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Created by woolf on February 10, 2011 13:25:20 Last update: February 10, 2011 13:25:20
If Command Extensions are enabled (which is enabled by default), then there are several dynamic environment variables that can be expanded but which don't show up in the list of variables displayed by SET . These variable values are computed dynamically each time the value of the variable is expanded (but see example below). If the user explicitly defines a variable with one of these names, then that definition will override the dynamic one described below: %CD% - expands to the current directory string. %DATE% - expands to current date using same format as DATE command. %TIME% - expands to current time using same format as TIME command. %RANDOM% - expands to a random decimal number between 0 and 32767. %ERRORLEVEL% - expands to the...
Created by Dr. Xi on December 04, 2009 04:33:05 Last update: December 04, 2009 04:33:05
Variable Meaning $_ The default or implicit variable. @_ Within a subroutine the array @_ contains the parameters passed to that subroutine. $a, $b Special package variables when using sort() $<digit> Contains the subpattern from the corresponding set of capturing parentheses from the last pattern match, not counting patterns matched in nested blocks that have been exited already. $. Current line number for the last filehandle accessed. $/ The input record separator, newline by default. $| If set to nonzero, forces a flush right away and after every write or print on the currently selected output channel. Default is 0 (regardless of whether the channel is really buffered by the system or not; $| tells you only whether you've asked Perl explicitly to flush after...
Created by Dr. Xi on December 14, 2008 19:09:19 Last update: December 14, 2008 19:09:19
My mod_python app failed to extract Python eggs with this error:
[Sun Dec 14 09:40:03 2008] [error] [client 127.0...The error message suggested to set the PYTHON_EGG_CACHE environment variable. While this may help solve the problem, there's no reason why the Python egg can't be installed expanded:
easy_install -Z MySQL-python-1.2.2.tar.gz
Created by Dr. Xi on September 25, 2008 23:43:35 Last update: September 25, 2008 23:43:54
@INC is a list of directories Perl uses to find modules to load. You can add directories to @INC by use lib... , or set the PERLLIB environment variable:
# using default @INC use Net::Socket::NonBl...