Who is in unix group

You must be the owner of the file, and you must be a member of the new group in order to make the change. In many cases the group ownership does not matter, but if you want to share a file with a group, then it is important that you get the ownership correct.

Otherwise you may be inviting all users to put their large files in your directory. Just setting up a file to be owned by a group does not give your group any access to the file. Granting and limiting access is done by setting appropriate permission bits.

You can see the permission bits as a set of 10 letters or dashes in the long listing of a file or directory using the 'ls -dl' command. The -dl option on the ls command will list the information for the directory or file in long format. Without the "d" all the files in the directory would be listed instead of just the directory you asked for. For example to get a long listing for a directory with the name test.

The first string of characters are the mode, the next is a link count see 'info ls' for details , the third field is the owner and the fourth field is the group which owns the file. Begins with a "d", which indicates this is a directory. The owner, cmmiller, has permission bits rwx which is full access.

Any other user in group csstaff has permission bits r-x which is browsing access can read and search without permission to add, rename or delete files in the directory.

Every other user, that is not cmmiller and not in group csstaff has permission bits which is no access. The user with login name cmmiller is the owner of the file. The owner will have permission modes according the the first three codes after the "d".

The owner always can change permission modes with the chmod command. The directory is said to be owned by this group. Any user in group csstaff, except cmmiller, will have permissions granted according to the middle three codes in the permission modes. Once you check to make sure a directory and all its files and sub-directories are owned by the correct group you can set the permission modes for everything with the one command.

The chmod command can also be used to allow members of a group to put files in a directory. The owner of the directory can open a directory for shared writing with the command:.

The "s" is the group set-ID setting, which means all new files in this group will be owned by the user putting them there, but the group ownership will be set to match the group of the directory rather than the current group of the owner.

This is the recommended way to keep group ownerships correct. This is document aeqw in the Knowledge Base. Last modified on Skip to: content search login. Knowledge Base Toggle local menu Menus About the team. Another suggested answer proposed using getent , which also is likely to be on a Linux machine with Debian, it is part of GNU libc.

I like most do not have libusers or lid installed, so I cannot comment on whether it satisfies OP's conditions. There is also the id program, which gives group information. Someone might expand on that as a possible answer. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Learn more. How can I find out which users are in a group within Linux? Ask Question. Asked 6 years ago. Active 8 months ago. Viewed k times. Improve this question. Dubu 3, 16 16 silver badges 26 26 bronze badges. Jess Louise Jess Louise 1, 2 2 gold badges 9 9 silver badges 6 6 bronze badges. That is the groups command. It is unlikely that you do not have it on Linux, since it is part of coreutils.

Add a comment. Active Oldest Votes. I prefer to use the getent command For each account, the corresponding user's name is stored, along with their password and other data for internal use, in addition to certain personal information about the user. In distributed systems the NIS system can be used so that multiple networked computers have access to the same user database. As already indicated, along with the internal use information of the system, personal information about the user is also stored.

This data can be consulted by any other user of the system by means of the finger command. No Plan. It indicates its directory and its shell by default. If it is connected, it is indicated from when, and if not when it was the last time it was connected. If the researched user takes more than a minute without typing anything in the terminal it is supposed to be inactive in English idle and it shows how long it has been like this.

Then you can check if the user has an email or not and when was the last time you read it. Remember that UNIX was developed in academic and research environments.

In those days the project file stored information about the project on which the user was working. Currently the. In general, people often use them to make public all kinds of information.

Many users place quotes, jokes or drawings, but rarely a true plan or project. Information accessible by finger can be modified using the chfn change finger information command. Just type in the order followed by enter:. In addition to the name you can enter other information, such as the room number and work and home telephones. In some systems, the chfn command is disabled, thus preventing public information from being modified.

Thanks to this through finger you can know the true identity of the user, and there is no possibility of it modifying it to pass itself off as another. Delgado, Hugo. Users and groups in UNIX.