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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.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 ...
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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
495 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
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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
724 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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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 ...
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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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1answer
318 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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268 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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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 ...
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Noip “Can't locate configuration file”, but the file is there

I installed Noip and ran the command which created the config file /usr/local/bin/noip2 -C and then I ran the run command /usr/local/bin/noip2 and it returned Can't locate configuration file ...
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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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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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1answer
80 views

Mounting a device without read permissions

It is possible mount a flash drive without read permission?
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Linux empty buffer cache command permission denied

I'm using the following commands to flush cache: # sync; echo 3 > /proc/sys/vm/drop_caches # sync; echo 2 > /proc/sys/vm/drop_caches # sync; echo 1 > /proc/sys/vm/drop_caches When I use ...
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1answer
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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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2answers
553 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
5k views

Filesystem suddenly read-only?

I've been storing some files on a MicroSD formatted to ext4 that I connect via USB. I tried to move a directory in it to an external hard drive, and I got mv: error reading ...
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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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“~/” 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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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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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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Terminal command (called not from SU) that would restrict process from writting 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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1answer
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/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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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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'+' and 's' in permission strings

If the ls -l command gives me a permission string like rwsr-s--x What does the 's' mean? The only sources I found mention that it can be present sometimes but do not elaborate. What does a '+' ...
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Sudo User: Not able to see the home directory of other users

I created sudo user hrsupport with following commands: hrsupport ALL=ALL, NOPASSWD: /bin/chown, /bin/chmod, /bin/chgrp, /scripts/pkgacct, /scripts/restorepkg How can I achieve this The hrsupport ...
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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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712 views

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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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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1answer
2k 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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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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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 ...