Permissions are the unix way of controlling access to resources such as files, directories and devices and may be specified for an owner, group, or all users.

learn more… | top users | synonyms (1)

2
votes
1answer
1k views

How to edit /var/www files using phpstorm?

I want to edit the /var/www files using any editor like phpstorm or eclipse etc, without changing the default user/groups setting for /var/www. Since phpstorm is invoke by a script , I dont know how ...
2
votes
1answer
21 views
+50

Give specific user permission to kill other users with logind?

Is it possible to give one user (the "main user") the permission to kill other users using logind/loginctl?
0
votes
0answers
23 views

Jboss startup ownership issue

Facing few issues with jboss startup . After jboss startup , permission of few files got changed because of which we had to manually change the files and start jboss . $ ls -l /etc/init.d/online ...
0
votes
0answers
16 views

Is there a way to change file/folder ownership on a server in Ubuntu/Kali-Linux? [migrated]

I accidentally changed file ownership of a folder in Windows 7 and now nobody can edit, copy, view, move it, etc. Not even the administrator account account can change it back. I tried icacls and ...
1
vote
1answer
2k views

Allow all group members to create directories and files

There are 2 users sftp_user apache Both users belong to the updaters group as well as other groups. New directories and files are created in the /updates/ directory. drwxrwsr-x 8 sftp updaters ...
82
votes
2answers
14k views

Why do we use su - and not just su?

I don't understand why su - is preferred over su to login as root.
3
votes
3answers
115 views

Symbolic link creation failing: change ownership issue

I am facing some issue with creating soft links. Following is the original file. $ ls -l /etc/init.d/jboss -rwxr-xr-x 1 askar admin 4972 Mar 11 2014 /etc/init.d/jboss Link creation is failing with ...
-1
votes
2answers
25 views

How to make an existing directory (and sub-directories) to be suddenly writable by ROOT ONLY?

Let's say i have a directory, at: /tmp/uploads/ And inside got several recursive directories and files created by DIFFERENT USERS before. So now, suddenly how do i make that above directory to be ...
-2
votes
1answer
38 views

How to make a NON-WRITABLE directory?

Actually i'm aware of a "PHP Web Folder". There seems to be some potentials of incoming attacks. So that i want to make sure this whole directory is READ-ONLY (Only writable by ROOT). Let's say the ...
0
votes
1answer
23 views

Could not chdir to home directory when create and login a new user?

I'm a new user of CentOS and now I want to create a new user of my system and let it can only access one directory. First I create a group named test. Then: useradd -g test -d ...
2
votes
1answer
23 views

Using ACL Permissions without allowing other groups to access a directory?

0. Add user bkupusr to group extbk leeand00@hostname:/home/leeand00/$ sudo groupadd extbk leeand00@hostname:/home/leeand00/$ sudo usermod -G extbk bkupusr 1. Created directory structure: ...
2
votes
3answers
161 views

`tail -n 40 /var/log/apache2/error.log` without `sudo`

Many times during the day I need to inspect my Apache log: sudo tail -n 40 /var/log/apache2/error.log I then have to provide my password. It's a clumsy workflow, so instead I am adding ...
6
votes
7answers
299 views

File protection in Unix

Is there a way to protect a file in such a way that even root cannot delete it or rewrite it after creating it? I have a file which is created by root under /var/log/ and I want to restrict all users ...
1
vote
2answers
33 views

Wrong eUID in `/proc/PID/status` when SETUID is used

While doing a wargame challenge, I ran into an issue with permissions. The info given by /proc/PID/status is not in adequation with the permissions that should be given to the processus. I am user ...
8
votes
5answers
15k views

How to get back sudo on Ubuntu?

I have done this: sudo chown -R myname /usr/ and now I can't use the sudo command because of this error: sudo: must be setuid root And as I read this means that the owner of this file ...
2
votes
2answers
623 views

How to give Windows partions' file execute permission

I have installed Linux Mint 17 and Windows 8, as dual boot. 500GB hard disk has 5 partitions. Two of them are NTFS and the other 3 are ext4 partitions. When I log into Windows, I can not see any ...
2
votes
0answers
29 views

Sed is unable to copy temporary file to original file [duplicate]

My aim is to edit the file(Whose owner is user1) using script where user2 don't have permission to directly edit the file but it should be edited when executed through script by user2, so I set SUID ...
0
votes
0answers
9 views

Managing users and groups

I am using ubuntu inside a virtualbox and has very little knowledge about unix. I am following this tutorial. And in it there's a portion to add a user to the group. $ sudo groupadd --system webapps ...
0
votes
2answers
1k views

Linux Permissions vsftpd

I have mybb installed and running in /var/www/forums. I have two users part of the www group, logan and www-data. I have the recursive permissions of forums directory set to: chmod -R 755 forums ...
5
votes
2answers
204 views

Running setuid binary temporarily without setuid?

Currently setting up xpra, which wants to run an X instance as non-root using the dummy driver, but the system Xorg binary is SUID. Since the system auto-updates, I would prefer not making and ...
7
votes
8answers
9k views

Convert ls -l output format to chmod format

Say I have the following output from ls -l: drwxr-xr-x 2 root root 4096 Apr 7 17:21 foo How can I automatically convert this to the format used by chmod? For example: $ echo drwxr-xr-x | ...
1
vote
1answer
43 views

Permisission with mplayer

I am trying to use mplayer to directly play video into the framebuffer. Currently I cannot get the audio and video to play on the same run level. The audio devices will only connect if I am in user ...
1
vote
3answers
40 views

permissions of script to change permissions?

I have a VMWare VM that directly accesses some disks. In order to run (without running vmware as su which has its own problems) I need to change the ownership of the devices. I've done this manually ...
0
votes
1answer
22 views

Desktop effects/graphics settings probably get reset after each reboot

I am using PC Linux OS, full monty(KDE) and probably after an update, I have started experiencing the following behavior: After each reboot, the Kresource migrate tool starts up, even though Akonadi ...
1
vote
0answers
8 views

defining firewalld permissions without SELinux in Debian

I don't find an explanation regarding the permission system of firewalld in Debian without SELinux. I have multiple users. How do I grant one user admin permissions to firewalld while denying these to ...
1
vote
2answers
56 views

What is the file permission of /etc/shadow in CentOS?

What is the default file permission of /etc/shadow in CentOS? Is there any difference in the default file permission of /etc/shadow in previous versions of CentOS?
14
votes
3answers
1k views

Purpose of permissions such as 0111 or 0333

What is the purpose of Linux permissions such as 111 or 333 (i.e. the user can execute, but cannot read the file), if the ability to execute does not automatically imply the ability to read?
3
votes
1answer
50 views

Not able to cd into world-readable directory on NFS

There is a directory created by root, and I am not root user. But I am not able to do a cd into that directory in spite of having execute permission for others. Why so? Has the write permission on ...
1
vote
0answers
30 views

logadm permission issue in Solaris

Facing the following issue in a solaris box while using logadm tool . It is showing me permission denied error . -> logadm -w princelog /html/web/www.log -C 3 -s 500m -z 0 logadm: Error: ...
5
votes
2answers
57 views

`sudo cp -a` changes ownership to root (instead of preserving the original user)

I was trying to backup some directories and some of the copies made by sudo cp -av resulted in being owned by root while others preserved their attributes. Is this a known issue or am I missing ...
3
votes
2answers
2k views

NFS partition mounted as read only

(Disclaimer: I've read "NFS sharing is read only" and I think it's not the same problem) I have just setup NFS on my raspberry (Raspbian) and I'm trying to access it from OSX. So far so good, I can ...
1
vote
1answer
15 views

Unable to execute program without root privileges regardless of group or permissions

avrdude is a simple tool that allows downloading of a program to a target microcontroller. For completeness, the command I am trying to issue is: avrdude -p atmega328p -c usbtiny -P usb -v -U ...
50
votes
3answers
63k views

Make all new files in a directory accessible to a group

Suppose I have two users A and B and a group G and a folder foo, both users are members of G (using linux and ext3). If I save as user A a file under foo, the permissions are: -rw-r--r-- A A. ...
0
votes
1answer
33 views

python && unix permissions (gitlab) [closed]

I have directory /home/git/repositories with rights 770 and uid=git,gid=git user1@gitserver:~$ ls -la /home/git/ | grep repo drwxrws--- 42 git git 4096 Jun 30 17:02 repositories I have user ...
1
vote
3answers
29 views

To Rsync files where permission denied

I want to find those files which I cannot copy to another location such that I could do Rsync. I have an external HDD and my system´s HDD. The external HDD has files which my system is missing. I ...
3
votes
1answer
27 views

give group permissions to specific device

I have a panning web camera I built, (future robot arm). The camera pans via a web interface (cgi scripts and JS interface) which access an arduino. To enable sending of commands via the interface, I ...
1
vote
1answer
29 views

What are the default file permissions in CentOS?

What are the default file permissions in CentOS 5, CentOS 6 and CentOS 7? Is there any difference in the default file permissions between these OSs?
1
vote
0answers
57 views

User has write permissions but cannot write to files

I am using a python script to write (and sometimes overwrite) data files. I can write new files just fine, but am getting permission denied when trying to write to existing files. What's strange is ...
1
vote
1answer
35 views

Which group should own /var/www/html?

I have a CentOS 7 VM setup on my Windows 7 host. I have installed vsftpd and ftp and can now successfully connect from the host with FileZilla, but the user I log in as doesn't have permissions to ...
1
vote
2answers
54 views

How to Change Owner of a Directory

EDIT: The problem was that Apple uses permissions to mark backups and prevents you from modifying them (probably a security feature). By using chmod -RN <dir> I removed ACL data from all the ...
2
votes
1answer
1k views

ntp cannot open shared object file: Permission denied

On a server I haven't worked on, ntpd is broken: # /etc/init.d/ntpd start ntpd: error while loading shared libraries: libz.so.1: cannot open shared object file: Permission denied but permissions ...
2
votes
1answer
66 views

Getting 'Forbidden error' browsing a page in localhost with permission to read, write and execute

I guess there's something I'm missing here but I need to solve this in order to feel confident while learning how unix/linux OS work. I've seen some similar questions on this topic but I don't think ...
0
votes
2answers
20 views

Peristent LiveCD: Allow user to write-access to usb key

Using kubuntu liveCD in persistent mode, I'd like to allow user to write on boot usb key (to put data out of "casper" file). USB (root) is auto mounted in /cdrom kubuntu is "main" user (uid 999) ...
0
votes
0answers
14 views

Giving S_IWUGO permission to module parameter results in compilation error (while S_IRUGO or S_IXUGO doesn't) - why? [migrated]

I wrote a simple kernel module to learn module_param feature of the kernel module. However, if I give the S_IWUGO, S_IRWXUGO or S_IALLUGO permissions for the perm field, I get the follwing ...
1
vote
2answers
33 views

Stat substitution command to capture numeric file permission in Solaris 10

There is no stat command in Solaris 10. Is there any way to get numeric file permission?
1
vote
1answer
39 views

Starting Apache Httpd at Boot time with Zero intervention, CentOS and authbind

I want to start Apache Httpd when Linux starts (with Zero intervention like submitting the root password, I don't want write the root password to start the apache service!!!) Later of Apache was ...
2
votes
1answer
14 views

Allow certain guests to execute certain commands

I would like to create a new user on some of my Debian/Ubuntu hosts that is able to update the server using the commands apt-get update and apt-get dist-upgrade, but I do not wan't to give them full ...
1
vote
0answers
19 views

Why can't I view a folder in the Files navigator, but permissions are 766, owned by me?

I have the following mounted drive: caleb@ubuntu-box:/media/data/plex$ ll total 20 drwxrwxrw- 5 caleb caleb 4096 Jul 11 13:29 ./ drwx------ 3 caleb caleb 4096 Jul 10 19:48 ../ drwxrwxrw- 4 caleb ...
0
votes
2answers
49 views

Cannot change ownership of folder owned by nobody

After a forced reboot a particular folder in my home directory is owned by nobody. I am trying to change that to root but I get the following chown: cannot read directory ‘databases/’: Permission ...
3
votes
1answer
32 views

Why am I able to write a module parameter with READ ONLY permissions?

I wrote the following simple linux kernel module to test the param feature: #include<linux/module.h> int a = 5; module_param(a, int, S_IRUGO); int f1(void){ printk(KERN_ALERT "hello ...