14

The seq command in Linux is used to generate a sequence of numbers from FIRST to LAST in steps of INCREMENT1. The syntax for the seq command is:
seq [OPTION]... LAST or seq [OPTION]... FIRST LAST or seq [OPTION]... FIRST INCREMENT LAST In this case, the command seq 1 5 20 has three arguments: FIRST = 1, INCREMENT = 5, and LAST = 20.
This means that the command will produce numbers from 1 to 20 in steps of 5. The output will be:
1 5 10 15
The output will not include 20 because it is not a multiple of 5. The output will be printed on separate lines by default, unless a different separator is specified with the -s option2. References:
* Seq Command in Linux [Explained With Examples]
* seq Man Page - Linux - SS64.com - SS64 Command line reference

hostname
Explanation:
The hostname command is used to set the hostname of the local system. The hostname command can take a single argument, which is the new hostname to be assigned to the system. For example, to set the hostname to linux, one can run:
hostname linux
The hostname command can also be used without any arguments to display the current hostname of the system. For example, to show the current hostname, one can run:
hostname
The hostname command only changes the hostname temporarily, meaning that the original hostname will be restored after a reboot. To change the hostname permanently, one has to edit the configuration files that store the hostname information, such as /etc/hostname, /etc/hosts, /etc/sysconfig/network, etc. The exact files and commands may vary depending on the Linux distribution and the system initialization process. For more details, please refer to the web search results1 or the question answering results2. Reference:

groupadd, /usr/sbin/groupadd