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Install the perl module in CentOS 5 to support IPV6 LWP: UserAgent is used in our product for http requests in perl code. The test shows that the following error is returned in a pure V6 environment: Can't connect to [2001: db8: 0: 1: 10: 208: 135: 232]: 8002 (Bad hostname '[2001: db8: 0: 1:

Author: mellonfire2006-05-12 10:10:26 You may already know that there are many existing Perl modules on the Perl integrated collection network (Comprehensive Perl archive network, CPAN), allowing deve

">" Creates a new file store information. Copy Code code as follows: #read from a file My $file = "input.txt"; Open (My $fh, "while (My $aline = #chomp no new line character Chomp ($aline); Print $aline; } Close $fh;# Write to a fileMy $output = "output.txt";Open (My $fhOutput, ">", $output) or Die ("Error:cannot open $output file!");Print $fhOutput "something";Close $fhOutput; 5. Regular expressions There are

Label:The most commonly used package for Perl access to a database is DBI, which can be found in www.cpan.org. Also need to install the corresponding database driver package, such as Dbd::mysql, Dbd::oracle, dbd::sybase or DBD::ODBC. First, the basic process In general, database operations consist of a common process of following several steps: 1. Establish a database connection 2. Execute SQL statements by establishing a database connection 3. Get th

retrieve the elements in the list. The subscript starts from 0. Negative subscript indicates inverted subscript. For example, list [-1] indicates the last element, while list [-2] indicates the second to last element. (QW (jan feb mar apr may jun jul aug sep oct nov dec) [-2 .. 1]) equal to ('nov', 'dec ', 'Jan', 'feb ') Use multiple subscripts to slice the list: (19, 68, 47, 60, 53, 51, 58, 55, 47) [(4, 5, 6)] will get (53, 51, 58) Can al

Basic usage # initialize % H as an empty array % H ={}; # use an array to initialize % H as a => 1, B => 2% H = ('A', 1, 'B', 2); % H = ('A' => 1, 'B' => 2); # If the key is a string, % H = (a => 1, B => 2) can be omitted. # Use {} to access print "$ H {A} n "; # Print $ H {B} = '2b '; print "$ H {B} n"; # print 2B # delete key using delete $ H {B }; # Delete 'B' from $ h to clear Perl hash UNDEF % H; obtain all hash key values # obtain all keys. The

Perl does not have various variable types like C/C ++. The variable type in Perl is determined by context, whether it is a string or an integer variable. For example, my $ para = @ _ # indicates the scalar context. $ para obtains the number of elements in. My ($ para) = @ _ # This is the context of the list. $ para gets the element value in. The specific context is determined by the variable type on the lef

1. Unless control structure Execute when the condition is false, opposite to if Else can be attached. 2. Until control structure If the condition is false, it is executed until the condition is true; 3. Conditional Modifiers The effect is equivalent: Similar mode: 4. Bare block control structure { Body; Body; .... } Helps to define valid ranges for temporary variables 5. elsif clause 6. Auto-increment and auto-Increment Same as C Language 7. Same

1.> clear file data and overwrite;> append at the end of the file2. It is recommended that you close a file handle immediately, regardless of whether the program ends immediately.3. $! Indicates some readable information generated by the system, such as insufficient permissions and the file does not exist. The information contained in it is only valid when the system request fails.4. As a general rule (die statement), if a usage error occurs, a line break is added to the message. If it is anothe

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Reprinted: http://www.zzzyb.com/html/fuwuqijishu/Linux/20090822/13345.html Thanks to the original author! Bytes ----------------------------------------------------------------------------------------------------------------- 1. First install some packages dependent on git. yum install zlib-devel yum install openssl-devel yum install perl yum install cpio yum install expat-devel yum install gettext-devel Next, if you have installed curl, skip this