In this example, I will use the getent command to check if a Linux group exists. if getent group "$groupname" >/dev/null; then echo "Group $groupname exists" fi Replace $groupname with the name of the group you want to check. If you like to check if the group does not exist (e.g. because you like to ... Read more
Here I will show you how to check if a Linux user exists (or does not exist) in a POSIX-compatible shell like Bash or Dash. I will use the getent command along with the /etc/passwd file for this. Example Bash script: if getent passwd "$username" >/dev/null; then echo "User $username exists" else echo "User $username ... Read more
The bash history is a log file that contains all commands that a user executed on the Linux BASH shell. When you use the "arrow up" key on your keyboard, then Bash will look up the previous command from that file and display it on the screen. You just have to press "Enter" to execute ... Read more
Bash shell refers to Bourne Again Shell which can be found as the default shell in most of the Linux distributions. A Bash Script is a file where multiple shell commands are scripted to perform a particular task. If you are familiar with bash script then this article is for you, in this demonstration I ... Read more
To restart a Docker container, you can use the `docker restart` command. This command stops and then starts the specified container. Here's a step-by-step guide on how to restart a Docker container, along with command examples: List Running Docker Containers As the first step, you need to identify the container you want to restart. To ... Read more
To restart a CentOS system, you can use both the command line (shell) and the desktop environment (GUI). Using the Command Line (Shell) to restart CentOS Open a terminal: You can open a terminal in CentOS by pressing `Ctrl+Alt+T` or by searching for "Terminal" in the application menu. Alternatively, connect to the system using SSH ... Read more
When using a custom docroot in the custom Apache directives field in ISPConfig, the /stats folder becomes inaccessible. An easy way to make it accessible again is by using an alias. Add the following Apache directives into the custom directives field of the website in ISPConfig: Alias "/stats" "{DOCROOT_CLIENT}/stats" Thanks to Thom for providing the ... Read more
NFS (Network File System) is a distributed file system protocol developed by Sun Microsystems to share files and folders between Linux/Unix systems. NFS allows us to mount the file system over the local network. NFS uses standard client/server architecture for sharing files and directories between Linux-based systems. This tutorial will help you to set up ... Read more
If you run a firewall on your Linux server and want to use passive FTP connections, you have to define the passive port range in pure-ftpd and your firewall to ensure that the connections don't get blocked. The following example is for pure-ftpd on Debian or Ubuntu Linux and ISPConfig 3. Set Passive Port Range ... Read more
YARN package manager is a tool for managing yarn. The acronym stands for “Yet Another Resource Negotiator”, and that is what the package manager does: it negotiates with other packages to determine which will consume resources and when without user intervention. The design of this system was inspired by Node’s npm and Python’s pip, but ... Read more