", '90s space prison escape movie with freezing trap scene. They aren't portable, but that's what os.name and ifstatements are for. On most Linux systems, some of these fields will be blank. When/How do conditions end when not specified? rev2023.6.27.43513. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The material in this site cannot be republished either online or offline, without our permission. Please, @usr-- that question seems to be more restricted than this one, e.g., it specifies not to use, C user name in linux - get current user name, The cofounder of Chef is cooking up a less painful DevOps (Ep. It's a UNIX specific module (see, 2 remarks. How to get the uid from a username in Linux? This command shows whos logged in and what they are doing. Your email address will not be published. No need for eval there. Short story in which a scout on a colony ship learns there are no habitable worlds, Write Query to get 'x' number of rows in SQL Server. UNIX is a registered trademark of The Open Group. If theyve logged directly onto the Linux computer itself, thatll be pts/o, so look for :0 in the output from w . You dont need to use sudo to look into the /etc/passwd file. Tecmint: Linux Howtos, Tutorials & Guides 2023. Short story in which a scout on a colony ship learns there are no habitable worlds. Even if you dont have other people using your computer you might have created some accounts just to learn how to do it, or to learn and practice administration processes. To learn more, see our tips on writing great answers. Terminal: The name of the terminal or device where the user is logged in. tail: It is a command-line utility in Linux used to display the end (tail) of a file. for Linux and Windows) to get the current user's username? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, To help people answer your question, you'll need to be more specific about the error. In fact, why even include the pipe through awk? Will provide equivalent information (if available). This will take care of things like fork bombs. 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By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Just log as root, use "su - xxx", and see for yourself. if you tried the command before adding untrue comments, you would see that the. This led to the concept of user accounts. The command. How to save the current user to a variable. user People think there are no alternatives other other than these two commands, but we found that there are other ways to gather user information. How to print the current user and system name in Unix? By submitting your email, you agree to the Terms of Use and Privacy Policy. Are there any MTG cards which test for first strike? If you have sudo set up, try sudo whoami for example. $ ulimit -a Viewing system resource limits for the current user with the ulimit command To limit the max number of processes that a user can spawn, use the -u option. Use the standard Unix/Linux/BSD/MacOS command logname to retrieve the logged in user. BTW this is the best answer, not only for me personally but also to the purpose of the OP's question. If the user has changed their prompt to some other format we need to try something else. Again, the first user accounts listed belong to processes, not humans. for Linux and Windows) to get the current user's username? # 1 02-21-2009 steveu Registered User 6, 0 grep current user I'm trying to write a grep command that will be good for the current user of the command but it doesn't work on my server with bash shell. The last command displays a list of the most recent login sessions, which includes information about the users who have logged in, their login times, and the terminals or remote hosts they used for login. WebI installed Bash and set up the user on normally. To get a users account details, use the passwd database and the username as follows. The users are listed and were returned immediately to the command prompt. Linux and Unix, Open Source, Linux Howtos. "current username" is slightly ambiguous. You can use the following function to get current user name is Linux. The first line RELATED: How to Use Regular Expressions (regexes) on Linux. Press Enter to run the command. uid=2000(anotheruser) gid=2000(anothergroup) groups=2000(anothergroup),3000(somegroup). $ pri What Is Whoami Php? This will select the entry and print the HOME directory: For more complex (remote) systems, getent is the usual command to get users information from the NSS (Name Service Switch libraries) system. in simpler systems ~user should be enough. On Solaris you have problems with methods, described above: id prints the user id along with the groups. The finger command is used to search for information about a user on Linux, which After over 30 years in the IT industry, he is now a full-time technology journalist. Linux keeps track of these two values using configuration parameters called UID_MIN and UID_MAX . We didnt even have to type a thing. When root (sudo) permissions are required, which is usually 90%+ when using scripts, the methods in previous answers always give you root as the How well informed are the Russian public about the recent Wagner mutiny? The name grep stands for Global Regular Expression Print. From a security point of view, it is bad practice to keep user accounts that you no longer need to be configured and accessible on your computer. ocp pts/0 64.104.125.239 Wed Jan 26 08:59 09:09 (00:10). When root (sudo) permissions are required, which is usually 90%+ when using scripts, the methods in previous answers always give you root as the answer. What is SSH Agent Forwarding and How Do You Use It? Thatll give us the number of real user accounts. How To List Users and Groups on Linux devconnected How to List Users in Linux {4 Methods Explained} - phoenixNAP The following Linux commands can be used to check logged-in users. How to get current user name of Linux in Java - Stack Overflow On the command line, enter whoami I also feel like having "domain/user" could be helpful in certain applications in Windows. How would you say "A butterfly is landing on a flower." When you've heard a command but aren't sure how to use it, checking. 0 for root). C user name in linux - get current user name Ask Question Asked 6 years, 4 months ago Modified 6 years, 4 months ago Viewed 450 times 0 I would like to import Linux >"At least as useful" Agreed. Two commands: id prints the user id along with the groups. User information can be queried using these six methods: The id command stands for identity. Alternative to 'stuff' in "with regard to administrative or financial _______. This can be useful when youre writing a script that needs to do something to a lot of user accounts. The login user is not exactly what the poster asked for but it is what I was looking for. Multiple boolean arguments - why is it bad? Resultant commit message in my personal gitlab looks like this:-. On most Linux systems, simply typing whoami on the command line provides the user ID. ocp pts/0 Jan 26 12:05 (64.104.125.239). Your email address will not be published. By comparison, the whoami command provides a very pithy answer: You can get the same one-word answer by echoing the $USER environment variable to the screen. if you want to be able to define your own user, I recommend creating a -u/--user flag so you can do something like, As the others said, the result you are getting is not wrong. You can also subscribe without commenting. The current iteration of your user name will be shown. Highlight a Row Using Conditional Formatting, Hide or Password Protect a Folder in Windows, Access Your Router If You Forget the Password, Access Your Linux Partitions From Windows, How to Connect to Localhost Within a Docker Container, How to Run Your Own DNS Server on Your Local Network. The finger command is used to search for information about a user on Linux, which includes detailed information about a specific user or a list of users, including their login name, real name, terminal, idle time, login time, and other relevant details. ", US citizen, with a clean record, needs license for armored car with 3 inch cannon. Usually, the regular human user accounts start at 1000, and the system, non-human, user accounts start at 0. Clarify the question, please. How can I do this? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to make Python get the username in windows and then implement it in a script, Get environment variable for current user and for all users in Python, Getting current userid and password in windows. This means youll also see the entries for user accounts that are owned by processes and the system, not by people. During his career, he has worked as a freelance programmer, manager of an international software development team, an IT services project manager, and, most recently, as a Data Protection Officer. We select and review products independently. by using cut, like so: You can use eval to get someone's home directory. rev2023.6.27.43513. @muru - that's true - and is spec'd behavior. Thats it! How do precise garbage collectors find roots in the stack? This file is a configuration file containing a set of rules that defines each user or group that is allowed to run commands with sudo access. If the user doesn't exist, getent will return an error. Chdir fails even though the user has a home directory assigned, vsftpd: permit the user see only her/his home directory, Compare path with user home and determine if first directory is ".nvm", How to give users acces to some other home directories. Please keep in mind that all comments are moderated and your email address will NOT be published. Their files are kept in an area that is private to each user. To collect information on a specific user, use the id command followed by the specific username as shown below: If you want to print multiple user information simultaneously using the id command, use the following small shell script. It is always important to know who has logged into your Linux box. Some people suggest that getting the username under Windows can be complicated in certain circumstances (e.g., running as a Windows service). With this method, an attacker can easily fake their username. Are there any MTG cards which test for first strike? Great point about access control but there are, @hithwen That's working as intended. By default, Linux distributions have the username in the prompt. `user3` logged in on `pts/1` since Wed Jun 23 15:20 and logged out on Thu Jun 24 09:00. To set v2 as the default version for future Group ID (GID): The numerical identification assigned to the users primary group. Hence, we have created this article to guide you. whoami The whoami command shows you which user account youre logged in to from a terminal window. This isn't secure, depending on system config. We can tell it to list the entries in the /etc/passwd file by using passwd as a parameter. The current user's username can be gotten in pure Bash with the ${parameter@operator} parameter expansion (introduced in Bash 4.4): The : built-in (synonym of true) is used instead of a temporary variable by setting the last argument, which is stored in $_. 6 Ways to check logged in users in Linux - howtouselinux Is there a portable way to get the current username in Python? $ ulimit -u 10 If we try to exceed this limit, well encounter an error: Grant Sudo Access to Users Users system privileges are stored in the file /etc/sudoers. Usage: It works on both Windows and *nix (the latter uses the pwd module as described in the other answers). 6 Ways to check user information in Linux - 2DayGeek its complaining about 'USER' not being found in envirnment variables I guess. Are there causes of action for which an award can be made without proof of damage? It prints real and effective user and group IDs. who The who command prints information about all users who are currently logged in. There are 3 users in this system. how do I get my code to use the value of the $HOME variable? When I search for it, I only find results for the opposite (finding the LXSS user path from the host) A Beginner-Friendly Guide for Linux / Start Learning Linux Quickly How to Monitor Linux Commands Executed by Users in Linux, How to Monitor Linux Users Activity with psacct or acct Tools, whowatch Monitor Linux Users and Processes in Real Time, MimiPenguin Display (Hack) Login Passwords of Linux Users, 2. groups Command View User Group Memberships, 3. finger Command Show User Information, 4. getent Command Fetch User Info from System Database, 5. grep Command Search for Patterns or Specific Text in Files, 6. lslogins Command Display User Information in Linux, 7. users Command List Current Logged-In Users on Linux, 8. who Command Show Information Of Currently Logged-In Users, 9. w Command Show Currently Logged-In User Activity, 10. last Command Show Most Recent Login Session, 11. lastb Command Show Failed Login Attempts, 12. lastlog Command List User Login Information, How to Use fgrep Command to Search for Strings in Linux, egrep Search for Specific Strings in Multiple Files, How to Delete User Accounts with Home Directory in Linux, 3 Ways to Change Default User Shell in Linux, How to Block or Disable User Logins in Linux, Powerline Adds Statuslines and Prompts to Vim and Bash Shell, How to Install Eclipse IDE in Ubuntu, Debian and Linux Mint, A Beginners Guide To Learn Linux for Free [with Examples], Red Hat RHCSA/RHCE 8 Certification Study Guide [eBooks], Linux Foundation LFCS and LFCE Certification Study Guide [eBooks]. Other Linux desktop environments should show your username in a similarly easy-to-find menu. Return types sysname Remarks CURRENT_USER returns the name of the current security context. Your result is likely to be a lot less. Since we launched in 2006, our articles have been read billions of times. 2 Answers Sorted by: 40 See the FreeBSD handbook (information also valid for Linux): Group ID (GID) The Group ID (GID) is a number used to uniquely identify the primary group that the user belongs to. Does Pre-Print compromise anonymity for a later peer-review? The cofounder of Chef is cooking up a less painful DevOps (Ep. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. with, -1 for using unsafe methods, at the very least you should be using. user1 tty1 - 10:15 0.00s 0.01s 0.00s w Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. Can you legally have an (unloaded) black powder revolver in your carry-on luggage? What's the correct translation of Galatians 5:17. That figure includes the system accounts and users created by applications. What would happen if Venus and Earth collided? This tutorial shows how to get user ID (UID) in Linux. Therefore, this function should not be relied on for access control purposes (or possibly any other purpose, since it allows any user to impersonate any other).". Here's a small shell function that doesn't ignore the exit code of getent: If you are logged in as root, if you know USER's password, or if the USER has no password, the following is yet another option: Under standard su behavior, if USER is undefined or empty, then su will attempt to run the command as root. How can I know if a seat reservation on ICE would be useful? Then, you can read from it by creating a The bottom entry in the drop-down menu is the user name. Multiple boolean arguments - why is it bad? Lets see what the highest user account ID is. grep current user It provides a convenient way to retrieve the current users identity within a shell session. CURRENT To get the current user name, type: echo "$USER" Get the current user name and store to a shell variable called $u: u = "$USER" echo "User name $u" Sample This solution is clever, but makes some assumptions that aren't always true. If it is a remote session, it also tell us where they are logged in from. Well tell awk to use the colon : as the field separator, and to print the first field. This is just a hacky solution and will break if your current working directory is on another drive. How can negative potential energy cause mass decrease? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Subscribe to our mailing list and get interesting stuff and updates to your email inbox. id -u # user ID (UID) id -g # group ID (GID) Example run and output: $ id -u 1000 $ id -g 1000. and: $ But wheres the fun in that? It is not an answer to the question that was asked, it is an answer to a different question. Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge. The first line displays, in this order: The current time ( 22:11:17 ) How long the Linux server has been running (18 days) How many users are currently logged on Linux (2 users) Were going to use the -E (extended regex) option. We can achieve the same sort of thing using the cut command. There were many unknown login attempts on our server. To me using os module looks the best for portability: Works best on both Linux and Windows. Run id command without any username to print the current user information on your terminal. C user name in linux - get current user name - Stack Overflow To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Linux is a multi-user system. rev2023.6.27.43513. How common are historical instances of mercenary armies reversing and attacking their employing country? On the server with tcsh I used: last | grep "$user" and the current user could see how many times they logged on this month. Shouldn't it be USER instead of USERNAME? The reason for the long execution time is thatgetent tries to find matches for all of the user account values right up to 60000. If your Linux distribution doesn't, run "who" or "whoami" in the Terminal to get the username instead. Not the answer you're looking for? 1 To get the output of the process, you need to attach the InputStream of to the normal output of the subprocess. The best answers are voted up and rise to the top, Not the answer you're looking for? The awk portion isolates the desired data-- for variables or in general the computer that can't make on the fly assumptions just yet at this rudimentary level. You can use the id command to print user and group information for the specified user, or for the current user. 3. user3 is logged in on pts/1 and associated with display `:1`. The ID of the root account is 0. How to exactly find shift beween two functions? Check User Groups in Linux 3. finger Command Show User Information. Logout Time: The date and time when the user session ended (if the user has logged out). Nothing in the command line shown seems to be specific to any shell. 2. $ whoami From what I'm seeing here all answers are wrong, especially if you entered the sudo mode, with all returning 'root' instead of the logged in user. One of these techniques is sure to suit your needs when you need to review the user accounts on a Linux computer. lastlog command is used to find the details of the most recent login information for all users or a specific user on the system, which provides details about the last login time and location for each user. whoami returns the OS user and $USER returns the ssh user. Did UK hospital tell the police that a patient was not raped because the alleged attacker was transgender? The w command provides us with the user name which is what we wanted, and a bonus set of data for that user. It shows a users real name; home directory; shell; login: name, time; and so much more as shown below. Access The Current User Email and Name from the Bash in Mac OS X. Use apt-get to install this package onto your system if youre using Ubuntu or another Debian-based distribution. user2 pts/0 192.168.1.100 09:45 1:30 0.20s 0.05s sshd: user2@pts/0 p.s. These are held in the /etc/login.defs file. In order to get user information out of it, you run getent passwd $USER. The website contained numerous files and directories that needed to, 2 ways to change file permissions in Linux, This article is part of the following series. In this case, it refers to the /var/log/secure file, which is commonly used to store security-related logs on Linux systems, including authentication attempts, successful logins, and other security events. How can negative potential energy cause mass decrease? Alternative to 'stuff' in "with regard to administrative or financial _______. Multiple boolean arguments - why is it bad. There is nothing wrong with getpass.getuser(), since does not claim to authenticate the user. In large organizations, having insight into who has access to the system is crucial to Something similar to os.getuid() would be nice: The pwd module works for Unix only. After over 30 years in the IT industry, he is now a full-time technology journalist. That file is world readable (anyone could read it), so any user has access to its contents. commands.whoami did great, even in the context of a service running under a different username. user name). If you are a beginner for Linux operating systems and want to know more about the /etc/passwd file, please refer the following article. user2 pts/0 Wed Jun 23 17:45 still logged in (192.168.1.100) Using the awk command we can display just the username. Well pipe the output through sort and use the -g (general numeric sort) option. user3 pts/1 Wed Jun 23 15:20 Thu Jun 24 09:00 (192.168.1.101). His writing has been published by howtogeek.com, cloudsavvyit.com, itenterpriser.com, and opensource.com. USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT Etc. In python how can I get current users SID in Windows? We have added several tweaks in this tutorial to collect user information with different aspect. doesnt work for me in win10, python3.7.4. The usual place is /home/$USER, but that does not have to be universal. ", Exploiting the potential of RAM in a computer with a large amount of it, Write Query to get 'x' number of rows in SQL Server. running Python 3.7 running on a Pi4B with RaspberryOS Buster. Find centralized, trusted content and collaborate around the technologies you use most. Simple. The getent command reads information from system databases. Theoretically can the Ackermann function be optimized? skinny inner tube for 650b (38-584) tire? An alternative to whoami is id -u -n . id -u will return the user id (e.g. 0 for root ). Is a naval blockade considered a de-jure or a de-facto declaration of war? Many of your questions are quickly answered by either: to get the documentation for the system you are using or usually more conveniently: This may give different results for some things where Linux and Unix have modest differences. If you used su, then this won't return the current user, but the originally logged in user. It allows you to filter and extract lines from text based on matching patterns. Does Pre-Print compromise anonymity for a later peer-review? . What are these planes and what are they doing? The lastb command is used to display a list of the last failed login attempts on the system. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I see a function called getUser in the Espo core files, but I my code is running in a hook, so I need to somehow use dependency injection to get access to the current user object. Well use the -F (field separator) option. gets you the regular user (if non-sudo) or the regular user behind the current sudo call. WebSelect Apply & Restart. In order to get UID of a current user, run the id command with -u option: 1 id -u Output example: 1 1000 If your Linux distribution doesn't, run "who" or "whoami" in the Terminal to get the username instead. In Solaris OS I used this command: $ who am i # Remember to use it with space. Unless I'm mistaken this would be the way to go if portability is a concern as the. Similar quotes to "Eat the fish, spit the bones". Prakash Subramanian is a Linux lover and has 3.5+ years of experience in linux server administration with major Linux distribution such as (RHEL, CentOS, Ubuntu). Dave McKay first used computers when punched paper tape was in vogue, and he has been programming ever since. It displays information about current users on the machine by reading the file /var/run/utmp, and their processes from /proc. Jan 26 12:08:06 ip-172-31-37-167 sudo[31036]: pam_systemd(sudo:session): Cannot create session: Already running in a session or user slice I don't know how they behave when running as a service. If you're stuck on python 2 on Windows, this is the only safe way to do it. Now that we know who this user is, we can obtain more information about them. does work on windowsPython 3.4.1 (v3.4.1:c0e311e010fc, May 18 2014, 10:38:22) [MSC v.1600 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. To get the current "logged in" user is just as simple, but it requires accessing different variables: $SUDO_UID and $SUDO_USER. My current use-case: tagging some shared testing resources with a username for easy cleanup later. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. What do you want to get when running under sudo? Is there a portable way to get the current username in Python? get Connect and share knowledge within a single location that is structured and easy to search. Modded you up. Those 2 commands display 2 different informations. User Accounts. @HagenvonEitzen Colons are forbidden precisely because they have been used to separate fields. analemma for a specified lat/long at a specific time of day? USERNAME is for Windows, USER is for Linux. Or just do something as simple as send it a SIGSTOP to make it take forever, effectively DOS attacking your script. Can Power Companies Remotely Adjust Your Smart Thermostat? Remote Host: The IP address or hostname of the remote machine from which the user connected (if applicable). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. getent will not work as expected for usernames consisting of all numerics.