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There are times when you ll need to write debugging-style information to something other than the standard output and error filehandles In these situations, you can redirect the information directly to another file we ve already seen examples of this with the caller function earlier in this chapter There are a number of different ways in which we can do this At the simplest level, you can just use print to send the output somewhere else For a more comprehensive solution, you should think about redirection This approach will ensure that warn and die also output their information to the log, rather to than to the real STDERR The final solution is to report information to the syslog daemon on a Unix machine, or to the Event Log on a Windows machine This procedure is useful for scripts that play a vital role in an administration environment, where you need the information to be reported to a central, rather than an application-specific, log

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The simplest way of creating a log without seriously affecting the output of your script is to simply redirect the default STDOUT and STDERR to somewhere else, which you can do like this:

F i g 1 0 -3

open(SECOUT,">&STDOUT"); open(SECERR,">&STDERR"); open(STDOUT,">stdlogtxt"); open(STDERR,">stderrtxt");

21:

3 Rest the pointer on each of the buttons and read the tooltips Table 10-1 contains a list of object snap modes and their functions To enter an object snap mode at the keyboard, enter only the capitalized letters

If you re going to redirect the complete output of a script, consider placing the redirection statement into a BEGIN block, so that everything is redirected to the log files, even if an error is raised by an imported module In fact, it s probably best to follow those statements with

select SECOUT;

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2 From the Object Snap toolbar, pick the Snap to Quadrant button Quadrant points on a circle are the points at 0 , 90 , 180 , and 270 If you were to connect these points with horizontal and vertical lines, as shown in Fig 10-4, you would divide the circle into four equal parts Each part is a quadrant of the circle

to ensure that standard print and other calls send their output to the real STDOUT and not the redirected one It s a good idea to switch off the file buffering when sending information to a log; doing this prevents overruns and ensures that data is written, even if the script crashes Since you will have control over the filehandle on which you provide the user interface, but not the filehandle used to print the debugging information from the contributed module, redirecting only STDERR is often a more practical solution It s also possible, using this method, to create a log file of the debug output you create This file is especially useful when using an indirectly accessed script, such as that used on a web server Here, printing the debug information to the standard output will cause the information to be included as part of the document that is sent back to the user s web browser

If you don t want to redirect the STDOUT and STDERR filehandles, the other solution is to create a function that opens and then writes the information you supply directly to a log file

Fig 10-4

sub writelog { my ($format,@rgs) = @_; open(LOGFILE,">>debuglog") or die "Can't open debug log!: $!\n"; printf LOGFILE ($format,@args); close LOGFILE; } FINE-TUNING APPLICATIONS

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