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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0
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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 ...
2
votes
1answer
31 views

What relationships do tie ACL mask and standard group permission on a file?

At first I create a file and check it's standard permissions and ACL entries: $ touch file; ls -l file; getfacl file -rw-r--r-- 1 user user 0 Jul 30 16:26 file # file: file # owner: user # group: ...
2
votes
1answer
25 views

How can I set device rw permissions permanetnly on raspbian?

Im using Raspbian (distribution made for Raspberry Pi based on Debian). I have some scripts that use i2c. Normally only root has read and write permissions for i2c. Im using this command to add i2c ...
0
votes
1answer
16 views

Debian file's permissions for secondary's group of user

I am installing a proftpd server on a debian dedicated server, In order to be able to update some website files in this folder : /var/www/website I have added a new user : my-ftp-user This user's ...
-1
votes
1answer
19 views

A command showing if I have the right to perform writing?

I'm searching for a command which only says if the current user has r-rights (read) on the file passed as a parameter. This command could be something like haveIRights -x <file> and it has to ...
12
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4answers
2k views

How does the OS know that a command needs sudo?

When you run an executable, sometimes the OS will deny your permission to. For example running make install with the prefix being a system path will need sudo, while with the prefix being a ...
1
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2answers
42 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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votes
2answers
50 views

How to you create directories and set permission? [on hold]

How do you create three directories in /storage named campaigns, financials, and public. Also, I'm wondering how to set the file access permissions as follows: campaigns – marketing group has full ...
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votes
2answers
31 views

How do I run as a limited user while logged in as Root, and another question

Is there a way to, on linux, do: run as limited user when logged in as root? (like sudo but vice versa, so instead of GRANTING rights, it limits them, i.e., for use with "bundle install" for missing ...
4
votes
2answers
190 views

Should /usr owner be root?

After having installed the MySQL database on openSUSE I realized that for all files in /usr/bin the owner was changed to the "mysql" user of the "mysql" group. Maybe there was some mistake of mine. ...
1
vote
1answer
108 views

How to disable local file writes?

I maintain a shared public computer. Every user has their own directory in /home. We don't like to make /home a network mount because it takes a long time for new users to login, but we would like to ...
0
votes
2answers
44 views

-bash: /dev/null: Permission denied

I'm trying to create a new user on a Centos 6 system. First, I do useradd kevin Then, I tried to run commands as that user su - kevin However, I get the following error messages -bash: ...
1
vote
1answer
36 views

How can a permission a directory so that a user can list the contents, but cannot read them

I am setting up a vstpd FTP server where people can upload files to be processed. I want them to be able to write and see the list of files, but not actually download them. I'm using virtual users ...
1
vote
2answers
51 views

Unable to get rid of root user and privileges

I am told that the most basic security to set up in Linux is to change the superuser name from root to something obscure so I run these steps to add new user $ /usr/sbin/adduser new_username $ ...
1
vote
2answers
59 views

-bash: cd: .ssh/: Permission denied

When I type in cd .ssh in terminal, it returns with -bash: cd: .ssh/: Permission denied. Now I cannot add my ssh keys to ssh. When I type ssh-add ~/.ssh/idname it says /Users/Dan/.ssh/idname: ...
0
votes
1answer
27 views

Give a user the permission to access files in a directory

I have mounted a volume from NAS storage to my Solaris 10 machine using NFS. I want to give read/write permission for a user to the directories and subdirectories and files. I have tried setfacl -m ...
2
votes
1answer
39 views

Changing file permissions on an HFS+ filesystem

I ran the command fdisk -l to find out what my external drive is formatted to, I found out it's uses GPT partitions and the filesystem is HFS+. When I try and create a new folder on the external ...
0
votes
2answers
42 views

need give read write access to a folder and its subfolders and directories for a particular user

Could you help me to provide read/write access to a folder, its sub-folders and all the files below for a particular user? I tried to use the getfacl command, but didn't find a solution. I'm using ...
2
votes
1answer
44 views

What to do when you removed execute permission from some system binaries or libraries?

It seems I removed executability from system binaries, resulting in loads of Permission denied. Do I have to force reboot into host's rescue mode or is there something else I can do while I'm still ...
3
votes
1answer
56 views

groupadd failure while writing changes to /etc/group

I have been following this guide on installing debian-kit on my Sony Xperia Tablet Z and the installation goes fine until I try to apt-get install andromize which fails with the error groupadd: ...
3
votes
1answer
25 views

How to make a cifs/smb mount ignore umask?

I have a cifs mount that is mounted from /etc/fstab. But I would quite like creation of files/dirs on that share to ignore my umask. Is that possible? It seems that cifs does not support the umask=000 ...
2
votes
1answer
145 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: ...
0
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0answers
16 views

Map a network share folder in Debian with read-write permission

I want to mapped a folder on samba server at Debian Squeeze startup. I found a guidance by google as following: Open file /etc/fstab and add line //server/share /mnt/dir smbfs ...
0
votes
2answers
31 views

Why can't my python script change umask?

This is my script #!/usr/bin/python import os print "hello world from python" os.system("echo 'hello world from bash'") os.system("umask 055") os.system("ls -alh > test") If I run this code ...
1
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1answer
36 views

Using scp to transfer files to an android device

I have a file on a remote server that I want to transfer to my android device over ssh, only using the android device in the process. Using this setup, I tried an scp from the android device ...
2
votes
1answer
83 views

Why can't mv preserve permissions when moving between Android SD cards?

After mounting both SD cards on an Android phone using the "USB mass storage" mode I keep getting these messages when moving files between them: mv: failed to preserve ownership for ‘/.../foo’: ...
4
votes
1answer
113 views

Find directories and files with permissions other than 775 / 664

I am moving a website from one server to another and Git does not store metadata such as file permissions. I need to find the directories and files that are not 775 / 664 respectively. Right now, I'm ...
2
votes
1answer
23 views

Desktop app run by admin user (but not explicitly with sudo) takes file ownership of shared file

Similar to http://stackoverflow.com/questions/15143614/file-ownership-changes-to-root-after-saving-from-a-program-in-ubuntu but I can't use the answer since I'm not running a command-line app as sudo. ...
1
vote
1answer
40 views

How can I tell why I have permissions to read a file? [closed]

Here's what I just noticed on my CentOS SSH account: stat output $ stat /dev/kvm File: `/dev/kvm' Size: 0 Blocks: 0 IO Block: 4096 character special file Device: ...
0
votes
1answer
27 views

Symbolic link permission changes [duplicate]

I would like to change the symbolic permission[lrwxrwxrwx] to 755. I've used the command to try and change the permissions and it's not working. $ chmod -R 755 symbolic link folder
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0answers
42 views

Permission denied when running logrotate with anacron

I am trying to figure out what is causing anacron to send me the following error message: /etc/cron.daily/logrotate: /var/log/mariadb/mariadb.log-20140710.gz: Permission denied error: error running ...
1
vote
1answer
48 views

sudo chown -R $USER:admin /usr/local - revert back to ROOT?

On OS X, but may also apply to *NIX. This question was asked/answered previously, and I know it's safe to chown on /usr/local for my admin user account, which I've done to install git with homebrew ...
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0answers
17 views

server migration experiments

At our premise, we are going to have to migrate some servers. I'm making some experiments for try to make all the silly stuff before put hands on real servers. I got 2 raspberry Pi, installed ...
3
votes
1answer
213 views

What permissions do I need to write to a card reader?

I have a card reader attached on /dev/sdb. What I do is giving all permissions to owner, group and the rest of the world, using: sudo chmod 777 /dev/sdb Can I just use another combination, ...
-1
votes
1answer
50 views

How do I properly allow user jenkins to write to a specific directory under user minecraft home directory?

I am using Jenkins, I want to copy a file from the Jenkins directory in to the minecraft user directory, but I am not sure how to go about this, as when I run cp build/versions/*.info ...
5
votes
2answers
137 views

Why ssh-agent group ownership is not root

Trying to understand why ssh-agent has sgid bit and found this post ssh-agent has sgid I have another question, why the group ownership of ssh-agent is nobody not root? What is the reason behind it? ...
4
votes
1answer
124 views

View List of Sudoers with No Sudo Priviledges

If I'm not a sudoer, is it possible to view the list sudoers? Does /etc/group show this information?
6
votes
2answers
111 views

Why do some applications stop working when permissions are changed in /usr/bin?

On OS X, a friend of mine changed the permissions on /usr/bin recursively using Finder, in order to grand write access to everyone. Here is how it's done: Go to /usr/bin in Finder, then mess with ...
3
votes
1answer
70 views

How to ignore -ls errors in find

I'm writing a find command to look for files or folders with broken permissions (files should be rw, directories rwx) and trying to ls -l (give or take) the results. The following find command looks ...
0
votes
1answer
33 views

Is it viable to have a file with 700 permissions?

I have been wondering about the following thing: Consider Pc A. Pc A has n users. There is a folder with one file per user. There is some sensitive information for each usere there, so you don't ...
4
votes
2answers
62 views

777'd some files. How do I repair SSH?

So I'm messing around on a test server and accidentally ran the following (which resulting in SSH breaking): # chmod -R 777 /var Because it's a test server, I'd rather not re-install right now, I ...
2
votes
2answers
38 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 ...
2
votes
1answer
37 views

Copy file from USB drive to a desktop loaded via a LiveCD

I have booted my computer using a LiveCD and want to copy a file from a USB drive to the LiveCD loaded desktop. I want to copy a file from the USB drive to the desktop environment in memory, which ...
-1
votes
0answers
31 views

Can't overwrite a file with WinSCP

I don't know how to fix this problem. I'm using WinSCP (on Windows) when I want to remove or edit admins in a file on a Linux system, user.ini. When I click save it gives me this error: General ...
3
votes
3answers
261 views

What are the world writable directories by default?

In a standard Linux filesystem, which of these common directories are world-writable by default? /tmp /etc /var /proc /bin /boot /.... .... Why are they world-writable? Does that pose ...
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0answers
62 views

Limit program execution to a list of arguments

I would like that my Unix users can only run a specific command insecurecommand with a controlled list of arguments stored in a file. The only solution I have found at this time is to : Create a ...
4
votes
3answers
131 views

Why does file ownership matter within an RPM or DEB package?

Context: I'm trying to convert a .deb package to .rpm using alien, I use this command: $ alien -r foo.deb but it complains thusly: > Warning: alien is not running as root! > Warning: ...
4
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0answers
31 views

No elevated permissions when using GUI applications on i3 wm

I'm running Lubuntu 13.10 with the i3 window manager. Tasks that need elevated permissions, like installing applications from the lubuntu software center or using the gnome-disks, complain about not ...
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0answers
79 views

Can't delete 777 file with permissions on parent directory

As my VCS I use git version 1.7.10.4 . However, when trying to perform a pull, I got the following message: error: unable to unlink old 'somedir/config.php' (Permission denied) So what I did is: ...
5
votes
1answer
129 views

Give user permission to rm without password or sudo

I'm trying to give the ubuntu user on my machine the ability to rm folders and files (mainly in the /www/ folder) without the need to invoke a password or the need to use sudo. I've been following ...