Questions tagged [chmod]

A Unix tool for changing file permissions

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Is it possible to get write/read permissions back after removing *all* read/write/execute permissions with chmod?

I accidentally removed all the permissions from a file. Now I don't have permission to chmod it. Is there any way of chmod(ing) the file back? Thank you
nunocaldeira's user avatar
6 votes
4 answers
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Making Apache able to write to PHP files with PHP running as DSO?

I have PHP running as a DSO. As such, my installer script (which writes to a config file) can't do any writing. How do I give apache (user: nobody) the ability to write to the file?
Rob's user avatar
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6 votes
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chmod all files (including hidden files) in a directory in Linux (not recursively)

Yesterday I did something stupid which I today realised. I ran: /root# chmod o-rwx * .* This supposed to remove read, write and execute permissions for the world on all files in the current ...
Lekensteyn's user avatar
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chmod of 400,000 files inside multiple subdirectories?

Howdy... I'm looking to chmod 777 a whole bunch of files. Alternatively, since it's more secure, I could also settle for a chown www:www of these files to make them web accessible. Now, since I have ...
Julian H. Lam's user avatar
1 vote
1 answer
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Why cannot I create a file in a folder I own with chmod 655, but 755 works?

I have a backup folder owned by a system user (mongodb) and chmoded 655. When I try to create files in it, it raises a permission issue: root@maquina:/var/backups/mongodb# su -s /bin/bash mongodb -c "...
Thibaut Barrère's user avatar
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3 answers
3k views

chmod a+x to all directory and content

I am trying to install a library called libtool i am getting "./configure: line 2668: libltdl/config/mkstamp: Permission denied" when i do ./configure how can i chmod a+x all the libtool directory ...
Utku Dalmaz's user avatar
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setgid and group write - possible for recursive directories?

I'd like to set the gid bit so the child files/folders will be set to a specific group. But I noticed that the permissions for group are only set to read and execute, not write - by default at least. ...
Chris Drumgoole's user avatar
2 votes
2 answers
1k views

CHMOD in web hosting

my Hosting is use Apache and PHP i understand what it's mean 777 in CHMOD or drwxrwxrwx or Owner, Group, Public => read, write, execute. i understand with the RW CHMOD command but what about the X, ...
GusDeCooL's user avatar
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3 answers
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chmod issue with particular user

I'm starting with chmod. I've set up a group and gave them permission (777) and every user inside the group is able to do whatever they want inside the directory /www/. However, I need to change the ...
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2 votes
1 answer
650 views

How to use set-user-ID bit on directories?

I want all files in directory /home/alex/foo to be owned by alex, no matter who creates them. I'm trying this technique, but it doesn't work (on CentOS 5, under root): $ cd /home/alex $ mkdir foo $ ...
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root directory permissions changed to 777 by mistake whats now? [duplicate]

By Mistake on Ubuntu 9.04 my colleague has changed the permissions to 777 on root directory (/) whats the best way to recover the permissions ?
necromancer's user avatar
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2 answers
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centos , linux , apache permission issue

I have a php file which executes a shell script $ip_access = $_GET['ip_access']; // run knock app exec("/home/knock.sh ".$ip_access); however when I access it I receive the following error in the ...
Michael 's user avatar
4 votes
3 answers
7k views

Conflicts between ACLs and umask

I have a directory which can be read and written by a couple of unix groups. This is achieved by using ACLs. Let's assume I did it like this: mkdir /tmp/test setfacl -d -m g:group1:rwx /tmp/test ...
kayahr's user avatar
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What is the purpose of executable file access rights in Linux?

I never understood this, because if you have access to read a file, doesn't that mean you would be able to copy it somewhere else, thus allowing you to execute it anyway? What am I missing?
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Linux - What s means in the permissions mask of a file?

If I run ll /usr/bin/crontab it gives me this output: -rwsr-sr-x 1 root root 315432 Nov 10 2007 /usr/bin/crontab What does 's' means in the permission mask? Why do they need to use that? ...
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OSX: Undoing CHMOD

I've seen how to do this on linux, however is there a way to do it in OSX? I've accidentally ran chmod -R 777 / Looking for how to undo this. Thank you
Petrogad's user avatar
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CMOD 755 is not possible

If CMOD 755 is not possible and 767 is not either, what is the next best permission? So far I have checked 775 and it works, but is it safe? It is an upload directory and the only people uploading to ...
CruisinCosmo's user avatar
3 votes
1 answer
2k views

How do you give full access w/ chmod to multiple groups? Need to use ACL's?

First of all, thanks for reading. I've had success running a plist launchd job that is in my LaunchAgents folder. It basically calls a small shell script that chmod's a folder's permissions. I then ...
gabemartinez's user avatar
1 vote
1 answer
1k views

Default owner of new files and directories?

How does one configure an Ubuntu 10.10 system to behave like this: User creates a new directory or file. User is the default owner of this file. The file's (or directory's) permissions default to ...
bitcycle's user avatar
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16 votes
4 answers
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How do I copy ACLs on Mac OS X?

Most unix derivates can copy ACLs from one file to another with: getfacl filename1 | setfacl -f - filename2 Unfortunately Mac OS X does not have the getfacl and setfacl commands, as they have rolled ...
MagerValp's user avatar
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1 answer
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Undoing chmod 777

Sometimes in desperation, to test if my problem is not the permission problem I do: sudo chmod -R 777 mydir/ In most cases it does not helps, and now I have two problems ;) Files inside mydir/ had ...
takeshin's user avatar
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1 vote
2 answers
532 views

Should I set permissions to 777 for setup and config file?

I am writing a large PHP application (with setup) for the first time and am wondering about the security precautions I should take for permissions. setup.php uses uses fopen/fwrite to generate a ...
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4 votes
2 answers
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Is chmod 700 on a directory sufficient to prevent arbitrary access to subdirectories?

If I chmod 700 the the home directory of a user (on Linux), does this guarantee that other non-privileged users cannot access any subdirectory or file under that home directory? Or are there sneaky ...
recampbell's user avatar
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4 answers
4k views

How to delete folder of owner/group 99 99

I am using wordpress with wp-super-cache plugin. This plugin automatically created a cache folder in my site for storing the cached files. But unusually it created folder with owner/group 99 99. It ...
Aakash Chakravarthy's user avatar
55 votes
1 answer
45k views

What does the @ symbol mean in a file's permission settings?

I'm on MacOSX, I did ln -s on a directory and these are the results: -rwxrwxr-x@ 1 shiki admin 970332 Mar 6 16:38 apc.so -rwxrwxr-x@ 1 shiki admin 653884 Mar 6 16:38 eaccelerator.so -rw-rw-r--...
Shiki's user avatar
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1 answer
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Can't read directory owned by my group

I moved the postgres data directory to a separate partition and it works great. The directory is owned by postgres user and postgres group. d-wx------ 11 postgres postgres 4.0K 2010-06-11 08:28 data/...
Jonathan's user avatar
0 votes
1 answer
386 views

Issues with chmod resetting on Ubuntu after ftp upload

Whenever I overwrite a file using FTP, the chmod of the file gets reset to 600. What can I do prevent this? I'd like to just set the chmod for the entire directory and never have it change.
mike's user avatar
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4 votes
2 answers
325 views

Accidential CHMOD 755

Alright, I accidentially chomdded everything to 755, which isn't as terrible as chowning everything to the local user. How insecure is this and how would I restore it easily, without reinstalling?
Nik's user avatar
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1 answer
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Is CHMOD 775 safe to use?

I know it's not good to use CHMOD 777, but is 775 as dangerous? Does it provide a backdoor to hackers as easily as 777?
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4 votes
3 answers
30k views

chmod -R 777 / on ubuntu - numerous problems

A client has accidentally given the entire filesystem full permissions on their ubuntu 10.04 box. chmod -R 777 httpdocs/cd / As you can see they attempted to cd to the root, and instead gave chmod a ...
ncatnow's user avatar
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2 answers
660 views

Locked out by changing file permissions

I just locked my root account (and all other accounts if it matters) completely out of the RHEL 5.4 by changing permissions on every file to 400. Now I have "Permission denied" on any command that I ...
user avatar
0 votes
1 answer
941 views

Permission settings for apache2 web content directories with several users?

I've got a Debian VPS set up with a LAMP-stack. My apache2 instance runs on the user account 'www-data'. In addition to the root account and the service accounts I have several user accounts ...
John's user avatar
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11 votes
3 answers
17k views

How to allow members of a group to change file permissions on linux

I need to allow members of the group 'ftpusers' to be able to change permissions on all objects inside a certain directory. I was looking into how to do it but all I have found is how to do it on BSD: ...
Drasko's user avatar
  • 135
4 votes
3 answers
28k views

CHMOD To Prevent Deletion Of File Directory

I have some hosting on a Linux server and I have a few folders that I don't ever want to delete. There are sub folders within these that I do want to delete. How do I set the CHMOD permissions on the ...
Fenton's user avatar
  • 244
76 votes
7 answers
148k views

How to setup linux permissions for the WWW folder?

Updated Summary The /var/www directory is owned by root:root which means that no one can use it and it's entirely useless. Since we all want a web server that actually works (and no-one should be ...
Xeoncross's user avatar
  • 4,539
2 votes
1 answer
2k views

CentOS 5.4 NFS v4 client file permissions differ from original files & NFS Share file contents

Having a strange problem with NFS share and file permissions on the 1 out of the 2 NFS clients, web1 has file permissions issues but web2 is fine. web1 and web2 are load balanced web servers. So ...
p4guru's user avatar
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5 votes
3 answers
11k views

Apache "No Permission" - 403 forbidden

I've accidentally performed a wrong chown update this morning and now my /var/www permissions are all wrong. I'm unable to access anything anymore, apache will always say I do not have permission to ...
Jelle De Loecker's user avatar
4 votes
2 answers
11k views

what chmod and owner:group settings are best for a web application?

we are configuring a PHP web application on CentOS and have all our files currently in /var/www/html/project/ Apache is configured to run as apache:apache and has access to the directory above. Right ...
solsol's user avatar
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1 answer
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Mixed ftp ssh permission problem

I'm running a webserver and I've setup two groups. One with just me, and another with me and a collaborator. I've chmodded to 755 my htdocs folder and I gave a specifically "upload" dir the group ...
user avatar
17 votes
5 answers
14k views

CHMOD - Applying Different Permissions For Files vs. Directories

I've been trying to clean up permissions on a few boxes and have been scouring the chmod man as well as all the internet documentation that I an handle without any luck -- so here we go. Basically, I'...
Skone's user avatar
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4 votes
1 answer
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Permission Hierarchy possible in OpenSolaris + ZFS + ACLs?

I've been doing some research into OpenSolaris and ZFS for use in a NAS. Thus far I have created the following: /tank/projects /tank/storage /tank/developer /tank/sandbox The ...
Leah Calum's user avatar
1 vote
6 answers
7k views

How to change permissions on folders, but not files?

Is there a concise linux command (that will work on OSX) to change permissions on folders and all of their contents, but leave files in the current directory untouched? For example: /parent/...
Michael Prescott's user avatar
2 votes
4 answers
385 views

Why do many linux files have others=read access?

Can I run chmod o=- -R / ? I don't want a newly created user to be able to cat /etc/passwd, just because of its default permissions. And I want to understand why these defaults were chosen for ...
Devrim's user avatar
  • 1,187
0 votes
1 answer
2k views

Windows File Permissions - Comparing to chmod

I am using an SAP specific tool (like Winzip) called SAPCAR to compress and decompress files into archives. I have a file from SAP called KA71007.SAR When I view the contents of this archive it ...
Techboy's user avatar
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12 votes
9 answers
158k views

Is there a way to run chmod on Windows

Is there a way to run the chmod command on Windows?
Techboy's user avatar
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4 votes
4 answers
2k views

How to restore remote access to a RHEL system from expanded permissions set over the entire filesystem? [duplicate]

Cause of the problem I intended to add group write permission on hidden files like '.hgignore' with the following: # pwd /opt # sudo chmod -R g+w .* The problem is that '..' matched this pattern, ...
Joshua Berry's user avatar
3 votes
9 answers
28k views

What CHMOD settings to keep users from viewing directory?

I have an "includes" directory that my web server should be able to fully interact with, but I don't want users to be able to see its contents.

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