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  1. Introduction

    Files and File Structure

  2. File Structure
  3. Configuration Files
  4. File Formats


  5. Filesystem Management
  6. File Management and Viewing
  7. Help, Job and Process Management
  8. Network Management
  9. System Management
  10. User Management
  11. Printing and Programming
  12. Document Preparation
  13. Miscellaneous
  14. Credits

Linux User Management

acPrint statistics about users' connect time.
acctonTurn on accounting of processes. To turn it on type "accton /var/log/pacct".
adduserEx: adduser mark - Effect: Adds a user to the system named mark
chageUsed to change the time the user's password will expire.
chfnChange the user full name field finger information
chgrpChanges the group ownership of files.
chownChange the owner of file(s ) to another user.
chpasswdUpdate password file in batch.
chrootRun command or interactive shell with special root directory.
chshChange the login shell.
edquotaUsed to edit user or group quotas. This program uses the vi editor to edit the quota.user and files. If the environment variable EDITOR is set to emacs, the emacs editor will be used. Type "export EDITOR=emacs" to set that variable.
faillogExamine faillog and set login failure limits.
fingerSee what users are running on a system.
gpasswdAdminister the /etc/group file.
groupaddCreate a new group.
grpckVerify the integrity of group files.
grpconvCreates /etc/gshadow from the file /etc/group which converts to shadow passwords.
grpunconvUses the files /etc/passwd and /etc/shadow to create /etc/passwd, then deletes /etc/shadow which converts from shadow passwords.
groupdelDelete a group.
groupmodModify a group.
groupsPrint the groups a user is in
idPrint real and effective user id and group ids.
lastDisplay the last users logged on and how long.
lastbShows failed login attempts. This command requires the file /var/log/btmp to exist in order to work. Type "touch /var/log/btmp" to begin logging to this file.
lastcommDisplay information about previous commands in reverse order. Works only if process accounting is on.
lastlogFormats and prints the contents of the last login.
lognamePrint user's login name.
newgrpLets a suer log in to a new group.
newusersUpdate and create newusers in batch.
passwdSet a user's pass word.
pwckVerify integrity of password files.
pwconvConvert to and from shadow passwords and groups.
quotaDisplay users' limits and current disk usage.
quotaoffTurns system quotas off.
quotaonTurns system quotas on.
quotacheckUsed to check a filesystem for usage, and update the quota.user file.
repquotaLists a summary of quota information on filesystems.
saGenerates a summary of information about users' processes that are stored in the /var/log/pacct file.
smbclientWorks similar to an ftp client enabling the user to transfer files to and from a windows based computer.
smbmountAllows a shared directory on a windows machine to be mounted on the Linux machine.
smbpasswdProgram to change users passwords for samba.
suEx: su mark - Effect: changes the user to mark, If not root will need marks password.
suloginSingle user login.
ulimitA bash builtin command for setting the processes a user can run.
useraddCreate a new user or update default new user information.
userdelDelete a user account and related files.
usermodModify a user account.
usersPrint the user names of users currently logged in.
utmpdumpUsed for debugging.
vigrEdit the password or group files.
vipwEdit the password or group files.
wDisplay users logged in and what they are doing.
wallSend a message to everybody's terminal.
whoDisplay the users logged in.
whoamiPrint effective user id.