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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Write-only permission for a directory doesn't allow to rename (move) files inside?

In fact, I would like to ask more general question -- "what does write permission for a directory allow you to do exactly?" -- but let's approach it with a concrete example. It is a long question, if ...
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1answer
1k views

Help with giving group permissions to other user's files

I'm a linux beginner using Debian 7 and have created a new user (a website) with an htdocs directory like this: $ sudo adduser website $ sudo mkdir -p /home/website/htdocs $ sudo chown -R website ...
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1answer
6k views

File inheriting permission of directory it is copied in?

I have files created into my home directory with only user read permission (r-- --- ---). I want to copy this file to another directory /etc/test/ which has the folder permission of 744 (rwx r-- r--). ...
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1answer
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permission denied for ptrace under GDB

I initially posted this question on StackOverflow, as a GDB problem. I didn't find a solution there, but they did help me find that it's a permissions problem, so I'm posting it here. I have set a ...
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1answer
2k views

Running executables on an NTFS partition?

My system configuration is the following: UEFI computer Dual-boot with Windows 8 and Linux Mint 15 Olivia I would like to be able to run Linux executables that are stored on an NTFS partition ...
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1answer
1k views

How are file permissions applied to newly created files?

I have a directory that has the following permissions set: drwxr-s---. user group folder On the desktop, I access this folder and right click to create a new file call foo.txt. Then using the ...
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205 views

File permissions and saving

Let's say you open a file on which you have write permission. Meanwhile you change permissions and remove write permission while you still have the file open in some editor. What will happen if you ...
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381 views

Running user script with root permissions

I have a script that I've made that needs to have root permissions to enable and disable bluetooth features. I am binding this to a button so it is not feasible to log in as root to run the script. ...
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2answers
2k views

Taking file ownership when file and directory is readable/writable

I got some files in directory: drwxrws-wt 2 me mygroup 4,0K 10.1. 12:34 . -rw-r----- 1 someone mygroup 10G 10.1. 11:22 someonesfile me and someone are regular users without supplementary ...
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1answer
495 views

What does it mean if a directory has only x (executable) permission for certain user/group?

I stumbled across the directory /etc/ssl/private on Ubuntu (12.04), it has following permission: drwx--x--- 2 root ssl-cert 4096 7月 8 2012 private/ I wonder what does this mean for group ...
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1k views

A question about permissions of hierarchical directories

I have some directories, with following permissions: drwxr-xr-x 18 user1 root 4096 Oct 27 11:25 /home/test1/test2 drwxr-xr-x 24 user1 root 4096 Oct 21 08:38 /home/test1 drwxr-xr-x 492 root root 12288 ...
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356 views

Setting execution right to whole directory - is it good or bad idea?

I have a zip file containing lot of files and directories for a certain application which should be running on Linux. Some files needs to be set as executable, but the zip file format afaik does not ...
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4k views

how to chown mounted device?

When I plug in my external hard-drive when running KDE, it prompts me to mount the device (by clicking an icon, no sudo involved), and once I've done that I am the owner of the files. This is great. ...
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1k views

What directories/file permissions should i ensure are set?

I have a similar question about default software configuration. For this question i would like to ask What directories/file permissions should i ensure are set? Aprrently Is it normal to get ...
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4answers
293 views

Backup script permission issue

I have a server with a user named deploy-user and have written a backup script to backup a number of websites associated with this user. However one of the sites I'm trying to backup has a directory ...
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2answers
57 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
27 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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2answers
75 views

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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2answers
109 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 ...
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3answers
64 views

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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4answers
4k views

'chmod g+s' command

Hello I want to understand the role of the chmod g+s command in Unix. I also would like to know what it does in this particular context: cd /home/canard; touch un; chgrp canard .; chmod g+s .; touch ...
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1answer
78 views

Different write behavior for owner and member of group despite 775 permissions

I have mounted a remote share via my fstab using the line: //path/to/target /media/f cifs gid=<mygroup's id>,dir_mode=0775,file_mode=0775 0 0 As a result, everything under /media/f winds up ...
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1answer
79 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 ...
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1answer
164 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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1answer
189 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
804 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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1answer
309 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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3answers
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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
819 views

How do I grant someone else access to my linux server

If you administer a Linux server, what steps do you take to properly grant someone else access? Assuming they will log in over ssh, don't already have an account, and will need root access. ...
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1answer
173 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
2k views

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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608 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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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
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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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1answer
11k views

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
471 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
4k 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
692 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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1answer
77 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
77 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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1answer
531 views

Difference between owner/root and RUID/EUID

I am relatively new to the concepts mentioned in the question and reading about them from different sources only makes them more confusing. So this is what I understood so far: When we are given ...
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1answer
659 views

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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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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2answers
376 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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1answer
69 views

Mounting a device without read permissions

It is possible mount a flash drive without read permission?
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3k 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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479 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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4k 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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4answers
9k views

What type of permissions should a user's home directory and files have?

I'm working with a fresh install of Ubuntu 12.04 and I've just added a new user: useradd -m testuser I thought that the -m flag to create a home directory for users was pretty standard, but now ...
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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. ...