Which command is used to modify user accounts?

The command used to modify user accounts is usermod. This command allows system administrators to make various changes to existing user accounts. With usermod, you can perform tasks such as changing a user's home directory, updating their login shell, adding or removing them from groups, or modifying their account expiration date. The ability to make this range of modifications distinguishes usermod as the go-to tool for altering the settings of user accounts on a Linux system.

In contrast, the other commands have more specific functions. The passwd command is primarily used to change a user's password, while adduser is intended for creating new user accounts. The groupmod command is designed for modifying existing groups, not users. Understanding the specific capabilities of these commands helps in effectively managing user accounts within a Linux environment.