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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Changing user and group ID system wide (including file system attributes)?

(this question possibly related to Linux: simulating/masking user ownership upon mount of 'external' partitions? - Stack Overflow) I typically use Ubuntu (currently 11.04) as my desktop OS; let's say ...
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1answer
261 views

Adding a user to a group by default

I have a group that all users on the system share. The group name is common and it is to allow for a universal fileshare for everyone on the machine. How would I make it so that all new users are ...
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1answer
342 views

In a Virtualbox VM how do I set the filesystem permissions?

I have a virtualbox VM with arch Linux running on my windows PC (which I unfortunately have to use for work). I use this to work on my windows PC with a Linux environment as an alternative to Cygwin. ...
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1answer
3k views

Accessing another user's files

I have a file "abc" with permissions 440 .The owner of this file is "root" and the group of this file is "groupabc" . I have a user "user1" .Is their anyway I can see the contents of files "abc" using ...
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How does one permissibly access files on non-booted system's user's home folder?

I have a dual boot system with Mint 17.1 and Centos 6.6 I want to access a file in my CentOS user's home directory from Mint. (I cannot boot CentOS right now.) What is a clean/standard method for ...
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.sh file cannot be executed without explicitly calling sh

This problem has bugged me so much and I can't find a solution. Sorry in advance if it is a newbie question. Let's say I have a file called run.sh that contains: #! /bin/sh -x x-www-browser index....
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1answer
5k views

Permissions issue with git

I have a development machine that use runs on CentOs. Whenever i pull from git using git pull i get "permission denied" issue/error. Git apparently doesn't have the permission to overwrite the ...
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1answer
742 views

immutable-like flag for perms

Is there any chattr flag that would allow me to lock a file's unix permissons, and not change them without resetting the flag? The file itself should still be modifiable, I just want to prevent ... ...
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How to suid iwconfig on Debian wheezy?

I have a script running under my own user account that takes care of all sorts of wireless interfaces. It (more or less) intelligently switches wireless LAN off and on and so forth. However, it does ...
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1answer
1k views

/usr/sbin/sendmail: Permission denied

I am trying to setup the mail on my fedora 20. Every time I try to fire a test mail it tells me the permission is denied on /usr/sbin/sendmail. I checked the permissions and this is the output: [...
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setting default permission for directory

Before anyone tags this question as duplicate, I would like to emphasize that I would like to know something extra... I found a way to set the default file permissions for all files created in a ...
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123 views

Do root's supplementary groups behave differently than regular account ones for NFS shares?

OS: Linux CentOS 7, NFSv4 On one machine I exported an NFS share group-owned by the nfsgroup with 2770 privileges for group collaboration: groupadd -g 5000 nfsgroup chown nobody:nfsgroup /home/...
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432 views

How to add a read only group permission to a folder that already has a default group, and have it inherited for all newly created files & folders?

In Windows this is easy. I never fully figured out Linux permissions, I have a directory such as this: /Photos The current ACL permissions are as follows: owner: root - full access group: photos -...
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1answer
298 views

How do I mount a Windows folder on Linux (with Samba) and see the correct permissions?

I have a Windows 7 box and a Linux machine. I can correctly access the files on the Windows machine from the Linux machine. however, when I look at the permissions from Linux and from Cygwin on my ...
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5answers
72 views

Move directory (with contents) to another user's home directory (without sudo)?

I have a directory that I want to move (with its contents, recursively) to another's user home directory. I don't have permissions to write to that user's home directory, but I know his password. I ...
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2answers
1k views

How do I reset ownership on /usr/bin/sudo on centOS? [closed]

I accidentlly changed ownership of /usr/bin/sudo to my current user (i also did this for some other stuff in my /usr directory). I can't change any of them back because I need ownership of /usr/bin/...
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1answer
532 views

Problem when installing “ia32-libs”

I'm using x64 Ubuntu. A few months ago I accidentally messed up the groups/owners of all files on /, but managed to fix it using a VirtualBox install of Ubuntu. Now I'm running into a problem that I ...
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1answer
325 views

chmod 600 fails silently

Here is what happens: $ chmod 600 foobar.txt $ ls -l total 1 -rwx------ 0 sampablokuper sampablokuper 13 Feb 19 21:00 foobar.txt Why is the last line not reading as follows? -rw------- 0 ...
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3answers
867 views

How does gcc handle file permissions?

The executable files that gcc creates have execution permissions -rwxrwxr-x which are different than the permissions that the source file has. -rw-rw-r-- How does gcc set these permissions ?
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2answers
750 views

Gaining root privileges in SCO

I am learning Linux for work, so am still a bit rusty on the edges. I need to change the folder permission of the directory /opt, and I know in Linux, you do the following: chmod 775 /opt I get a ...
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2answers
1k views

warning: Filesystem seems to be mounted read-only

I have an old SGI indigo with an EFS file system (Extent File System ), and the password needs to be reset. I can mount the hard drive, but read-only. I need write permissions. # mount --rw -t efs /...
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1answer
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Why can't I use strace with rsh?

If I run rsh, it works, but prints some strange “Connection refused” messages at the beginning: $ rsh localhost pwd connect to address 127.0.0.1 port 544: Connection refused Trying krb4 rsh... ...
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1answer
216 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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How to mount samba rw because everything fails

I'm trying to mount windows share on my laptop and everything mounts ok but somehow I get permission denied when I try to create new file inside mounted folder. I tried noperm, uid, gid, noacl etc. ...
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Starting a minecraft server using screen doesn´t work properly

I'm trying to run a minecraft server on my vServer. Everything works properly when I start the server like this: java -Xmx1G -Xms1G -jar minecraft_server.jar nogui But I want the server to run in ...
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2answers
1k views

Allow non-root process to access all home directories without compromising security?

Any ideas how to allow one non-root process to access (read&write) all home directories without compromising security? Normal users should not have access to each other's home directories. All ...
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2answers
172 views

File with permissions ---S--l---

Can some one explain what the meaning of these attributes: ---S--l---? When and why need to set this attribute? and for what? $ ls -ltr ---S--l--- 1 root root 0 Mar 10 04:25/opt/sm/...
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1answer
553 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 ...
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2answers
669 views

relation between chmod and sudo on an executable file

What is the relationship between chmod and sudo on an executable file for a user? Are the cases that "a user needs sudo to run an executable" the same as the cases that "chmod hasn't set the ...
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2answers
878 views

“~/” receives a permission denied error in Csh

Running in Csh when using Tilde Notation performing a ~/ at the command line, I receive a "Permission denied." error. This directory is owned by the user performing the command and has the ...
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2answers
135 views

Terminal command (called not from SU) that would restrict process from writing to all directories but one?

We have an app testApp. We have a folder called notRestricted in the directory where we run app from. We want to limit access of the app to file system so that app could write only to that folder (we ...
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601 views

Linux - Windows 8 - Samba - Can see dir and contents but not create

have the following setup Raspberry pi with samba installed and running Windows 8 machine that can see the samba share, access the proper DIR, see all contents In the smb.conf file, at the base of ...
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1answer
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Why do I get “Permission denied” when redirecting the output of sudo echo “xyz” to a file? [duplicate]

Why do I get -bash: test: Permission denied when I run sudo echo "xyz" > test The directory permissions are: drwxr-xr-x 3 root root 4096 2014-08-05 16:26 I have no problem creating a ...
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3answers
81 views

Linux Mint 17.2 suddenly loses write access to filesystem

It may be a hardware problem since I'm using new computer but I'll ask anyway. So it happens sometimes - system becomes unable to write anything on hdd, applications start to crash, I forced to reboot....
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2answers
228 views

Broken system after chmod -R 644 /

I use debian jessie and I have done one of those bad mistakes and broke my system with a mistyped command and worse mistakes that follow in such situations. Trying to fix some permissions I ...
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1answer
870 views

Set sticky bit by default for new directories via ACL?

I want to set up a directory where all new files and directories have a certain access mask and also the directories have the sticky bit set (the t one, which restricts deletion of files inside those ...
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1answer
5k views

How can I flash_erase mtd0?

I am trying to find a way to nandwrite my mtd0 partition which contains my u-boot environment. When I try to flash_eraseall /dev/mtd0 though I get: flash_eraseall: /dev/mtd0: Permission denied ...
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1answer
90 views

Mounting a device without read permissions

It is possible mount a flash drive without read permission?
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New user can't access their home

So I'm adding a new user on a machine to give a family member some remote storage. After setting up their login and home directory. Here's the stat File: `/home/heather' Size: 4096 Blocks: ...
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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
3k views

How do I delete a file in a read-only directory?

I've got a directory and a file in it, with the directory marked as read-only: $ mkdir directoryname $ touch directoryname/filename $ chmod a-w directoryname I cannot delete the file, even if pass ...
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1answer
2k views

Grant FTP access to specific directory

I have setup CentOS on a box on my local network and installed httpd, PHP, Webmin (and UserMin) etc. I opted for ProFTPd and have opened up ports for FTP, Webmin and Apache. I can now access Webmin ...
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1answer
50 views

How to group alphanumeric permissions

As an addition to my previous question: Which is more widely used: chmod 777 or chmod a+rwx. If I were to use the chmod a+rwx (which I wouldn't in the real world) format, but I wanted to use the ...
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2answers
580 views

How to backup /etc/{,g}shadow files with 0000 permission?

I am trying to backup several servers' /etc by using rsync from another server. Here's a relevant snippet: PRIVKEY=/path/to/private.key RSYNC_OPTS="--archive --inplace --no-whole-file --quiet" ssh -n ...
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1answer
52 views

/bin (and sub) default permissions

Absolute noob here, I'm loving every last bit of Linux but I'm still at the very first steps. And apparently tonight I managed to work out my first royal screw up, most of all I really hope answers ...
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Prevent directory permission change (or cronjob to work around)

I have a HostGator dedicated server running CentOS. I have a folder on one user's account where I want all users to be able to have read access, so we keep it chmod'd to 755. HG has a script that runs ...