why does below program not work?
<> is producing nothing.. still waiting for input.. but i thought this would work?
#!/usr/bin/perl -w
use strict;
my @array2;
my @array1 = ("David Veterinarian 56", "Jackie Ass 34", "Karen Veterinarian 28");
$_ = @array1;
while (<>) {
... (4 Replies)
Collegues
I have an AWK script like the following.
{
if ($2 ~ /JJ/ && $4 ~ /IN/)
{
print $2, $3, $4, $5
}
}
How can I embed it in a perl program.
Jaganadh.G (5 Replies)
Hi
I have many problems with a script. I have a script that formats a text file but always prints the same error when i try to execute it
The code is that:
{
if (NF==17){
print $0
}else{
fields=NF;
all=$0;
while... (2 Replies)
I wish to write a Perl program that will provide a listing of files in a directory. The files must be listed in sorted order by the file name.
• By default, the program displays only file names.
• By default, the program lists the files in the current directory.
• The program must provide the... (2 Replies)
could i get any help with how to link this program together. i dont know what to put where the X's are
print `flush`;
thank(); #print thank header
use Getopt::Std; # use declaration with the options function
getopts("ld:") or usage() and exit; ... (3 Replies)
Long story short: I'm working inside of a Unix SSH under a bash shell. I have to code a C program that generates a random number. Then I have to call the compiled C program with a Perl program to run the C program 20 times and put all the generated random #s into a text file, then print that text... (1 Reply)
Hi
I am new to perl, i need to write a program to convert horizontal words to vertical
eg: cat, dog, cow,.....(text file)
this should be written as
1.cat
2.dog
like this. can u pls help me to work out.. (4 Replies)
I want to traverse a durectory for a particular file. Situataion is like this. Path is ABC/a/c/g. it has around 100 folders in it.
Search a directory which has word "*latest*" in its path.
and then from the latest go through z/x/c to file final.html.
In total, i want it to go through... (4 Replies)
can anyone help me out to write a code by connecting to the sql database and I need to print the list of tables present in the databse.
any ideas please. (1 Reply)
I created a program, so a kid can practice there math on it. It dispenses varies math problems and the kid must input an answer. I also want it to grade the work they have done, but I can't find the best place for it to print out the grade.
I have:
if ( $response =~ m/^/ ) {
$user_wants_to_quit... (1 Reply)
Perl::Critic::Policy::InputOutput::RequireBriefOpen(3) User Contributed Perl Documentation Perl::Critic::Policy::InputOutput::RequireBriefOpen(3)NAME
Perl::Critic::Policy::InputOutput::RequireBriefOpen - Close filehandles as soon as possible after opening them.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
One way that production systems fail unexpectedly is by running out of filehandles. Filehandles are a finite resource on every operating
system that I'm aware of, and running out of them is virtually impossible to recover from. The solution is to not run out in the first
place. What causes programs to run out of filehandles? Usually, it's leaks: you open a filehandle and forget to close it, or just wait a
really long time before closing it.
This problem is rarely exposed by test systems, because the tests rarely run long enough or have enough load to hit the filehandle limit.
So, the best way to avoid the problem is 1) always close all filehandles that you open and 2) close them as soon as is practical.
This policy takes note of calls to "open()" where there is no matching "close()" call within "N" lines of code. If you really need to do a
lot of processing on an open filehandle, then you can move that processing to another method like this:
sub process_data_file {
my ($self, $filename) = @_;
open my $fh, '<', $filename
or croak 'Failed to read datafile ' . $filename . '; ' . $OS_ERROR;
$self->_parse_input_data($fh);
close $fh;
return;
}
sub _parse_input_data {
my ($self, $fh) = @_;
while (my $line = <$fh>) {
...
}
return;
}
As a special case, this policy also allows code to return the filehandle after the "open" instead of closing it. Just like the close,
however, that "return" has to be within the right number of lines. From there, you're on your own to figure out whether the code is
promptly closing the filehandle.
The STDIN, STDOUT, and STDERR handles are exempt from this policy.
CONFIGURATION
This policy allows "close()" invocations to be up to "N" lines after their corresponding "open()" calls, where "N" defaults to 9. You can
override this to set it to a different number with the "lines" setting. To do this, put entries in a .perlcriticrc file like this:
[InputOutput::RequireBriefOpen]
lines = 5
CAVEATS
"IO::File->new"
This policy only looks for explicit "open" calls. It does not detect calls to "CORE::open" or "IO::File->new" or the like.
Is it the right lexical?
We don't currently check for redeclared filehandles. So the following code is false negative, for example, because the outer scoped
filehandle is not closed:
open my $fh, '<', $file1 or croak;
if (open my $fh, '<', $file2) {
print <$fh>;
close $fh;
}
This is a contrived example, but it isn't uncommon for people to use $fh for the name of the filehandle every time. Perhaps it's time to
think of better variable names...
CREDITS
Initial development of this policy was supported by a grant from the Perl Foundation.
AUTHOR
Chris Dolan <cdolan@cpan.org>
COPYRIGHT
Copyright (c) 2007-2011 Chris Dolan. Many rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license
can be found in the LICENSE file included with this module
perl v5.16.3 2014-06-09 Perl::Critic::Policy::InputOutput::RequireBriefOpen(3)