SCP uses Secure Shell (SSH) to transfer data between client and remote server, it’s fast and secure. In this article, we will show you two common SCP copying examples : Copying data from your computer to remote server. Copying data from remote server to your computer. 1. Copying data to Remote Server Example 1.1 – […]
I was recently in a situation of having to change some text that appeared in a bunch of config files that were inside nested sub-directories. Not having time to dust off 10-year old perl skills, I was looking for some shell commands that would work. Surprisingly, there are many examples on the web that do […]
In *nix, you can use the find command to find a file easily. $find {directory-name} -name {filename} 1. Find a file in the root directory If you have no idea where the file is located, you can search the entire system via the “/” root directory. Below example shows you how to find a file, […]
In J2EE web development, Web Application Archive(WAR) file is just a normal JAR file, which consists all of your web application components like, servlets, Java classes, libraries, resources and etc. Read Wiki for detail. Problem Current web application WAR file is generated via Ant or Maven tool, copy to *nix environment for deployment, but no […]
Often times, as server administrator, have to telnet or SSH to their server to restart the Apache Http services. The Apache http services are usually located at the following location, 1) init.d start script folder. issue “./apache restart” to restart it debian:/etc/init.d# ./apache restart Forcing reload of web server (apache)… waiting . debian:/etc/init.d# 2) usr/local/apache/bin […]
It is very easy to encrypt a text file in Linux, VIM text editor can be used to achieve it.. vim -x [file name] mkyong@snake ~]$ vim -x mkyong.txt This will prompt us to enter encryption key (password) Enter encryption key : ****** Enter same key again: ****** After that, key in the text data […]
The wget is a useful command to download a website in Linux. For example , wget [url]. [mkyong@snake ~]$ wget -r -p -k -E http://www.google.com –2009-07-19 14:07:27– http://www.google.com/ Resolving www.google.com… 64.233.189.104 Connecting to www.google.com|64.233.189.104|:80… connected. HTTP request sent, awaiting response… 302 Found Location: http://www.google.com.my/ [following] –2009-07-19 14:07:27– http://www.google.com.my/ Resolving www.google.com.my… 64.233.189.147 Connecting to www.google.com.my|64.233.189.147|:80… connected. […]
As Unix / Linux server administrator, we always need to know when is our last rebooted date and time. Actually, we are able to list out the system rebooted history by issue following command. last reboot Output mkyong@mkyong:~$ last reboot reboot system boot 2.6.28-11-generi Thu Jul 16 21:42 – 23:46 (02:04) reboot system boot 2.6.28-11-generi […]
Often times, we need to monitor our Linux server memory usage, “watch” is a handy command to display the real-time memory usage in Linux. NAME watch – execute a program periodically, showing output fullscreen We can issue the following command to keep track the real time memory usage in Linux. watch -d free -m The […]
CPULimit is a simple program to limit the CPU usage of certain application in Linux. It’s reside in the Ubuntu repositories by default. We can install it by issue the following command in Ubuntu sudo apt-get install cpulimit Output mkyong@mkyong:~$ sudo apt-get install cpulimit [sudo] password for mkyong: Reading package lists… Done Building dependency tree […]
In some cases, we want to find files that older than certain year , let say 1 year, we can use the -mtime +1 argument. In other hand, if we want to find files that older than certain minute, let say 1 minute, we can use -mmin +1 argument. man find find the following statement […]
The “dmidecode” is a handy tool in Linux to display the hardware specification detail. For example, memory, processor , BIOS and etc. man dmidecode DMI TYPES The SMBIOS specification defines the following DMI types: Type Information —————————————- 0 BIOS 1 System 2 Base Board 3 Chassis 4 Processor 5 Memory Controller 6 Memory Module 7 […]
In Unix system like Debian, Ubuntu or Red Hat, It is possible to set a static IP address with ifconfig command. My current Debian system IP address is 10.70.0.61 mkyong:~# ifconfig eth0 Link encap:Ethernet HWaddr 00:15:17:1D:CE:2F inet addr:10.70.0.61 Bcast:10.70.3.255 Mask:255.255.252.0 I want change it to 10.70.0.66, just issue following command to set a static IP […]
Today my boss ask me install a tomcat in linux machine. After i ssh into that machine, i wonder what is the Linux distribution version? Red Hat? Ubuntu? Fedora? Debian? However with a simple command, i can check what is linux distribution version mymachine:~# cat /proc/version Linux version 2.6.18-5-686-bigmem (Debian 2.6.18.dfsg.1-13etch3) ([email protected]) (gcc version 4.1.2 […]
hmm… linux whatever also in command line, it really make me uncomfortable, i even need to issue a command to check a directory size. du -lh P.S always issue -h to display file size in human readable format We can check summary of a directory by issuing du -sh
Command is simple, here i provide two samples to show how to copy entire directory in linux. cp -r sourcedir targetdir for instance, 1) Copy anything from current directory to /usr/local/download cp -r * /usr/local/download 2) Copy whole directory (include content) /usr/local/fromdownload to target /usr/local/download cp -r /usr/local/fromdownload /usr/local/download
A very useful Java code, to open a web browser from Java application in windows or Linux. package com.mkyong; public class StartBrowser { public static void main(String args[]) { String url = "http://www.google.com"; String os = System.getProperty("os.name").toLowerCase(); Runtime rt = Runtime.getRuntime(); try{ if (os.indexOf( "win" ) >= 0) { // this doesn’t support showing urls […]
Fedora you are strong !!! Here i share a bit funny stuff, regarding when i reset my postgres user password in fedora core 8. Please view below picture. Actually i just want to set a easy remember password for user postgres. However i unable to do it. First i enter password as “password” Fedora : […]
Default VI for Ubuntu is suck, i have to go install a full package of vi myself. However when i try to compile the vi source code, i hit following error error: C compiler cannot create executables It’s cause all my gcc compiler error, hmm…Ubuntu, why you have so many problem? Compiler also hit error….. […]
So, how much is my hard disk size left? To check file sizes in *nix system, use the command df -h df -h
Often time, you may need to know which file contains large file size, and delete it to save space. Here’s a code pattern to show you how to find large file size on Linux : find {directory} -type f -size +100000k -exec ls -lh {} \; | awk ‘{ print $9 ": " $5 }’ […]
Just issue following command to check your ip address in linux /sbin/ifconfig ya, my ip address now is 10.0.0.6
How to install java jdk on fedora core? here i provide few steps to demonstrate how it’s work. Installation Setup 1 ) Please visit sun java website to download any java jdk version you like. http://java.sun.com/javase/downloads/index.jsp 2 ) Click download, select Linux platform, language and accept license and continue. 3 ) Select “Linux RPM in […]
