-f sets the number of days after a password expires that an account is disabled (stored in the /etc/shadow file).
-e changes the user’s account expiration date (stored in the /etc/shadow file).-d changes a user’s home directory with -m added, the contents of the old directory are moved into the new one.-c changes the comment field in the /etc/passwd file.-b allows names that don’t comply with standards.-a used with -G appends the user to the specified group.Here are some quick explanations of the options that show the range of changes this command can make: The usermod command has so many options that the command almost run out of letters to express them. Let’s look at the long list of the options available with the usermod command and what they do. Instead of editing files, you run commands that modify the files making the needed changes for you. With sudo access, on the other hand, you can make just about any changes to user accounts and with usermod, you can do it easily. Sysadmins have to make these changes for them. In fact, neither can they remove their accounts or lock their accounts without root access. While users can change their own passwords, select a different default shell and make changes to their environment settings (like their search paths), they cannot-at least not without root privileges-add themselves to groups, change their usernames, modify their descriptive information in the /etc/passwd file or make other changes to their account configuration.
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