Definition: The 'shadow' command in shell scripts, /etc/shadow, is used to store a user's password hash. Specifically: - The leading `:` at the end indicates that this command reads from a file called `/etc/shadow`. - The `-d` flag enables debugging mode (if available), which prints out command output for debugging purposes. - The shell stores each line of the contents in the `.` block, one per line. - Each line has three fields: `:`, `:` and `:`. - The first field is a string that represents the hash value of the password. - The second field holds the user's name. - The third field is used to store a timestamp indicating when the hash was generated (in UTC time). The command is typically used for storing passwords, but can also be used for other purposes like authentication or file permissions management. Detailed definition: - `:` at the end of `/etc/shadow` indicates that this command reads from a file called `/etc/shadow`. - `-d` flag enables debugging mode (if available), which prints out command output for debugging purposes.
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