This article guides you to resize the EBS volume without rebooting 1. Modify volume in AWS EC2 UI After login to AWS console, navigate to EC2 -> Elastic Block Store -> Volumes. Click on the volume that you wist to resize, then select Actions -> Modify Volume. It will open a popup. i) Enter the new size in the size field. Lets says we are resizing from 8 GB to 150 GB. ii) Click Modify button iii) Click Yes button in the confirm popup. Now the volume has been resized, but it won't reflect in the system. We need to do some more steps to make it work. 2. Resize the partition Let ..read more

 There are some situations where you may need to clear or purge all messages from a queue.  Using Command Line: You can purge or clear a queue with the following command: syntax: $ rabbitmqctl purge_queue queue_name Purge Queue from the Web UI Click on the Queues tab. Click on the name of the queue that you want. Expand the “Purge” section. Click the “Purge Messages” button. Click “OK”. Purging all queues  $ rabbitmqadmin -f tsv -q list queues name > list1.txt $ for i in `cat list1.txt`; do rabbitmqctl purge_queue "$i" ; done  ..read more

 What is XAMPP? XAMPP is the most popular PHP development environment. XAMPP is a completely free, easy to install Apache distribution containing MariaDB, PHP, and Perl. Download the latest version from here wget https://www.apachefriends.org/xampp-files/7.4.16/xampp-linux-x64-7.4.16-0-installer.run After download change the permission : chmod 755 xampp-linux-x64-7.4.16-0-installer.run sudo ./xampp-linux-x64-7.4.16-0-installer.run If it linux server Press all Yes during installation.  If it is the desktop version of linux press next during installation.  Now need to c ..read more

 Wall displays the contents of a file or, by default, its standard input, on the terminals of all currently logged-in users. The command will cut over 79 character long lines to new lines. Short lines are white space padded to have 79 characters. The command will always put the carriage return and new line at the end of each line. Only the super-user can write on the terminals of users who have chosen to deny messages or are using a program that automatically denies messages. Reading from a file is refused when the invoker is not a superuser and the program is suid or sgid. Usually, sy ..read more

 In ubuntu By default python version was 2.7. We need to use python3 to run the python files with the latest version. Steps to change the default python version to 3 Check the current version  #python --version Python 2.7.17 Execute this command to switch to python 3.6.  #sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 1 Output: sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 1 update-alternatives: using /usr/bin/python3 to provide /usr/bin/python (python) in auto mode Check python version python --version Python 3.6 ..read more

Innotop is an efficient command-line monitoring tool for local and remote MySQL servers running under Innodb. It helps to monitoring several operations like MySQL replication status, user statistics, query list, InnoDB buffers, InnoDB I/O information etc. To Install Innotop Run the following command to install Innotop In RedHat yum install innotop In Ubuntu Fetch innotop from its GIT repository: Install Perl dependency: sudo apt install libterm-readkey-perl libclass-dbi-perl libclass-dbi-mysql-perl make  sudo apt-get install git git clone https://github.com/innotop/innotop.git ..read more

There are times when you need to know the file size of an HTTP object without actually downloading the file. This little trick comes in very handy when web servers respond with the Content-Length of an object in the HEAD request itself. Using curl command: Example: curl -sI https://releases.ubuntu.com/20.04.2.0/ubuntu-20.04.2.0-desktop-amd64.iso | grep Content-Length Content-Length: 2877227008 Let’s try and make this human-friendly: curl -sI https://releases.ubuntu.com/20.04.2.0/ubuntu-20.04.2.0-desktop-amd64.iso | grep Content-Length | sed 's/[^0-9]//g' | numfmt --to=si 2.9G Where Th ..read more

 #!/bin/bash -x  if [ $(id -u) -eq 0 ]; then read -p "Enter username : " username read -s -p "Enter password : " password egrep "^$username" /etc/passwd >/dev/null if [ $? -eq 0 ]; then echo "$username exists!" exit 1 else if [ -f /usr/bin/mkpasswd ]; then pass=$(mkpasswd -m sha-512 $password) #mkpasswd will create encrypted password. useradd -m -p "$pass" "$username" [ $? -eq 0 ] && echo "User has been added to system!" && chage -d0 $username  || echo "Failed to add a user!" else echo "install package apt-get install whois"        f ..read more

 how to check If the file Is Empty or not using shell script? -s FILE               FILE exists and has a size greater than zero Example 1: touch /$HOME/f1 echo "data" >/$HOME/f2 ls -l /$HOME/f{1,2} [ -s /$HOME/f1 ]  echo $? Sample outputs: 1 The non-zero output indicates that the file is empty. [ -s /$HOME/f2 ] echo $? Sample outputs: 0 $? is the return code of the last executed command. Example 2: $ ls $ touch file_1 $ dd if=/dev/zero of=$HOME/file_2 bs=1 count=100 100+0 records in 100+0 records o ..read more

 Input/Output Error : Bad Blocks - How to Reboot or shutdown the Linux server?   Input/output error while running the command mostly due to it could be bad blocks on the disk.  In this situation, first suggestion would be to check /var/log/messages for any disk-related alerts (might see some sense key alerts). tail -n 100 /var/log/messages or tail -n 100 /var/log/syslog tail -f /var/log/messages #du bash: /usr/bin/du: Input/output error Now if try to reboot,it can also give the same output. You can try to init 6. # reboot or init 6 bash: /sbin/reboot: Input/output e ..read more