11)The following get the script ' s directory, which is not the same as the current directory. It ' s

Replace with s/// : If you think of m// pattern matching (pattern match) as the word processor's "find" function, then The s/// replace (substitution) operator is the "Find and replace" function. This operator simply replaces the part of the

"Original, do not reprint without permission"A hash is a data structure that is similar to and to a group in that it can hold any number of values and can be used on demand, and that the array is indexed by numbers, and the hashes are indexed by

Perl Structure Control Statements:If condition statement:if (condition) {Expression} elsif {Expression} else {Expression}Unless conditional statements:The condition is false when executed.Unless (condition) {Expression} elsif {Expression} else

Regular Expressions:The regular expression in Perl is called a pattern, which is a template that matches a string.Perl's regular expressions are similar to Shell/awk/sed/grep.m/pattern/Operation pattern Matching:/pattern/is the shorthand of

The foreach structure in perl first syntax foreach $rock (qw/bedrock slate lava/) {$rock = "\t$rock"; $rock. = "\ n";}Foreach iterates from the first element of a list (array) to the last element, one iteration at a time. The control variable (in

Original article address:Http://blogread.cn/it/article/743? F = WB   I used Perl to write some monitoring scripts and put them in crontab for scheduling and execution. Sometimes you will find that a script runs for too long and starts multiple

Perl object-oriented first let's take a look at the three basic definitions of Perl Object-Oriented Programming: 1. an "object" refers to a simple reference that "there is a way to know which class it belongs. (An object is a reference variable) 2.

I. List The list is a sequence of values contained in parentheses. It can be any value or empty, for example: (1, 5.3, "hello", 2), empty list :(). Note: The list containing only one value (for example, (43.2) is different from the value itself (I

1. Perl array (1 ): 1) initialize the array @ array = ("stringA", "stringB", "stringC ");2) print $ array [-1]; # output the stringC with the index (-1 + 3) % 3 = 23) dynamic growth $ array [4] = "stringD"; # Although $ array [3] is not used yet, it