Rahul Sahu

To change the SSH port on a Linux or Unix server, follow these steps: Open the SSH daemon configuration file: The SSH daemon configuration file is usually located at /etc/ssh/sshd_config. Find the line that specifies the Port: Look for the line that starts with Port and change the default port number (22) to the desired … Read more

You can find a process by its name in Linux using the ps and grep commands. Here’s an example of how to find a process by its name: ps -ef | grep process-name The ps -ef command lists all running processes on the system, and the grep command filters the output to show only the … Read more

Securing a MongoDB installation on a Linux or Unix production server involves several steps: Bind to a specific IP address or localhost: By default, MongoDB listens on all available network interfaces. To secure your MongoDB installation, you should bind MongoDB to a specific IP address or to localhost. This will limit access to your MongoDB … Read more

To change your shell in Linux or Unix, you can use the chsh (change shell) command. The chsh command allows you to change the default shell for your user account. Here’s an example of how to change your shell to bash: chsh -s /bin/bash The -s option specifies the shell to use, and /bin/bash is … Read more

The “command not found” error message you’re encountering indicates that the python command is not recognized by your shell because it is not in your shell’s PATH. Here are some steps you can take to resolve this issue: Check if Python is installed: python3 –version If Python is installed, the above command will display the … Read more

You can check the size of a file in Linux/Unix using the stat command. The stat command provides information about the file, including its size. Here’s an example of how to check the size of a file named file.txt: stat -c %s file.txt The -c option specifies the format for the output, and %s represents … Read more

You can append text to the end of a file in Linux using the echo command and the >> operator. The echo command outputs the specified text, and the >> operator appends the output to the end of the specified file. Here’s an example of how to append text to the end of a file … Read more

If your MacOS keeps asking for the passphrase for your ssh key after an upgrade or a reboot, there are a few possible solutions: Use ssh-add to add the key to the ssh-agent: eval “$(ssh-agent -s)” ssh-add -K ~/.ssh/id_rsa The -K option stores the passphrase in the Keychain, so you won’t be prompted for it … Read more

In Linux or Unix, you can copy a single file to multiple directories using a loop in a shell script. Here’s an example script that uses the cp command to copy the file file.txt to multiple directories dir1, dir2, and dir3: #!/bin/bash directories=(dir1 dir2 dir3) file=file.txt for dir in “${directories[@]}”; do cp “$file” “$dir” done … Read more

You can force an ssh client to use only password authentication when public key authentication is also configured by using the -o PreferredAuthentications=password option when connecting to the server. For example: ssh -o PreferredAuthentications=password user@server This option tells ssh to only use password authentication and ignore any public key authentication that may be configured. The … Read more