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.

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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 ...
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2answers
948 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?
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152 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 ...
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99 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: ...
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1answer
38 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 ...
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197 views

Storing text files inside root directory

I am currently in the /bin directory. I am trying to create a text file of the content of the /bin directory and direct it to be stored in another file within the /root directory. I have entered the ...
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1answer
115 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 ...
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1answer
69 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 ...
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3answers
143 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 ...
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1answer
54 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?
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103 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 ...
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1answer
341 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 ...
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1answer
123 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 ...
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623 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 ...
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2answers
66 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?
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1answer
226 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 ...
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1answer
260 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 ...
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76 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) ...
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31 views

Why can't I view a folder in the Files navigator, when 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 ...
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2answers
674 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 ...
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0answers
21 views

New files in a mounted directory are being created with a different user and removing write permission for other users

I am running a python script that outputs files into a mounted directory on a different computer. The script can be run multiple times in a way that overwrites the contents of created files. However, ...
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1answer
106 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 ...
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35 views

Linux RPM installation - Who defines the rights?

I am new to Linux, and I am using rpm -i to install an RPM package successfully. However, I do realize that I have to use the root account to install the package every time. I have several users in ...
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39 views

File permissions for kernel have changed in OSX Yosmite, why?

I am working my way through the book Learning Unix for OSX Mountain Lion (I don't have access to the updated version for OSX), in which it demonstrates that using $ ls -l /mach_kernel should ...
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1answer
118 views

Why can't I write to my ext4 partition even with 777 permessions?

When I touch a new file for example I get: touch: cannot touch 'file': permission denied It is a partition that is mounted in the /media directory on demand. I am the owner and I've had it's ...
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3answers
2k 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?
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What is so special about Linux permission 004?

I was reading Practical Unix and Internet Security, when I came across the following lines which I couldn't comprehend. If you are using the wu archive server, you can configure it in such a way ...
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Configuring Samba to serve Unix-style files (e.g. owners, permissions)

I just learned that Apple has deprecated its own AFP network filesystem in favor of SMB2. I have looked, but can't find any solid information on how its handling of SMB2 implements Unix-style file ...
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1answer
45 views

Owners and groups of everything inside /var are changed mistakenly [duplicate]

I have recursively changed owner and group of /var to root:root. I have mistakenly ran following command while standing in /var. I thought I was in /var/www, sudo chown root:root . R Now many ...
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57 views

normal user runnig a bash script containing root command without password

I have a bash script that contains few commands that can only be run by root, e.g. wpa_supplicant. I would like to allow the normal user to run the script without sudo. I found these posts but they ...
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1answer
69 views

How does file system permission behave on different systems sharing an NFS export?

I'm familiar with how Linux permissions work on a single machine, but what happens when a directory is shared (specifically via NFS)? Also, what happens when two users are seemingly the same (same ...
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1answer
117 views

Using find -perm to find setuid files

I want to find list of all suid binaries. I use the command find / -perm 4000 However this does not give me any output. I understand that the SUID file may be in 4xxx permission mode. But if I ...
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1answer
130 views

accidentally moved and fixed /bin/ directory, but now can't su

I accidentally moved my /bin directory to /usr/bin/bin, anyway, I managed to move it back to its place with # /usr/bin/bin/mkdir /bin # /usr/bin/bin/mv /usr/bin/bin / and then I was able to login ...
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1answer
417 views

Meaning of chmod 1775

Created a folder "Sample_dir" and analysed its permissions. $ mkdir Sample_dir $ ll Sample_dir/ total 36 drwxrwxr-x 2 user user 4096 Jul 1 19:26 ./ drwx------ 71 user user 28672 Jul 1 19:26 ../ ...
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1answer
24 views

Create permissions for group to write and files created by owner are only writeable by owner

I have created a folder, /hello: it has the following permissions: Owner = rwx Group = rwx Others = r and the folder is owned by john and belongs to the group sales. I have created another user ...
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2answers
73 views

What can I do to start a terminal in a X server at boot without giving away root priveleges?

The problem: I run Linux on an arcade machine with a monitor that accepts a 15kHz signal. I can't see anything until the X server starts and a modeline gets the GPU to output the correct signal. My ...
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33 views

TUI Tool to change directory permission rules?

There are some strangers to Linux who need to use it in terminal mode but they are helplessly limited to accept that using chmod and chown is dead simple. They would be satisfied only by a tool that ...
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2answers
47 views

How can I give the user sufficient permission to access '/' directory?

How can I get the following to work? user@host:~$ cd .. user@host:/home$ cd .. user@host:/$ echo " " > txt.txt bash: txt.txt: Permission denied user@host:/$
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2answers
19 views

Can't get server access permissions working

I am trying to get a script going that will move files in the apache webserver directory for me without sudo. In my mucking around I somehow got edit and move permissions working for user nhergert, ...
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28 views

APCUPSD script can't close program

I want to use APCUPSD to stop a program (called ns_image_server) which runs in a terminal window when it detects that power has been lost, to give that program time to close before the computer shuts ...
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1answer
74 views

Why does file-roller appear to have lower privileges than the user?

In Ubuntu I have a mounted Samba share. I have selected some files in a directory on the Samba share in Nautilus and attempted to compress them to an archive in the same location. File Roller tells me ...
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1answer
35 views

Directory Permission Order [duplicate]

In Linux, let us assume we have a directory with the following properties: drwx---r-x 29 user1 group1 4096 Jun 22 14:11 dir1 can I, as user2 having group group1, navigate into dir1? Since ...
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2answers
125 views

ACLs and classic permissions

I'm trying to set up a git server on my FreeNAS server. The problem I have is with setting up the permissions for different users/groups just as I want. Basically I have two different groups: ...
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63 views

Formatting drives in linux always makes them read only [closed]

I'm using Debian 8 and trying to create an ntfs partition (on /dev/sdd). Whenever I format a drive either through the nautilus interface of right click > format... or even through command line ...
0
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1answer
280 views

Giving write permissions to www-data for a file within user's home with limited shell access?

I have an access to a remote server with ssh, but the access is limited: my account there, say UseR, can create files in /tmp and in its home directory, but not elsewhere; it can call chmod without ...
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76 views

Is it possible to change file permissions when copying

I have a directory with default ACL permissions that get copied to all files created in that directory, but only if they are created in that directory. Would it be possible to change the permissions ...
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1answer
140 views

Why and when does `lsblk` require `sudo`?

On my up-to-date Arch Linux, lsblk works fine without sudo: $ lsblk -o NAME,FSTYPE NAME FSTYPE sda ├─sda1 ext4 ├─sda2 ext4 ├─sda3 swap ├─sda4 └─sda5 ext4 sr0 $ lsblk --version lsblk ...
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1answer
32 views

Can non-sudoer modify anything outside of home directory

If a user does not have sudo privileges, can he/she create a file or modify any file outside of his/her home directory, and outside of any external media devices he/she might have connected to the ...
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84 views

untar error - Cannot change mode to rwxr-sr-x

I am trying to untar a .gz file , which is stored in the /root folder onto a directory in /mnt/flash2/example I use the following command - tar xzf filename.gz --no-same-owner -C /mnt/flash2/example ...
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1answer
41 views

User to run weechat over ssh

I want to create an account on my own server for a friend who wants to use weechat. I have created an account adduser friend and created an ssh pair for his login such that password login is ...