User activity logs in linux

Log user activity for the last 24 hours by terminal

How can I log the activity of users for the last 24 hours by terminal in a system? Which command will give me this information?

3 Answers 3

• ~/.bash_history will show the commands that was used by a user.
• Install acct : sudo apt-get install acct in addition to login/logout. It provides logs of every single command run by every single user. Below mentioned commands are the features of acct
  • ac print statistics about connect time
  • accton turns accounting on or off
  • last list last logins of users and terms
  • lastcomm list last commands executed
  • sa print accounting statistics
  • dump-acct print accounting file in human-readable form

  The «last» command is designed to give you this information.

  laptop:~% last userx pts/0 :0.0 Mon Sep 3 11:31 still logged in userx pts/0 :0.0 Mon Sep 3 11:30 - 11:30 (00:00) userx pts/0 :0.0 Mon Sep 3 11:30 - 11:30 (00:00) userx pts/4 :0.0 Mon Sep 3 11:25 still logged in userx pts/2 :0.0 Mon Sep 3 11:23 - 11:28 (00:05) userx pts/2 :0.0 Mon Sep 3 11:20 - 11:20 (00:00) root pts/1 :0.0 Mon Sep 3 11:19 - 11:28 (00:09) root pts/1 :0.0 Mon Sep 3 11:19 - 11:19 (00:00) userx pts/0 :0.0 Mon Sep 3 11:10 - 11:12 (00:01) root pts/1 :0.0 Mon Sep 3 11:05 - 11:10 (00:04) userx pts/3 :0.0 Mon Sep 3 10:18 still logged in wtmp begins Mon Sep 3 10:18:35 2012 

  However as far as I know, there is no option to restrict the lookup to the last 24 hours.

  The who command Shows who is currently logged in to the system and information such as the time of the last login. You can use options such as -H (display column headings) -r (current runlevel) -a (display information provided by most options).

  The ‘w‘ command Displays information about the users currently on the machine and their processes. The first line includes information on the current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

  The last command displays a list of users who logged in and out since the /var/log/wtmp file was created. The last command searches back through the /var/log/wtmp file (or the file designated by the -f option) and displays a list of all users who have logged in (and out) since the file was created. You can specify names of users and TTY’s to show only information for those entries.

  The lastlog command formats and prints the contents of the last login log file (/var/log/lastlog). The login name, port, and last login time are displayed.

  Entering the command without options displays the entries sorted by numerical ID. You can use options such as -u login_name (display information for designated user only) and -h (display a one-line help message). If a user has never logged in, the message Never logged in is displayed in place of the port and time. For example, entering lastlog returns information similar to the following:

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  How to View and Configure Linux System Logs on Ubuntu 20.04

  This tutorial explains the basic administration of a Linux server through system logs. A system log is a file that contains information about the events that happened on the system during runtime.

  In this article, you will learn the following Linux logging basics:

  • Where the Linux log files are stored, how are they formatted, and how to read them.
  • How to read the most important logs (such as syslog ).
  • How to configure the Ubuntu syslog daemon.
  • What Linux log rotation is all about and how to use the logrotate utility.

  Prerequisites

  Before proceeding with the rest of this tutorial, ensure that you have a basic knowledge of working with the Linux command line. While many of the concepts discussed in this article are general applicable to all Linux distributions, we’ll be demonstrating them in Ubuntu only so ensure to set up an Ubuntu 20.04 server that includes a non-root user with sudo access.

  🔭 Want to centralize and monitor your Linux logs?

  Head over to Logtail and start ingesting your logs in 5 minutes.

  Step 1 — Finding Linux system logs

  All Ubuntu system logs are stored in the /var/log directory. Change into this directory in the terminal using the command below:

  You can view the contents of this directory by issuing the following command:

  You should see a similar output to the following:

  alternatives.log auth.log btmp cloud-init-output.log dmesg dpkg.log journal/ landscape/ private/ ubuntu-advantage-license-check.log ubuntu-advantage-timer.log unattended-upgrades/ apt/ bootstrap.log cloud-init.log dist-upgrade/ dmesg.0 faillog kern.log lastlog syslog ubuntu-advantage.log ufw.log wtmp 

  Let’s look at a few of the essential system log files that may be present in the /var/log directory and what they contain:

  • /var/log/syslog : stores general information about any global activity in the system.
  • /var/log/auth.log : keeps track of all security-related actions (login, logout, or root user activity).
  • /var/log/kern.log : stores information about events originating from the Linux kernel.
  • /var/log/boot.log : stores system startup messages.
  • /var/log/dmesg : contains messages related to device drivers.
  • /var/log/faillog : keeps track of failed logins, which comes in handy when investigating attempted security breaches.

  The /var/log directory is also used to store various application logs. For example, if your distribution is bundled with Apache or MySQL, or installed later, their log files will also be found here.

  Step 2 — Viewing Linux log file contents

  Log files contain a large amount of information that are useful for monitoring or analyzing activities performed by the system or a specific application. Therefore, a Linux server administrator must learn the art of reading and understanding the various messages present in log files to effectively diagnose or troubleshoot an issue.

  Before we can read log files, we ought to know how they are formatted. Let’s review two basic approaches to log file formatting and storage: plain text and binary files.

  Plaintext log files

  These logs are plain text files with a standardized content format. Ubuntu uses a log template called RSYSLOG_TraditionalFileFormat . This log format consists of four main fields with a space delimiter:

  1. The timestamp indicates the time when a log entry was created in the format MMM dd HH:mm:ss (e.g. Sep 28 19:00:00 ). Notice that this format does not include a year.
  2. Hostname is the host or system that originally create the message.
  3. Application is the application that created the message.
  4. Message contains the actual details of an event.

  Let’s go ahead and review some log files in the plaintext format. Run the command below to print the contents of the /var/log/syslog file with the tail utility:

  This outputs the last 10 lines of the file:

  Mar 23 12:38:09 peter dbus-daemon[1757]: [session uid=1000 pid=1757] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.1' (uid=1000 pid=1754 comm="/usr/libexec/tracker-miner-fs " label="unconfined") Mar 23 12:38:09 peter systemd[1743]: Starting Tracker metadata database store and lookup manager. Mar 23 12:38:09 peter dbus-daemon[1757]: [session uid=1000 pid=1757] Successfully activated service 'org.freedesktop.Tracker1' Mar 23 12:38:09 peter systemd[1743]: Started Tracker metadata database store and lookup manager. Mar 23 12:38:40 peter tracker-store[359847]: OK Mar 23 12:38:40 peter systemd[1743]: tracker-store.service: Succeeded. Mar 23 12:39:01 peter CRON[359873]: (root) CMD ( [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /usr/lib/php/sessionclean; fi) Mar 23 12:39:23 peter systemd[1]: Starting Clean php session files. Mar 23 12:39:23 peter systemd[1]: phpsessionclean.service: Succeeded. Mar 23 12:39:23 peter systemd[1]: Finished Clean php session files. 

  You’ll notice that that each record in this file is formatted in the manner described earlier. For example, the last record has its timestamp as Mar 23 12:39:23, hostname as peter, application as systemd[1] and message as Finished Clean php session files.

  If you want to view the entire log file, you can use the cat utility or any text editor such as nano or vim .

  Binary log files

  While plaintext is the dominant storage format for log files, you will also encounter binary log files that cannot be read with a normal text editor. The /var/log directory contains multiple binary files that are related to the user authorization:

  • /var/log/utmp : tracks users that are currently logged into the system.
  • /var/log/wtmp : tracks previously logged in users. It contains a past data from utmp .
  • /var/log/btmp : tracks failed login attempts.

  For these binary logs, special command-line tools are used to display the relevant information in human-readable form. For example, to review the contents of the /var/log/utmp file, run the who utility with -H option (this option causes column labels to be printed in the output table):

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