perl

How do I return nothing from a subroutine?

由 末鹿安然 提交于 2020-01-29 17:46:31
问题 I want to validate a condition before doing the next step, but only raise a warning and skip the current value instead of die-ing. How do I rewrite validate_me() subroutine without returning any value? (Update) please note that the following code works as expected, it just that I want something else instead of returning 1 or 0 from validate_me() that still allow the code to behave the same. foreach my $file ( @files ) { validate_me($foo, $bar, $baz) or next; do_something(); } sub validate_me

How do I return nothing from a subroutine?

由 浪子不回头ぞ 提交于 2020-01-29 17:43:45
问题 I want to validate a condition before doing the next step, but only raise a warning and skip the current value instead of die-ing. How do I rewrite validate_me() subroutine without returning any value? (Update) please note that the following code works as expected, it just that I want something else instead of returning 1 or 0 from validate_me() that still allow the code to behave the same. foreach my $file ( @files ) { validate_me($foo, $bar, $baz) or next; do_something(); } sub validate_me

How to Replace white space in perl

由 怎甘沉沦 提交于 2020-01-29 09:40:07
问题 chomp($myString); $myString =~ s/\///g; can i replace those two with $myString =~ s/\s//g; are there any difference? Please explain. 回答1: Your first code will take a newline off the end of $myString if it exists and then remove all "/" characters. The second line of code will remove all whitespace characters. Is there a typo? Maybe you want to know you can replace this: chomp($myString); $myString =~ s/\s//g; with this: $myString =~ s/\s//g; If that's the question, then yes. Since a newline

How to Replace white space in perl

由 ∥☆過路亽．° 提交于 2020-01-29 09:39:45
问题 chomp($myString); $myString =~ s/\///g; can i replace those two with $myString =~ s/\s//g; are there any difference? Please explain. 回答1: Your first code will take a newline off the end of $myString if it exists and then remove all "/" characters. The second line of code will remove all whitespace characters. Is there a typo? Maybe you want to know you can replace this: chomp($myString); $myString =~ s/\s//g; with this: $myString =~ s/\s//g; If that's the question, then yes. Since a newline

Perl DBI insert multiple rows using mysql native multiple insert ability

由 家住魔仙堡 提交于 2020-01-29 06:14:45
问题 Has anyone seen a DBI-type module for Perl which capitalizes, easily, on MySQL's multi-insert syntax insert into TBL (col1, col2, col3) values (1,2,3),(4,5,6),... ? I've not yet found an interface which allows me to do that. The only thing I HAVE found is looping through my array. This method seems a lot less optimal vs throwing everything into a single line and letting MySQL handle it. I've not found any documentation out there IE google which sheds light on this short of rolling my own code

perl push an array to hash

由 。_饼干妹妹 提交于 2020-01-29 00:49:21
#!/usr/bin/perl use strict; use warnings; use Data::Dumper; my @array=qw /fm1 fm2 fm3 fm4 fm5 fm6/; print "\n\@array: @array\n\n"; my %hash; my $key1="gene1"; my $key2="gene2"; print "\$key1: $key1\n\$key2: $key2\n\n"; my @array1 = @array[0..2]; my @array2 = @array[3..5]; print "\@array1: @array1\n\@array2: @array2\n\n"; $hash{$key1}=\@array1; $hash{$key2}=\@array2; print Dumper(\%hash); @array: fm1 fm2 fm3 fm4 fm5 fm6 $key1: gene1 $key2: gene2 @array1: fm1 fm2 fm3 @array2: fm4 fm5 fm6 $VAR1 = { 'gene1' => [ 'fm1', 'fm2', 'fm3' ], 'gene2' => [ 'fm4', 'fm5', 'fm6' ] }; 来源： https://www.cnblogs

iOS逆向系列-theos

由 本秂侑毒 提交于 2020-01-26 23:28:01
概述 theos 是GitHub开源的一个项目，通过 nic.pl 创建 tweak 项目。通过编写我们注入代码，然后执行编译、打包、安装等操作将代码注入iPhone安装的制定程序。 theos环境配置 安装签名工具ldid 确保安装了 brew /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" 利用brew安装ldid $ brew install ldid 下载theos $ git clone --recursive https://github.com/theos/theos.git 由于theos依赖于其它的库所以我们使用 recursive 递归方式去clone自动下载锁依赖的库。我这里下载了~/目录下。 配置环境变量 为了是theos/bin目录下的命令全局有效，配置环境变量。 theos theos创建工程 cd到一个存放项目代码的文件夹(比如桌面) $ cd ~/Desktop $ nic.pl 选择【11.】iphone/tweak 填写项目信息 项目名称 项目ID(随便写) Author/Maintainer Name 作者 直接敲回车按照默认的做法就行(默认是Mac上的用户名) [iphone/tweak

Read specific text patterns in perl [closed]

由 前提是你 提交于 2020-01-26 04:11:23
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 3 years ago . I want to read from a text file only specific text, for example: FileExample: 1111111/first/second/third/fourth.c11111111...etc... 1111111/afirst/asecond/athird/afourth.c11111111...etc...etc I would like to read the whole file except the part of the file from the 3rd "1" from the first "/" until

I installed a module successfully with CPAN, but perl can't find it. Why?

由 空扰寡人 提交于 2020-01-26 01:16:25
问题 I installed a CPAN module like this: cpan Acme According to the output, the installation was successful: Running install for module 'Acme' ... All tests successful. Files=2, Tests=3, 0 wallclock secs ( 0.02 usr 0.00 sys + 0.04 cusr 0.00 csys = 0.06 CPU) Result: PASS INGY/Acme-1.11111111111.tar.gz /usr/bin/make test -- OK Running make install Manifying 1 pod document Installing /home/foo/perl5/lib/perl5/Acme.pod Installing /home/foo/perl5/lib/perl5/Acme.pm Installing /home/foo/perl5/man/man3

Cygwin: Perl script $ENV{PATH} call returns unix path. How do I change it?

由 不羁的心 提交于 2020-01-25 11:54:08
问题 I am calling a Perl script from cygwin. The issue that I am having is that when it calls $ENV{PATH}, the path is receives is a unix path. How do I change my shell so it returns a DOS path? 回答1: Cygwin is a Unix-emulation environment for Windows. It wouldn't work unless $PATH was a Unix-style path. If you want perl to give you a DOS path, use a DOS-compatible Perl, like Strawberry Perl. You can even run Strawberry Perl (or whatever Windows-build of perl you use) from Cygwin if you want to. 回答2
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