ssh:tldr:06917

The command sshpass -f ${filename} ssh -o StrictHostKeyChecking=no ${user}@${hostname} "${command}" is used to connect to a remote host via SSH and execute a specific command on that remote host.

Let's break down the command into its individual components:

1. sshpass: It is a utility that allows providing SSH password non-interactively. It can be used to automate SSH logins.
2. -f ${filename}: This is an option for sshpass indicating that the password should be read from a file instead of specifying it directly in the command. ${filename} is a placeholder for the actual filename that contains the password.
3. ssh: It is the SSH command used for establishing a secure shell connection to a remote host.
4. -o StrictHostKeyChecking=no: This is an SSH option that disables strict host key checking. It means that the SSH client won't prompt for confirmation when connecting to a new host, assuming the host key is not recognized.
5. ${user}@${hostname}: These are placeholders for the actual username and hostname of the remote host you want to connect to. They should be replaced with the appropriate values.
6. "${command}": This is a placeholder for the actual command you want to execute on the remote host. It should be replaced with the desired command.

When you run the whole command, sshpass will supply the password from the specified file, and ssh will establish a connection to the remote host using the provided username and hostname. The specified command will then be executed on the remote host. The -o StrictHostKeyChecking=no option is used to bypass any prompt related to host key verification.