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The useradd command is used to create new user accounts in Linux. It has many options that can be specified to customize the user creation process. Two of these options are:
* -d, --home HOME_DIR: This option allows the user to specify the absolute path to the user's home directory. The default is to append the username to the base directory specified by the HOME variable in /etc/default/useradd, or /home by default. The directory does not have to exist but will not be created if it is missing12
* -u, --uid UID: This option allows the user to specify the numeric user ID (UID) of the user. The UID must be unique and not already in use by another user. The default is to use the next available UID from the range specified by the UID_MIN and UID_MAX variables in /etc/login.defs13 References: 1: useradd(8) - Linux man page 2: How to Create Users in Linux (useradd Command) | Linuxize 3: Linux Useradd Command Help and Examples - Computer Hope

The lpr command is a legacy program provided by CUPS for sending files to the printer queues on the command line. It is one of the Berkeley (lpr) printing commands that CUPS supports for compatibility with other Unix-like systems. The lpr command accepts one or more filenames asarguments and sends them to the default or specified printer. It also supports several options to control the printing process, such as the number of copies, the page size, the orientation, and the priority. The lpr command is equivalent to the lp command, which is one of the System V (lp) printing commands that CUPS also supports. However, the lp command has more options and features than the lpr command, and is recommended for use with CUPS. References:
* Command-Line Printing and Options - CUPS
* Command-Line Printer Administration - CUPS
* Linux cups tutorial for beginners - Linux Tutorials - Learn Linux ...
* CUPS Command-Line Utilities - Configuring and Managing ... - Oracle