whiptail:tldr:30c2e

This command is using the whiptail utility to display a password input dialog box and store the user's input in a variable called result_variable_name.

Here is the breakdown of the command:

• ${result_variable_name}: This is the name of the variable where the result of the whiptail command will be stored.

• "$(whiptail --title "${title}" --passwordbox "${message}" ${height_in_chars} ${width_in_chars} 3>&1 1>&2 2>&3)": This is a command substitution that captures the output of the whiptail command and assigns it to the result_variable_name variable. Let's break it down further:

  • whiptail --title "${title}" --passwordbox "${message}" ${height_in_chars} ${width_in_chars}: This invokes the whiptail utility with specific options to configure the password input dialog box. The ${title}, ${message}, ${height_in_chars}, and ${width_in_chars} variables are dynamically populated with their respective values.
  • 3>&1 1>&2 2>&3: These redirections are used to redirect file descriptor 1 (stdout) to file descriptor 2 (stderr) and file descriptor 2 (stderr) to file descriptor 1 (stdout). This is done to handle the 3rd file descriptor (3) as a temporary intermediate to swap the redirections, allowing the whiptail command to capture the user's input correctly.

Overall, this command opens a password input dialog using whiptail and stores the entered password in the result_variable_name.