Perl Redirection Post: 302369091

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Top Forums Shell Programming and Scripting Perl Redirection Post 302369091 by SFNYC on Friday 6th of November 2009 12:14:21 PM

Old

11-06-2009

Registered User

You should always have

Code:

use strict;
use warnings;

in your code.

Once there, listen to their error & warning messages and clean them up.

"Use of uninitialized variable in line number so and so" is telling you that you are trying to print a variable with no value. Use an 'if' condition to test this before you print it or initialize the variable with some value by default.

To remove this message from your output, redirect stderr when you submit your script.

Code:

./myprog 2> /dev/null

should do the trick, but it won't get rid of the warning.

SFNYC

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rake

RAKE(1) 						 Ruby Programmers Reference Guide						   RAKE(1)

NAME

     rake -- Ruby Make

SYNOPSIS

     rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE]
	  [-r MODULE] [--rules] [variable=value] target ...

DESCRIPTION

     Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command.

     Rake has the following features:

     o	 Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax.  No XML files to edit. No quirky Makefile syntax
	 to worry about (is that a tab or a space?).

     o	 Users can specify tasks with prerequisites.

     o	 Rake supports rule patterns to synthesize implicit tasks.

     o	 Flexible FileLists that act like arrays but know about manipulating file names and paths.

     o	 A library of prepackaged tasks to make building rakefiles easier.

OPTIONS

     --version		 Display the program version.

     -C
     --classic-namespace
			 Put Task and FileTask in the top level namespace

     -D [PATTERN]
     --describe [PATTERN]
			 Describe the tasks (matching optional PATTERN), then exit.

     -E CODE
     --execute-continue CODE
			 Execute some Ruby code, then continue with normal task processing.

     -G
     --no-system
     --nosystem 	 Use standard project Rakefile search paths, ignore system wide rakefiles.

     -I LIBDIR
     --libdir LIBDIR	 Include LIBDIR in the search path for required modules.

     -N
     --no-search
     --nosearch 	 Do not search parent directories for the Rakefile.

     -P
     --prereqs		 Display the tasks and dependencies, then exit.

     -R RAKELIBDIR
     --rakelib RAKELIBDIR
     --rakelibdir RAKELIBDIR
			 Auto-import any .rake files in RAKELIBDIR.  (default is rakelib )

     -T [PATTERN]
     --tasks [PATTERN]	 Display the tasks (matching optional PATTERN) with descriptions, then exit.

     -e CODE
     --execute CODE	 Execute some Ruby code and exit.

     -f FILE
     --rakefile FILE	 Use FILE as the rakefile.

     -h
     --help		 Prints a summary of options.

     -g
     --system		 Using system wide (global) rakefiles (usually ~/.rake/*.rake ).

     -n
     --dry-run		 Do a dry run without executing actions.

     -p CODE
     --execute-print CODE
			 Execute some Ruby code, print the result, then exit.

     -q
     --quiet		 Do not log messages to standard output.

     -r MODULE
     --require MODULE	 Require MODULE before executing rakefile.

     -s
     --silent		 Like --quiet, but also suppresses the 'in directory' announcement.

     -t
     --trace		 Turn on invoke/execute tracing, enable full backtrace.

     -v
     --verbose		 Log message to standard output (default).

     --rules		 Trace the rules resolution.

SEE ALSO

     ruby(1) make(1)

     http://rake.rubyforge.org/

REPORTING BUGS

     Bugs, features requests and other issues can be logged at <http://onestepback.org/redmine/projects/show/rake>.

     You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>.  Or you can send an
     email to the author.

AUTHOR

     Rake is written by Jim Weirich <jim@weirichhouse.org>

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