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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3
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2k views

What causes files to lose permissions?

There's been more than one occasion where something has gone with system because all the sudden there were permision changes to certain key files (sometimes taking a long time to find which file is ...
4
votes
2answers
193 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 ...
0
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0answers
20 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 ...
2
votes
1answer
22 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 ...
3
votes
1answer
100 views

Two users with different permissions on same directory

Is it possible to give two users different permissions on the same directory? I want to use it for ftp: userFull gets R+W and userLim gets only Read, depending on who logs on. Im getting stuck on the ...
1
vote
1answer
17 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 ...
6
votes
1answer
3k views

Keep same file owner for newly created files

This question is regarding samba file access. I have created a folder A, and under folder A created two folders B and C. And also created three users A, B and C. User A has access to all three ...
0
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1answer
38 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 ../ ...
1
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1answer
46 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 ...
2
votes
1answer
575 views

How can I get write access to my usb drives?

I have trouble writing to external drives. They are monuted automatically in Nautilus, but I can not copy anything there ('Paste' and 'create Folder' are just greyed out). Does Anyone have ideas what ...
1
vote
1answer
130 views

reliable way to give all read/write access recursively in CentOS 7

What is the most reliable way to give all users read/write privileges for a given directory and all of its subdirectories and files in CentOS 7? In an eclipse web application project that uses ...
9
votes
2answers
18k views

“rsync: failed to set permissions on …” error with rsync -a or -p option

When I use the -a option as is asked and answered in Preserve the permissions with rsync, I got a lot of "rsync: failed to set permissions on" errors. rsync: failed to set permissions on ...
3
votes
1answer
752 views

How do I allow user permissions to data on a Couchpotato and Sickbeard Plugin using Freenas

Trying to setup permissions for the plugins sickbeard / couchpotato. I’ve read almost every thread google / the forums have but haven’t really found a solution yet. I’m assuming it’s the data here: ...
0
votes
1answer
14 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 ...
2
votes
2answers
38 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 ...
6
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 | ...
5
votes
2answers
977 views

Directory special permission problem

When I write: chmod g=rws,u=rwx,o=rx folder_name I get: drwxrwSr-x But S is not the same as s, right?
1
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0answers
18 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 ...
1
vote
2answers
17 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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votes
2answers
28 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:/$
2
votes
2answers
590 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 ...
0
votes
2answers
973 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 ...
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0answers
4 views

Set wordpress permissions correctly on Centos 6.5 VM + apache 2.0 [migrated]

I've a Centos 6.5 VM with apache 2.0. I'm tring to understand how wordpress permissions should be set, in order to have a safe environment and make it update via Wordpress UI rather than ftp. This is ...
2
votes
1answer
26 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: ...
0
votes
1answer
31 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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0answers
18 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 ...
2
votes
0answers
43 views

Why does file-roller appear to have lower priviledges 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 ...
19
votes
5answers
3k views

Understanding UNIX based permissions and their attributes

I've never really got how chmod worked up until today. I followed a tutorial that explained a big deal to me. For example, I've read that you've got three different permission groups: owner (u) ...
4
votes
1answer
74 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 ...
0
votes
1answer
33 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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0answers
42 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 ...
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0answers
35 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 ...
3
votes
2answers
163 views

Why can't I delete this file as root?

I have directory exam with 2 files in it. I need to delete files but permission is denied. Even ![rm -rf][1] command can't delete these files. I logged in as a root user.
1
vote
1answer
28 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 ...
1
vote
0answers
23 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 ...
2
votes
2answers
58 views

How to recursively check if a specfic user has read access to a folder and it's contents?

I need to pass a user and a directory to a script and have it spit out a list of what folders/files in that directory that the user has read access to. MS has a tool called AccessChk for Windows that ...
0
votes
1answer
12 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 ...
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
21 views

User in the same group new/edit files permissions

I have a few users under the same group. However, when they all work on the same folder via winscp, whenever they open a new file, they open it with themselves, as the owner. Thus, when someone else ...
1
vote
2answers
27 views

How to get rsync to complain if user not found

I'm moving files over from my old server to my new server. By the time I'm doing it for real (as opposed to just testing) I'll have all the "user" users (the non-system users, i.e. >= 1000) created on ...
0
votes
3answers
40 views

What rights signify when using ls -l? [duplicate]

When I type ls -l and press enter I get a list of files, with details about each file. Next to each file there is permissions and rights for each file. What do they mean? For example: -rw-rw-rw- I ...
2
votes
2answers
27 views

In find -perm, what's the difference between “+6000” and “/6000”?

I'm trying to find all the setuid/setgid binaries on my system. I've found two different ways to do this online. What's the difference between find / -perm +6000 -type f and find / -perm /6000 ...
1
vote
1answer
18 views

How do you use 'find' to update ownership of all directories, files, and symbolic links in a folder?

I'm trying to update the ownership of everything in a directory tree from me to root. I'm using find to do it a little more carefully than a recursive chown. Here are the commands I use to change ...
0
votes
0answers
23 views

Can't run customlog and errorlog in custom directory for apache in centos7 [duplicate]

I can't make my customlog for apache in different than default directory. I think that it has to be something with access rights but have no idea what. httpd.conf - log config journalctl -xn ps ...
2
votes
1answer
22 views

How to guard a set of folders from being written into by a specific process?

I would like to have a way in which a set of folders do not allow write access for a particular process. For example, I would love to have a way in which YUM/RPM is not allowed to write into /usr/bin ...
2
votes
1answer
27 views

How can I use setfacl to give no access to “other” users?

The command setfacl -dm g::rwx mydir sets permissions for groups to read-write-execute. I'd like to run a similar command such that other users (i.e. not the owner) have no access whatsoever, but ...
4
votes
1answer
65 views

Hard link permissions behavior different between CentOS 6 and CentOS 7

I'm getting a permissions error in CentOS 7 when I try to create a hard link. With the same permissions set in CentOS 6 I do not get the error. The issue centers on group permissions. I'm not sure ...
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vote
2answers
41 views

shell or perl script to check group have read privileges

ls -l drwx------ 8 ws web 1024 Apr 29 2013 abc drwxr-xr-x 8 ws web 1024 Oct 19 2011 def I need some script to find directories like abc which doesn't have read/execute permissions ...
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 ...
1
vote
1answer
38 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 ...