enable firewall - sudo ufw enable reload firewall - sudo ufw reload disable firewall - sudo ufw disable allow port ya service - sudo ufw allow port/service-name (like - sudo ufw allow ssh or sudo ufw allow 22 or sudo ufw allow from sourceip to any port 22) allow rule delete - sudo ufw delete allow port/service-name (like - sudo ufw delete allow ssh or sudo ufw delete allow 22 or sudo ufw delete allow from sourceip to any port 22)
Author: Lalit Mohan Jaimini
install ffmpeg in ubuntu
sudo add-apt-repository ppa:jonathonf/ffmpeg-4 sudo apt-get update sudo apt-get install ffmpeg
Disable apache server status in ubuntu
sudo a2dismod status
sudo systemctl restart apache2.service
Use of Hindi (unicode) character from request parameter in java
String str = request.getParameter("sentence"); System.out.println("before convert - " + str); str = new String(request.getParameter("sentence").getBytes("ISO-8859-1"),"UTF-8"); System.out.println("after convert - " + str);
Round a double to any decimal places in java
int n = 2;
round(xxxx.xxxxx, n); // Return xxxx.xx
Create username password for apache tomcat user
sudo vi /opt/tomcat/conf/tomcat-users.xml
<role rolename="manager-gui"/> <user password="" roles="manager-script,admin" username=""/> <user password="" roles="manager-gui,manager-script,admin" username=""/>
then restart tomcat service
sudo systemctl restart tomcat.service
Failed to connect http://changelogs.ubuntu.com/meta-release
- sudo rm /var/lib/ubuntu-release-upgrader/release-upgrade-available
- sudo /usr/lib/ubuntu-release-upgrader/release-upgrade-motd
Switch to another user in linux
su username
Switch to root user in Linux
sudo -i
Show current user login in linux
whoami