Create a Perl file with the following script that takes the filename from the user, and check whether the file is empty or not using the “-z” file test operator. If the operator returns true, a line of text will be written into the empty file. Otherwise, a message will be printed....
Also remember that if the path or folder name contains a space, you need to surround the entire path in quotes. Single quotes or double quotes will work the same if there are no "expandable" parts in the path or folder name, but the slightly safer choice is single quotes. This is what...
1.master 服务器安装yum依赖包 yum install perl perl-devel perl-Time-HiRes perl-DBI perl-DBD-MySQL 1. 2.安装percona-toolkit工具包 wget http://www.percona.com/get/percona-toolkit.tar.gz tar zxf percona-toolkit-2.2.13.tar.gz cd percona-toolkit-2.2.13 perl Makefile.PL make && make install...
Check if the directory still exists The -d operator allows you to test if a file is a directory. For example, to check if the /etc/filetocheck directory exists, you can use: NOTE: You can also use double brackets [[ instead of [ single brackets. Check if the file doesn’t exist C...
The following program checks if the file "hello.txt" exists or not.<?php $filename = 'hello.txt'; if (file_exists($filename)) { $message = "The file $filename exists"; } else { $message = "The file $filename does not exist"; } echo $message; ?> ...
Check if drive exists, If not map Check if Email address exists in Office 365 and if exists, Create a Unique Email address Check if event log source exists for non admins Check if file created today and not 0 KB Check if HyperThreading is enabled Check if IIS running on a remote serve...
Learn how to check if a column exists in a Pandas DataFrame with this step-by-step guide and examples.
if( $mainstring =~ m'/systemfile(16|32)\.elf$' ) { say" Found the string"; } does the job. For your informations : $string =~ m' ... ' is the same than $string =~ / ... / One of the most beneficial aspects of the Perl language is its ability to verify strings using ...
# perl Makefile.PL (安装到非缺省目录 perl Makefile.PL PREFIX=${HOME}) # make # make test # make install 【2】pt-table-checksum学习 (2.1)pt-table-checksum简介 pt-table-checksum是著名的percona-toolkit工具集的其中一种工具。它是一个在线验证主从数据一致性的工具,主要用于以下场景: ...
<If path = "*.pl"> PathCheck fn="check-request-limits" max-rps="10" monitor="perl:$ip" </If> <If path = "*.jsp"> PathCheck fn="check-request-limits" max-rps="5" monitor="jsp:$ip" </If> The following example limits any one client IP to no more than 5 connections at a...