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LINUX USER COMMANDS AND FILES

useradd name = Create a user account. By default, when you create a user account, you create a home directory for that user with the same name under /home/username.

useradd -c text name = Add a description for the account in the GECOS field of /etc/passwd. Example: useradd -c “Paul Morrill” pmorril creates the pmorril account with a comment

useradd -d path name = Assign an absolute pathname to a custom home directory location. Example: useradd -d /tmpusr/sales1 sales1 creates the sales1 user account with home directory located at /tmpusr/sales1

useradd -u ID name = Assign the user a custom UID. This is useful if you want to assign ownership of files and directories to a different user. Example: useradd -u 789 dphilips creates the dphilips account with user ID 789

usermod name = Modify an existing user account. usermod uses the same switches as useradd.. Example: usermod -c “Paul Morril” pmorril changes the comment field for user pmorril

usermod -l newname name = Rename a user account. When renaming the account, use the -d switch to rename the home directory, and use the -m switch to copy all files from the existing home directory to the new home directory. Example: usermod -l esmith -d /home/esmith -m ejones renames the ejones account to esmith, renames the home directory, and moves the old home directory contents to the new location

usermod -s path name = Modifies the default shell setting for the user account.
Example: usermod -s /bin/tsch esmith points the shell for esmith to /bin/tsch

userdel name = Remove the user from the system. Example: userdel pmaxwell deletes the pmaxwell account while leaving the home directory on the system

userdel -r name = Remove the user and the user’s home directory. Example: userdel -r pmorril removes both the account and the home directory