chmod is used to change the commonly used read, write, and execute permissions on files. It can change these permission bits for the file owner, the file's group owner, and everyone else. It can also change the more esoteric ‘permissions’ (attributes, reall) like set-user-ID, set-group-ID, and ...

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2answers
59 views

How to make an existing directory (and sub-directories) to be suddenly writable by ROOT ONLY?

Let's say i have a directory, at: /tmp/uploads/ And inside got several recursive directories and files created by DIFFERENT USERS before. So now, suddenly how do i make that above directory to be ...
-2
votes
1answer
201 views

How to make a NON-WRITABLE directory?

Actually i'm aware of a "PHP Web Folder". There seems to be some potentials of incoming attacks. So that i want to make sure this whole directory is READ-ONLY (Only writable by ROOT). Let's say the ...
8
votes
8answers
13k 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 | ...
15
votes
3answers
2k views

Purpose of permissions such as 0111 or 0333

What is the purpose of Linux permissions such as 111 or 333 (i.e. the user can execute, but cannot read the file), if the ability to execute does not automatically imply the ability to read?
1
vote
2answers
622 views

How to Change Owner of a Directory

EDIT: The problem was that Apple uses permissions to mark backups and prevents you from modifying them (probably a security feature). By using chmod -RN <dir> I removed ACL data from all the ...
1
vote
3answers
880 views

Directory appears as file?

So we copied some photos in a directory across to a NTFS partition last night, and they were viewable from ubuntu. Today the directory is not accessible from Windows, and when we booted back into ...
0
votes
1answer
417 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
vote
1answer
1k 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 ...
5
votes
2answers
1k 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
vote
2answers
80 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 ...
11
votes
3answers
103k views

Create file in folder: permission denied

I'm a newbie in the GNU/Linux-Ubuntu world. I have a problem copying files to a directory on Ubuntu 12.04. I create a directory in the home directory so that the path where I want to copy to is: ...
1
vote
1answer
201 views

Linux Root group change chmod for root owned to 770

I'd like to have normal user account assigned to root group (which I've done already) and change mod of all files that are owned by root user to 770, If I understood it well in result of that every ...
1
vote
1answer
67 views

How to delete stubborn directory?

I'm having issues with dropbox so I'd like to uninstall and reinstall it. To do so I need to remove ~/.dropbox-dist but no matter what I do it won't budge. If I run ls -l I get: drwxr-xr-x 3 user ...
7
votes
3answers
1k views

How do Linux permissions work when a process is running as a specific group?

This is something I haven't been able to find much info on so any help would be appreciated. My understanding is thus. Take the following file: -rw-r----- 1 root adm 69524 May 21 17:31 ...
1
vote
1answer
2k views

How to create a Samba share that is writable from Windows without 777 permissions?

I have a path on a Linux machine (Debian 8) which I want to share with Samba 4 to Windows computers (Win7 and 8 in a domain). In my smb.conf I did the following: [myshare] path = /path/to/share ...
0
votes
1answer
50 views

What's the inverse of the X mnemonic in chmod?

Is there a way other than find … -type f -exec chmod -x {} + to remove the x bit from u, g and/or o recursively with just chmod? The X mnemonic in chmod allows one to recursively set permissions on a ...
0
votes
1answer
42 views

File Permissions issue from same group

I have a folder that I haven't created and belongs to a web-group group. Even though my username is under that group I can't modify files or create new ones without doing sudo. When I do the ...
3
votes
1answer
185 views

How to create a folder which will change its contents’ ownership to what the folder has?

In a GNU/Linux OS there is no way to change ownership of a file until you are root. But what if I want to hide my system’s username e.g. before sending a file to someone, because some things like tar ...
1
vote
3answers
399 views

How to change the permission and group-owner of a file at the same time

For changing file permission, I know I could use chmod. For changing group-owner, I could use chgrp. However, if I want to change both permission and owner at the same time, any command I could use on ...
0
votes
0answers
81 views

kickstart does not chmod a file in %post section

I have the following code executed in the %post section of a kickstart file for RHEL 6.6. echo '#!/bin/sh' > /root/add_user echo 'if [ $# -lt 1 ]; then echo "no username provided"; exit 1; fi' ...
2
votes
1answer
62 views

What are the minimum privileges the owner needs on a file to still do a chmod on a file?

I have a file with 020 privileges on the file, and I can't delete it or perform a chmod on the file. Do you know what the minimum privileges the owner needs on a file to still do a chmod on a file? ...
2
votes
1answer
109 views

Setuid, SUID bit not providing root privileges

I've written and compiled a short program to allow any user to change the contents of my /sys/class/backlight/intel_backlight/brightness file, but I fail to escalate their permissions. What could I be ...
1
vote
1answer
186 views

Sticky bit and users with sudo permission

Let's say I chmod 1777 a folder /opt/test and all files inside it as user user1. Hence user2 is able to update and edit files inside the /opt/test directory. When user2 operates via sudo, he's able ...
2
votes
2answers
42 views

Broke permissions on /bin, /boot, and /dev; how to clean the mess?

I just made a terrible mistake, I tried to fix it by myself but I need some help. Due to a syntax error all files and folders permissions were being changed: thankfully I saw this while it was ...
4
votes
3answers
218 views

mkdir permissions do not correspond to umask (change depending on location)

Whenever I create new directories in my home (or its subdirectories) they do not have write permission, even though umask is set correctly. Files I make DO have write permission. [mmanary@seqap33 ~]$ ...
1
vote
0answers
33 views

Centos 7 FTP Hidden Directory Issue

After setting up Centos 7 with a web server standard install and LAMP stack. I installed vsftpd. Everything works fine and configured it to accept passive to enable gui ftp programs. However, when ...
0
votes
1answer
291 views

Accidentally removed execute permission from root directory.

I accidentally did chmod 770 / which removed all access to the system. I booted to rescue mode, dropped to root shell and tried to chmod 755 /, but I get message changing permissions of /: read-only ...
-1
votes
1answer
53 views

enable to write to file inspite we remove all file permissions

something isn’t clearly for me when I remove all permissions from file as chmod 000 I expected to get permissions denied when I write to file but still I can write to file as the following example can ...
0
votes
0answers
265 views

DD-WRT: /tmp exec permission

After making a simple hello world OpenWrt package I installed it to the /tmp folder on the dd-wrt device. The program shows up in ls /tmp but when I try to execute it, it shows me /tmp/helloworld: ...
17
votes
4answers
10k views

Wrongly set chmod / 777. Problems?

I was trying to run chmod -R 777 ./ but ended up typing chmod -R 777 / and set 777 on my entire machine. What can go wrong? How can I fix it?
0
votes
1answer
156 views

Mess with permission files [duplicate]

i've written chmod 755 /etc/ and chmod 0644 /etc/ and now i find myself without access to anything,and inside the terminal where before there was username@system1: now there's I have no name!@system1: ...
2
votes
1answer
128 views

Why does chmod succeed on a file when the user does not have write permission on parent directory?

I am trying to understand file/dir permissions in Linux. A user can list the files in a directory using cd test ls -l Even if the user issuing above commands does not have read, write or execute ...
0
votes
4answers
168 views

Applying different permissions to files vs. directories

Sunny answered the question above in this post, The answer was given as No need for scripts. // Directories: find . -type d -exec chmod XXX {} \; // Files: find . -type f -exec chmod ...
3
votes
2answers
233 views

Setting correct permissions automatically for certain file type when file is copied from non-Linux file system

The main reason I want this is my heavy use of dircolors, especially for ls --color=auto. For example, whenever a .mp3 file is copied from NTFS, it will have permissions set by umask 022 which ought ...
-9
votes
1answer
119 views

What does the -R switch mean when used with chmod or chown commands?

I'm just trying to get up to speed with permissions in Linux. I've come across an example which uses "-R" when changing permissions and ownership of a directory. What does the -R mean?
-1
votes
1answer
37 views

Can this be done in a one-liner? [duplicate]

Is there a way to do these two lines of code in one line? nc -l 17500 > listenToNetcat.txt chmod 754 listenToNetcat.txt
-1
votes
2answers
16k views

How to set the permission drwxr-xr-x to other folders?

I have few directores inside a folder like below - teckapp@machineA:/opt/keeper$ ls -ltrh total 8.0K drwxr-xr-x 10 teckapp cloudmgr 4.0K Feb 9 10:22 keeper-3.4.6 drwxr-xr-x 3 teckapp cloudmgr ...
5
votes
5answers
1k views

What are the root permissions for a file?

If I type: ls -l file.txt I see that the rights for that file are equivalent to "456": 4 = owner (r--) 5 = group (r-x) 6 = others (rw-) Which the rights for root in this case? Does it have 777? ...
1
vote
1answer
69 views

File that is only readable with root privileges

I have a binary file that needs to run at startup on all accounts (including unprivileged user accounts), so a command to run it will be put into /etc/rc.local. The program itself will have only ...
2
votes
5answers
230 views

Why can't I delete my files?

I copied some files from a data DVD to /home/emma (ext4), and all of the files are read only. This is what all of the files are like: emma@emma-W54-55SU1-SUW:~$ stat cd/Drivers/Drivers_List.rtf ...
2
votes
1answer
148 views

execute chmod on boot time on headless debian

I am programming a (web based) POS system, dedicated to be running on a debian based ITX-server with apache2 etc. Currently I am using Lubuntu 14.04 LTS for development (and for the 1st customer) with ...
1
vote
0answers
37 views

Capital S in file permissions [duplicate]

I issued the command sudo chmod 700 <directoryname> in the hopes of getting the permissions for that directory to look like drwx------ Instead, they look like drwx--S--- Why does this ...
1
vote
1answer
218 views

Permission 0000 in /var/www/html through the sFTP

I can write in /var/www/html through the terminal in ssh, but to create a file by sftp through Filezilla, the file created have permissions 000. How do I fix this? My problem is with these ...
1
vote
1answer
264 views

How do I transfer files over ssh and also change their permission on the remote server without having to log in twice

guy@home~% scp file.* guy@server.server.com:/users/guy/public_html/kool-stuff/ Ok so this transfers some files. Then I usually have to login in another terminal and do this in order to make them ...
1
vote
1answer
51 views

Still able to read file after changing permissions

I've made a file as root, and written a string in it. Now I've changed mode to "0" like this: root# ls -al transit/ total 4.0K ---------- 1 root root 6 Jan 5 18:15 27050 root# If I try to tail, ...
0
votes
1answer
114 views

Multiple users' access to directory

I'm running Arch Linux. My website's files are in /home/user/www/ directory. Another users also have their website's files in /home/foo/www/ directories. Now if I want to change something on their ...
1
vote
1answer
888 views

Setting up permissions for common folder

I am trying to setup a little home network using Linux as the File Server and have run into a bit of problems w.r.t. to folder permissions that I can't seem to solve. The setup: An Ubuntu 14.04 ...
2
votes
1answer
157 views

files saves to ntfs drive adhere to umask, ext4 does not

I have 2 storage drives, 1 is ntfs and the other is ext4. Both mounted in /media as Storage_1 and Storage_2 I've run chmod -R user:user /media/Storage_* I've tried putting umask=022 in ...
-1
votes
2answers
85 views

Adding setuid permissions to a file

I am hosting a php application on my CentOS 5 server. The application runs some commands via a ssh file called openmgr. For that I want to give a permission of -rwsr-xr-x to the file. I tried chmod ...
0
votes
1answer
114 views

Preventing user from accessing parent folders [duplicate]

I have a user who I only want to be able to access /var/www/ucp/ (his home directory). I have executed the following command on the / directory, the /var/ directory and the /var/www/ directory: chmod ...