die

Perl: How to “die” with no error message?

由 谁说我不能喝 提交于 2021-02-08 19:54:32
问题 I run a simple file test in perl with the code below: my $f1 = "$pre_file"; unless (-e $1) { print "\n Pre_check file does not exists! \n"; die; } It prints the following output: Pre_check file does not exists! Died at ./huawei-postcheck line 81. However I do not want the last line "Died at ./huawei-postcheck line 81.". I want to to "die" with no error message. Is it possible? 回答1: You could just say die "\n"; to suppress the message. 回答2: See the documentation for die. If the last element of

Perl: How to “die” with no error message?

由 梦想与她 提交于 2021-02-08 19:53:12
问题 I run a simple file test in perl with the code below: my $f1 = "$pre_file"; unless (-e $1) { print "\n Pre_check file does not exists! \n"; die; } It prints the following output: Pre_check file does not exists! Died at ./huawei-postcheck line 81. However I do not want the last line "Died at ./huawei-postcheck line 81.". I want to to "die" with no error message. Is it possible? 回答1: You could just say die "\n"; to suppress the message. 回答2: See the documentation for die. If the last element of

How to terminate the script in JavaScript?

由 北战南征 提交于 2020-02-08 19:43:28
问题 How can I exit the JavaScript script much like PHP's exit or die ? I know it's not the best programming practice but I need to. 回答1: JavaScript equivalent for PHP's die. BTW it just calls exit() (thanks splattne): function exit( status ) { // http://kevin.vanzonneveld.net // + original by: Brett Zamir (http://brettz9.blogspot.com) // + input by: Paul // + bugfixed by: Hyam Singer (http://www.impact-computing.com/) // + improved by: Philip Peterson // + bugfixed by: Brett Zamir (http://brettz9

Why do I need to localize $@ before using eval?

由 喜你入骨 提交于 2020-01-03 11:46:31
问题 I'm aware of the fact that $@ is a global variable, still I can't figure out why I need to localize it before using eval: For instance: eval { SOME_FUNC_THAT_MAY_DIE(); }; if ($@) { print "An error occured!\n"; } The only possible thing I can think of is, if some signal handler will call die at the same time I try to read $@ , what am I missing here? 回答1: The reason to say local $@ before calling eval is to avoid stepping on your caller's $@ . It's rude for a subroutine to alter any global

Can I catch exit() and die() messages?

由 坚强是说给别人听的谎言 提交于 2019-12-28 11:51:29
问题 I'd like to be able to catch die() and exit() messages. Is this possible? I'm hoping for something similar to set_error_handler and set_exception_handler . I've looked at register_shutdown_function() but it seems to contain no context for the offending die() and exit() calls. I realize that die() and exit() are bad ways to handle errors. I am not looking to be told not to do this. :) I am creating a generic system and want to be able to gracefully log exit() and die() if for some reason

MySQL update or insert or die query

由 天涯浪子 提交于 2019-12-24 10:12:58
问题 Is it valid to do something like this, I never see more than 1 or operator: $insert = 'INSERT into fhours (' .$cols . ') VALUES ('.$query.')'; $update = sprintf("UPDATE fhours SET %s WHERE fname='$fname' AND lname='$lname'", $field_list); $result = $db->query($update) or $db->query($insert) or die('uhoh');` 回答1: There are two problems with this. The first is that you can be using parameterized queries. Look at PDO, this will help you greatly. Not only is this faster for multiple inserts, but

How Can I Display Static HTML After I've Used die() in a PHP Block?

由 谁说胖子不能爱 提交于 2019-12-24 07:15:22
问题 Let's say I have some code like this: <html> <head><title>Title</title></head> <body> <?php if (!$someCondition){ die(); } else{ #Do something } ?> </body> <html> I hope the purpose of this code is straightforward. If a certain condition is met (ie can't connect to database), then the program should die, but otherwise it should execute. My problem arises when the die() function is executed. It stops right there, and sends only the first three lines to the browser, but not the last two lines.

Why doesn't die in alarm signal handler kill the process?

由 社会主义新天地 提交于 2019-12-23 19:02:10
问题 From How can I specify timeout limit for Perl system call? eval { local $SIG{ALRM} = sub { die "alarm\n" }; # NB: \n required alarm $timeout; $nread = sysread SOCKET, $buffer, $size; alarm 0; }; if ($@) { die unless $@ eq "alarm\n"; # propagate unexpected errors # timed out } else { # didn't } If a timeout happens, should sub { die "alarm\n" }; cause the end of a process. I guess I am not able to understand die . This http://www.cs.cf.ac.uk/Dave/PERL/node111.html says that "The die() function

CodeIgniter: View doesn't load if I use die() function

由 为君一笑 提交于 2019-12-23 12:17:32
问题 I have the following code. Checks if the user is logged in or not. When the variable $is_logged_in is not set or is False, I load a message view. Unfortunately, at the same time the system loads the restricted content view. So I used die() function, and now only shows a blank page. What can I do to only load the message view when the user is not logged in? Thanks. if(!isset($is_logged_in) OR $is_logged_in == FALSE) { $data['main_content'] = 'not_logged_in'; $data['data'] = ''; $this->load-

How can I make Perl die if a warning is generated?

由 半城伤御伤魂 提交于 2019-12-21 07:30:55
问题 I would like my script perl to die whenever a warning is generated, including warnings which are generated by used packages. For example, this should die: use strict; use warnings; use Statistics::Descriptive; my @data = ( 8, 9, 10, "bbb" ); my $stat = Statistics::Descriptive::Full->new(); $stat->add_data(@data); use warnings FATAL => 'all'; won't help since it's lexically scoped. Test::NoWarnings also doesn't do the work since it doesn't kill the script. 回答1: To add to rafl's answer: when
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