Shell script to pass multiple arguments with options This tutorial will help you to pass multiple arguments in a more organized manner. I have used two arguments “t” and “d” here. The first argument “t” will accept task value and based on the task value you can perform the respective action for a particular date(“d”)….
Deleting Lines Containing Specific string from multiple files Deleting Lines Containing Specific string from multiple files recursively Syntax: Example: Below example delete lines containing @license tag from src/main/php directory all files recursively Option Description: -R or –dereference-recursive For each directory operand, read and process all files in that directory, recursively, following all symbolic links. -l…
Simple bash Script to get the list of files and directories inside the specified path Sometimes we want to get the list of files and directories recursively, but it is tedious to navigate each directory to check all the files. Here are the simple commands which will help you to check all the files and…
What is OpenCV? OpenCV (Open Source Computer Vision Library) is an Open Source Library for computer vision, machine learning and image processing. You can use OpenCV with multiple programming languages like Python, Java, C++. OpenCV can be used to process the images, identify objects, face detection, real-time traffic monitoring, lane detection for automation cars, text…
Install RPM in CentOS RPM Package Manager (RPM), originally called the Red-hat Package Manager, is a program to install or uninstall software packages or libraries in Linux. To install RPM in CentOS, first download the RPM: [roop@localhost ~]$ wget ftp://rpmfind.net/linux/centos/6.6/os/x86_64/Packages/opencv-2.0.0-12.el6.x86_64.rpm now check in your directory opencv-2.0.0-12.el6.x86_64.rpm will be available for installation.To install RPM in CentOS…
Here is the simple shell script to rename all files in the folder with increasing number. In below example I am going to rename all jpg image with increasing number. #!/bin/bash a=1 for i in *.jpg; do new=$(printf “%04d.jpg” “$a”) mv — “$i” “$new” let a=a+1 done Output: 0001.jpg 0002.jpg 0003.jpg 0004.jpg 0005.jpg 0006.jpg 0007.jpg…
Shell script to run mysql query from command line without login into mysql command prompt. You can use these shell script for quickly execution of MySQL query from a Linux Shell. Method 1: #!/bin/bash #Script to run mysql query from command line #Db Connection. DB_USER=’root’ DB_PASSWD=’mypwd’ DB_NAME=’mydb’ #Prepare sql query QUERY=’select * from employee’ #Command to connect…
Here is the simple shell script check the MySQL service status, if MySQL service is not running then start MySQL service. #!/bin/bash SERVICE=’mysql’ if ps ax | grep -v grep | grep $SERVICE > /dev/null then echo “$SERVICE service is running.” else echo “$SERVICE is not running” service mysqld start fi Let me describe about…
Apache Bench for Load Testing AB( Apache Bench) is a command line utility to measure performance of any web server. It’s originally designed to test the Apache HTTP server. AB is free open source software and distributed under the terms of the Apache License. It’s good practice to Benchmark performance of the any server before…
Siege is simple load testing and benchmarking tool. Siege support GET and POST method to test your webservers through cookies, HTTP , HTTPS and FTP protocols. You can test single or multiple web urls in a single test . Installation on Linux : Download latest version Siege from official website https://www.joedog.org/siege-home/. Current latest version is “siege-3.1.0”…
