Anything related with user accounts and user management on Unix-like systems.

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5
votes
2answers
3k views

Running a bash script as a less privileged user with upstart

This is the script, /home/jack/myscript.sh, which I want to run: export JAVA_HOME=/usr/lib/jvm/java-6-sun-1.6.0.26/ /home/jack/myapp/apache-tomcat-6.0.32/bin/./catalina.sh run The upstart file, ...
1
vote
1answer
214 views

For an init.d startup script, what is the ideal user to use as the owner of that process

Everyone says that running processes as root is bad, since it defeats the security and privileges model. But what user should be used to run a startup process? Is it really necessary to create a new ...
4
votes
1answer
310 views

Force pubkey-auth user to set password at first login

When I create a new user account I ask users to send me a public key, and want to force users to set the password the first time they log in with keypair authentication. If I create an account with an ...
1
vote
3answers
177 views

User's name appears as “bash-3.0” on SSH shell

I am working on a Redhat server and one of the users' names appears as "bash-3.0" on the "SSH Secure Shell Client." His name is appearing correct under /etc/passwd. How could this happen? How can I ...
7
votes
3answers
654 views

Does character 'ä' in usernames cause bugs in linux systems?

I want to use my first name as an username but it contains character 'ä'. I found this thread. Now I understand, why some some characters are disabled, but what about 'ä'? Can this character cause ...
3
votes
1answer
2k views

SSH not landing in the home directory

I have recently installed Raspbian into a Raspberry Pi. As part of the installation process I changed the user name and group from the default (pi) to my own (let's call it user) using usermod and ...
2
votes
1answer
184 views

Home folder name with Unicode characters? [duplicate]

Possible Duplicate: Does character 'ä' in usernames cause bugs in linux systems? Is it possible to create a user with a Unicode login name (and home folder name) ? For ...
1
vote
2answers
142 views

Login to super user for running script

I have sample.sh script in /u01/dump location. I'm running it from root. My requirement is while running the sample.sh script it has to be login as oracle1 user using SU (super user) and display all ...
0
votes
2answers
688 views

How to suppress su authentication failure warning?

I created an account "diag" and set it as expired (usermod --expiredate 1). Then I have a script which I want to run to log into it, so in the script I use the following command: su -s /bin/bash - ...
6
votes
1answer
437 views

/etc/passwd sql with bash access

I just got a CentOS VPS and was reviewing the passwd file and saw this: mysql:x:498:499:MySQL server:/var/lib/mysql:/bin/bash Is bash necessary for mysql?
3
votes
1answer
235 views

Can linux use a mix of SHA-1 and CRYPT passwords?

We have an automated sync-routine that uses useradd to create new users on a Ubuntu 10.04 machine. The application launching the routine provided both username and CRYPT-encrypted password. However, ...
3
votes
3answers
9k views

How to create an unprivileged user in CentOS?

I want to create an unprivileged user to run my RhodeCode server and Celery daemon on a CentOS instance. I think the accepted definition of this is no home directory, login disabled, and no shell ...
4
votes
2answers
2k views

/etc/shadow and /etc/passwd format compatibility

Are formats of files /etc/shadow and /etc/passwd same on all unix and unix-like systems same or are there significant differences? I mean syntax of files, not file location or name
1
vote
1answer
216 views

Copying a directory to multiple users home dir and changing user/group ownership

On my Ubuntu server there are about 150 shell accounts. All usernames begin with the prefix u12.. I have root access and I am trying to copy a directory named "somefiles" to all the home directories. ...
6
votes
1answer
4k views

Group within group file permissions

I tried finding this on here, but couldn't so sorry if it's a duplicate. Say I have 2 groups and a user: group1, group2, user1 with the following structure: group1 is a member of group 2, user1 is a ...
1
vote
2answers
398 views

Can't SSH/FTP into new user account in Ubuntu?

Created new user from shell script using following command: sudo useradd $1 -p $2 --home /var/www/$1 I'm not able to login to FTP or SSH as that user, do i need to add the user to some group for ...
13
votes
2answers
5k views

How can I determine if someone's SSH key contains an empty passphrase?

Some of my Linux & FreeBSD systems have dozens of users. Staff will use these "ssh gateway" nodes to SSH into other internal servers. We're concerned that some of these people use an unencrypted ...
3
votes
2answers
678 views

Start Vim as my user with root privileges

I have my custom Vim files in ~/.vim and settings in ~/.vimrc. However, sometimes I have to edit some files in /etc and such. If I start Vim like this: $ sudo vim /etc/rc.conf I lose my config ...
2
votes
4answers
2k views

Allow paswordless user to change to another passwordless user

I have two users dev and tomcat neither of them have a password. How can I allow dev 1 do su - tomcat without having him having to enter any credentials? 1 connects with ssh keyfile
3
votes
2answers
2k views

'mysql' user and group creation, ownership settings

I know what the linux command chown does, I used it to change the ownership or group of a file. If there is a MySQL installation on a Ubuntu machine, I saw some people doing the following thing: ...
12
votes
3answers
1k views

Can I limit a user (and their apps) to one network interface?

As the title really. I've actually got two scenarios to apply this: Multiseat Desktop: two network connections both with internet gateways and two accounts doing bandwidth-intensive tasks on each. I ...
5
votes
2answers
3k views

How do I add a guest account to Linux Mint 13?

Is there a way to add a guest login account on welcome screen of Linux Mint 13 MATE-32bits, similar to the one present in Ubuntu 12.04?
2
votes
1answer
2k views

file system uid and gid in linux

I came across a linux kernel tutorial and there they talked about 4 pairs of identifiers and one of them was file system uid and gid. Could someone explain me what it is and how it is different from ...
1
vote
1answer
507 views

Correct owner, group and permissions when mounting an image file

Suppose I have an image home.img of a home partition of another linux machine (B). On that machine there is a users userB and there is a special group, groupB. Consider for example a file fileB in the ...
2
votes
1answer
252 views

What user installs a .deb package?

I am experiencing a behavior in the installation of a .deb package that I don't really understand. I have a set of "things" in my computer that I deploy to remote computers using a .deb package. I ...
2
votes
2answers
121 views

How to generate folder ownership lists for each user?

I'd like to generate several separate lists for each user in Ubuntu. The lists contains the files and folders belong to each user. Using the command following list me all the users in the system: ...
3
votes
0answers
184 views

Will a account get locked while logging in FTP mode to a remote server whose password has already expired in UNIX

I have a FTP user id to a remote server, the password for which has expired.The account is getting locked if connection is being made in FTP mode to the server with the old(expired) password. Is ...
9
votes
2answers
1k views

Why is /etc/passwd open to public for reading?

Is there any reason that /etc/passwd should be world-wide readable ? It's not like password hashes that shouldn't be exposed, I just want to know why.
4
votes
1answer
136 views

In crontab is it possible to specify a user from a variable?

I am trying to have the following cron executed with a certain user. U=`/usr/bin/w | grep -w :0 | awk '{ print $1 }'` */1 * * * * $U /opt/script.sh It seems the deamon doesn't know how to interpret ...
4
votes
2answers
864 views

How can I make all my processes start with niceness 5

I know that niceness values are inherited from the niceness value of the parent process, but can I globally change the default niceness value for a particular user (myself). In this case I have a ...
5
votes
1answer
394 views

Is it safe to use /bin/cat as shell for a restricted user?

I need to remontely log on to few peoples machines to do maintanance tasks, but sometimes the machines can be behind firewalls or NAT's. The way I have been doing it is to give the user advice on how ...
10
votes
1answer
6k views

Meaning of root:wheel

What does root:wheel mean in the following? chown root:wheel myfile
12
votes
3answers
4k views

Creating a user who cannot get an interactive shell

What are interactive and non-interactive shell? Questions: Create a user john who should not get an interactive shell. How can we do this?
4
votes
1answer
6k views

How to create a user with given password on SuSE from command line?

I need to create bunch of new users with given password. What I want is a script that I would pass the user name of new user and it will create/add the user and set its password. (the password is the ...
9
votes
2answers
3k views

How do I leave a message for another (local) user?

I know you can use write to send a message to a currently logged in user, but how do you leave a message for a user who is not logged in? The solution I have seen is modify the motd, but that will be ...
2
votes
5answers
7k views

What is the command for listing all users who are members of the admin group?

I am looking for the name of the superusers list on Fedora. (On Ubuntu is seems to be "sudo".) I want to add one of the users to the superusers list. The groups command only lists the groups of the ...
0
votes
1answer
183 views

what does 'old' mean in the output of `who -u`?

Title says it all. In the listings of who -u, some of the records show the string "old" in the idle time column. I know that "." means the session is not idle. What's the meaning of "old"? The ...
7
votes
3answers
631 views

Prevent a unix account from being able to SSH [duplicate]

Possible Duplicate: Disable direct login for normal users (like oracle) in linux but allow scp and sftp? I want to prevent a unix account from being able to be SSH'ed with, but it should ...
0
votes
1answer
218 views

Incompatible group permissions in Linux - Is it a bug? [duplicate]

Possible Duplicate: How to apply changes of newly added user groups without needing to reboot? I am on Ubuntu 11.04. I am creating another user and placing an existing user in the group of ...
10
votes
6answers
4k views

What does the “number” in the owner field of files signify in linux?

I copied many files to my new linux host. I see that all files have the owner and group both set to 515. What does that mean?
1
vote
1answer
1k views

How to create an user only with SSH -access and easily-set-up .ssh -dir perms?

I often mess up when I manually set up the .ssh -dir, easy to forget some flag. I often need to create a new user and only allowing access with SSH, how can I do that? Basically, I want to stop doing ...
1
vote
1answer
343 views

Broken PATH in CentOS 5.x

I am having troubles with typing commands within the terminal on some of our CentOS servers. For example, I have to include the complete and full path to the command (i.e. /sbin/chkconfig vs. ...
5
votes
1answer
603 views

Is it possible to find times of past user sessions?

Using the who command, I can find which users are currently logged into a machine. I would like to determine which users have logged into my machine in the past, and the length of those sessions. Is ...
1
vote
1answer
593 views

Creating a proFTPd user

I'm setting up a proFTPd server so I can upload files to my webserver, but I've never tried this before. I've installed proftpd, added a user with a home folder: /home/FTP-shared and added /bin/false ...
5
votes
1answer
5k views

Running chsh does not change shell

I want to change my shell from bash to zsh. I have tried running the following while logged in as user zol: $ chsh -s /bin/zsh $ sudo chsh -s /bin/zsh zol $ su -c 'chsh -s /bin/zsh zol' # The above ...
2
votes
2answers
956 views

SFTP with Mysql user pass instead of PAM

Is there a way for people to log onto a debian server via sftp using just mysql database table as authentaction. IE not adding a user to the system? I know it can be done over ftp and TLS but i ...
6
votes
1answer
428 views

How to disable Switch User option from Fedora 15

Is there a way to disable the Switch User option from a locked screen on Fedora 15? I've tried this way, but no luck, since gconf-editor has no effect.
1
vote
0answers
290 views

Adding a second user to a system group? [closed]

I am trying to get around a permission issue I am having. The only reasonable option (other than ACL) is to add the user that needs access to the system group of the user that has access. Yes, the ...
6
votes
2answers
909 views

UID of a deleted account

How can an administrator find the UID of a user that's been deleted with the userdel command?
6
votes
3answers
16k views

How can I look up a username by id in linux?

The command id can be used to look up a user's uid, for example: $ id -u ubuntu 1000 Is there a command to lookup up a username from a uid? I realize this can be done by looking at the /etc/passwd ...