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Top Forums Shell Programming and Scripting Perl String Replacement Syntax Question . . . Post 302902100 by LinQ on Sunday 18th of May 2014 04:39:03 PM
Old 05-18-2014
@Aia: Thanks for stopping by.

However, the code didn't run out of the box.

Fixed:
Code:
#!/usr/bin/perl
# -w removed from shebag since it does the same that use warnings

use strict;
use warnings;
my $line;
my $file = 'test.txt';
open (my $content, "<", $file) or die("Could not open file. $!");

# read the content one line at a time
while ( $line = <$content> ) {
    $line =~ s/Mary/Joe/g;
    print "$line";
}

close $content;

While this ran, test.txt was unchanged; and the altered text was simply directed to the command line. Couldn't get any modification to work as planned...

So, after more digging around, I tried to rectify the problem thusly:
Code:
#!/usr/bin/perl

use diagnostics;
use strict;
use warnings;

our $content;

open ($content, "<", "test.txt");
$content =~ s/Mary/Joe/g;
open ($content, ">", "test.txt");

close $content;

This block runs without warnings or errors, but instead of the text ($content) being altered and returned to the original file (as the apparent logic/flow would indicate), all in "test.txt" is erased; and the script simply exits.

FWIW, the perldocs were rather confusing/obtuse on all of this...

???


Thanks again Smilie

---------- Post updated at 04:20 PM ---------- Previous update was at 04:05 PM ----------

Stop the presses!

Working with something over here. Seems I got confused over handles/content.

Back soon --

---------- Post updated at 04:39 PM ---------- Previous update was at 04:20 PM ----------

Back again.

This time, the code seems better in some regards, but the result is still the same: All content of test.txt is simply erased--
Code:
#!/usr/bin/perl

use diagnostics;
use warnings;
use strict;
 
my $src = 'test.txt';
my $des = 'test.txt';
my $line;
 
# open source file for reading
open(SRC,'<',$src) or die $!;
 
# open destination file for writing
open(DES,'>',$des) or die $!;
 
while($line = <SRC>){
$line =~ s/Mary/Joe/g;
   print $line $des;    
}
 
# always close the filehandles
close(SRC);
close(DES);

Really confused now...

Smilie
 

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Test::Strict(3pm)					User Contributed Perl Documentation					 Test::Strict(3pm)

NAME
Test::Strict - Check syntax, presence of use strict; and test coverage SYNOPSIS
"Test::Strict" lets you check the syntax, presence of "use strict;" and presence "use warnings;" in your perl code. It report its results in standard "Test::Simple" fashion: use Test::Strict tests => 3; syntax_ok( 'bin/myscript.pl' ); strict_ok( 'My::Module', "use strict; in My::Module" ); warnings_ok( 'lib/My/Module.pm' ); Module authors can include the following in a t/strict.t and have "Test::Strict" automatically find and check all perl files in a module distribution: use Test::Strict; all_perl_files_ok(); # Syntax ok and use strict; or use Test::Strict; all_perl_files_ok( @mydirs ); "Test::Strict" can also enforce a minimum test coverage the test suite should reach. Module authors can include the following in a t/cover.t and have "Test::Strict" automatically check the test coverage: use Test::Strict; all_cover_ok( 80 ); # at least 80% coverage or use Test::Strict; all_cover_ok( 80, 't/' ); DESCRIPTION
The most basic test one can write is "does it compile ?". This module tests if the code compiles and play nice with "Test::Simple" modules. Another good practice this module can test is to "use strict;" in all perl files. By setting a minimum test coverage through "all_cover_ok()", a code author can ensure his code is tested above a preset level of kwality throughout the development cycle. Along with Test::Pod, this module can provide the first tests to setup for a module author. This module should be able to run under the -T flag for perl >= 5.6. All paths are untainted with the following pattern: "qr|^([-+@w./:\]+)$|" controlled by $Test::Strict::UNTAINT_PATTERN. FUNCTIONS
syntax_ok( $file [, $text] ) Run a syntax check on $file by running "perl -c $file" with an external perl interpreter. The external perl interpreter path is stored in $Test::Strict::PERL which can be modified. You may prefer "use_ok()" from Test::More to syntax test a module. For a module, the path (lib/My/Module.pm) or the name (My::Module) can be both used. strict_ok( $file [, $text] ) Check if $file contains a "use strict;" statement. "use Moose" and "use Mouse" are also considered valid. This is a pretty naive test which may be fooled in some edge cases. For a module, the path (lib/My/Module.pm) or the name (My::Module) can be both used. warnings_ok( $file [, $text] ) Check if warnings have been turned on. If $file is a module, check if it contains a "use warnings;" or "use warnings::..." or "use Moose" or "use Mouse" statement. If the perl version is <= 5.6, this test is skipped ("use warnings" appeared in perl 5.6). If $file is a script, check if it starts with "#!...perl -w". If the -w is not found and perl is >= 5.6, check for a "use warnings;" or "use warnings::..." or "use Moose" or "use Mouse" statement. This is a pretty naive test which may be fooled in some edge cases. For a module, the path (lib/My/Module.pm) or the name (My::Module) can be both used. all_perl_files_ok( [ @directories ] ) Applies "strict_ok()" and "syntax_ok()" to all perl files found in @directories (and sub directories). If no <@directories> is given, the starting point is one level above the current running script, that should cover all the files of a typical CPAN distribution. A perl file is *.pl or *.pm or *.t or a file starting with "#!...perl" If the test plan is defined: use Test::Strict tests => 18; all_perl_files_ok(); the total number of files tested must be specified. You can control which tests are run on each perl site through: $Test::Strict::TEST_SYNTAX (default = 1) $Test::Strict::TEST_STRICT (default = 1) $Test::Strict::TEST_WARNINGS (default = 0) $Test::Strict::TEST_SKIP (default = []) "Trusted" files to skip all_cover_ok( [coverage_threshold [, @t_dirs]] ) This will run all the tests in @t_dirs (or current script's directory if @t_dirs is undef) under Devel::Cover and calculate the global test coverage of the code loaded by the tests. If the test coverage is greater or equal than "coverage_threshold", it is a pass, otherwise it's a fail. The default coverage threshold is 50 (meaning 50% of the code loaded has been covered by test). The threshold can be modified through $Test::Strict::COVERAGE_THRESHOLD. You may want to select which files are selected for code coverage through $Test::Strict::DEVEL_COVER_OPTIONS, see Devel::Cover for the list of available options. The default is '+ignore,"/Test/Strict"'. The path to "cover" utility can be modified through $Test::Strict::COVER. The 50% threshold is a completely arbitrary value, which should not be considered as a good enough coverage. The total coverage is the return value of "all_cover_ok()". CAVEATS
For "all_cover_ok()" to work properly, it is strongly advised to install the most recent version of Devel::Cover and use perl 5.8.1 or above. In the case of a "make test" scenario, "all_perl_files_ok()" re-run all the tests in a separate perl interpreter, this may lead to some side effects. SEE ALSO
Test::More, Test::Pod. Test::Distribution, <Test:NoWarnings> AUTHOR
Pierre Denis, "<pdenis@gmail.com>". COPYRIGHT
Copyright 2005, 2010 Pierre Denis, All Rights Reserved. You may use, modify, and distribute this package under the same terms as Perl itself. perl v5.10.1 2010-02-14 Test::Strict(3pm)
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