what’s the need for getopts shell builtin?
The 'getopts' command is a built-in tool in shell scripting. It helps in handling different types of input when working with scripts. It can process information in two ways: It…
Getting “command not found” when “Sudo cd” is executed?
madhu@madhu-Inspiron-5567:~$ sudo cd /root [sudo] password for madhu: sudo: cd: command not found If you encountered the mentioned error after running sudo with the "cd" command, it occurred because: The…
Delete a large number of files (best way to do this)?
Imagine having millions of small files within a directory. When attempting to delete files in the directory that match a specific pattern using the "rm -rf" command, or to remove…
VMware PowerCLI update root password in all ESXi Hosts?
Script to change a common password of all the ESXIs in a vCenter: #need to enter the current root password at command line $rootpswd = read-host "Please enter the current…
How to get info about VMs in vCenter/ESXi with a VMware PowerCLI script?
1) VMware PowerCLI Script using Linux PowerShell (pwsh-preview), which has the "VMware.PowerCLI" module installed. Connect-VIServer -Server myvcenter.mylearningsguru.com -User username -Password password New-VIProperty -Name VMToolsStatus -ObjectType VirtualMachine ` -ValueFromExtensionProperty 'Guest.ToolsStatus' `…
How to use the apt-get package management tool?
apt-get is a command-line tool in the Ubuntu OS used for installing, removing, upgrading, and updating packages. It can also be employed to upgrade the entire operating system. 1) Updating…
How to map docker container with a veth interface?
In certain scenarios, especially when numerous Docker containers are operational within a server host, it becomes pivotal to identify the specific veth interface associated with each container. This enables us…
About Bash Special variables and differences between $*, “$*”, $@, “$@”?
Bash scripts offer a range of special variables that prove incredibly valuable when handling arguments within a Bash script. $0 Prints filename of the script.$1, $2 ….. $n $1 is the…
Update a command in AWS instances (using ansible & ssh-agent)?
1) First, we need to start the ssh-agent (this program holds private keys for public key authentication) using the command.ssh-agent bash2) Now, we need to add the private key, along…
About PermitRootLogin and PasswordAuthentication in the sshd_config file?
PermitRootLogin: The PermitRootLogin options solely determine whether direct login as the root user via SSH to the server is permissible. The valid arguments for this directive are: no, yes, forced-commands-only,…