The gecos field, or GECOS field is a field of each record in the /etc/passwd file on Unix, and similar operating systems. On UNIX, it is the 5th of 7 fields in a record. It is typically used to record general information about the account or its user(s) such as their real name and phone number.

What is Adduser GECOS?

adduser will copy files from SKEL into the home directory and prompt for finger (gecos) information and a password. The gecos may also be set with the –gecos option. With the –disabled-login option, the account is created but will be disabled until a password is set.

How install GECOS Linux?

Methods to set GECOS/Comment field to user on linux

With useradd command use -c or –comment option to set GECOS/Comment for user. By using usermod command,you can also set or modify the GECOS field. In case,while creating the user you forgot to set GECOS for user. Then you can use usermod command.