chmod (short for change mode) is a Linux / Unix command used to change permissions of files and directories.

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What does `chmod u+s directory` do?

chmod g+s directory makes new files inherit the group of the directory. I thought that chmod u+s directory would make them inherit the directory owner, but they don't and I see no other effect.
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Restoring lost group permissions on mac

Using mac's terrible file sharing prefs, I managed to goof up permissions on my Documents directory. My non-Documents directories have permissions like this: drwx------+ for . drwxr-xr-x+ for .. -rw-...
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Do I have to chmod after ln -s?

After I create a symlink with 'ln -s' (in Ubuntu 12.04, as root), it seems to be created with 777 permissions. Is that normal? Should I always do 'chmod 644' after doing 'ln -s'?
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1answer
319 views

How to chmod in Nautilus via keyboard?

I like to use the mouse as little as possible, but I find Nautilus useful enough to use it when browsing for files. If I want to rename a file while in Nautilus I can hit the F2 key; is there a way I ...
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Debian broken filesystem by chmod -R 0774 /

An user made the chmod -R 0774 / command. When i execute the su command i get: "it was not possible to define groups". If i try to ssh from the root i get: /bin/bash permission denied the ...
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1answer
719 views

chmod always unsets setgid bit on directories if I'm not in a group

Here's the scenario: I'm using Ubuntu Linux (12.10, if it matters), and I've got a directory whose permissions are thus: drwxrws--- paul www-data myfolder/ You can see the setgid bit is set. If ...
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1answer
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Permanently changing permission of FireWire device

I just setup a FireWire audio interface. Everything works fine, except for I need rw-rw-rw- permissions on /dev/fw0. I can always sudo chmod 666 /dev/fw0 just before setting the thing up, but then it ...
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chmod: Set files to different permissions from directories

Is there away that I can run chmod to set the folders at 0755 and the files at 0644, or do I have to apply 0755 to all folders individually?
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I don't fully understand CHMOD file permissions, can anyone better explain it?

I've searched the internet for some time for a good explanation of CHMOD, but have yet to come by a good explanation, since every explanation uses the same words with small variations. What I know so ...
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1answer
1k views

chmod does not change file permissions

I am trying to create an executable "Hello World" ruby file and I copied an existing, working executable "Hello World" ruby file and renamed it, but the new file does not have any executable ...
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3answers
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What does the 3 mean in drwxrwsr-x 3

I'm following directions on configuring Dovecot MDA and the instructions are telling me that /var/mail should have the following permissions: drwxrwsr-x 2 root mail When I ran ls -ld /var/mail the ...
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3answers
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Deleting a chmod 0 file without superuser rights?

A PHP script accidentially changed the right flags (chmod) of a directory to 0. (No access to anybody, including owner). If I have no root access to this server, is it possible to delete the file ...
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chmod 700 -R ~ - is it safe?

I'm thinking of doing 'chmod 700 -R ~'. Can it be dangerous? What can happen what I don't expect? Also, is there any way to keep all files on $HOME to be -rwx------?
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1answer
2k views

Automatically chmod a file when doing git add?

I have an ubuntu development system using git to manage files, but I like to do my editing in QTCreator on a different (windows) system, so I have a windows network drive mapped to the ubuntu server. ...
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3answers
367 views

Does permission 777 allow scripts outside your server to write on it?

Let's say example1.com is located in US, and example2.com is located in EU. example1.com/folder/ has 777 permission. Will a script in example2.com be able to write on example1.com/folder/? Or is ...
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1answer
264 views

Weird chmod parameter - “!$”

I found on an article a line that was saying: Now execute -> sudo chmod 700 !$ What does !$ in that case?
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205 views

Always create files/folders but only write to those the user owns

I need 2 Linux users to share a folder. Within this folder, users should always be able to create files and sub-folders and write into any sub-folder (whether they own it or not). However, they should ...
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3answers
689 views

In GNU/Linux, how to restrict deletion of files and directories owned by a user to a super user only?

In GNU/Linux, how can directories be set such that the owner can only add/read files/directories to/from them but only a super user can do any deletion in that structure? Consider this scenario: You ...
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1answer
112 views

UNIX: Just been hacked.. any steps to securing files and directories?

I used command to delete all files modified within last day. But is there a command that can go through all PHP files and all directories and modify them back to standard permissions that's safe for ...
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2answers
636 views

linux permissions on folders

AFAIK when i have r-- it means i can read the directory but not CD into it (according to the book). IIRC i can drop files in when i have -w- access. So why cant i copy files (i understand why i cant ...
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2answers
518 views

Error writing to USB mounted on Raspberry Pi

I have a Raspberry Pi which I recently bought, and am planning to use it as a torrent box. While setting it up (over SSH) I tried to mount a 8GB SanDisk USB Drive I had connected to it earlier. ...
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2answers
3k views

Restore default permissions to “/var” to CentOS installation

So I accidentally ran chmod -R 0777 /var and I need to revert that (let alone allow chmod the correct ssh directory so I can log back into it). I'm feeling screwed, can anyone help? The sooner the ...
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1answer
507 views

How can I mirror a Linux directory and back up all metadata?

I need to backup my home folder (and a few other folders) on an organizational Linux NFS system where my account will be expiring soon, onto a personal hard drive (which is not using a Linux ...
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1answer
5k views

User Permissions: Daemon and User

I often run into this issue on Linux, and I'd love to know the proper way of solving it. Say I have a daemon running. In my example, I'll use LigHTTPD, a webserver. Some software, like Wordpress, ...
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4answers
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File still unwriteable in /var/www/html after the chmod command

I've got some trouble while trying to install some applications on my linux system. It is said that the files in my /var/www/html/xxx directory, where I put them, is not writeable. The command chmod ...
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1answer
364 views

How to delete file with no write permissions for any user?

I find myself in a strange situation where a script wrote files with the following permissions: -r-------- 1 user1 user1 file1 Dec 24 14:53 -r-------- 1 user1 user1 file2 Dec 24 14:54 -r-------- 1 ...
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1answer
387 views

Unable to create files in a directory

I have created a directory in Virutalbox. Using VBoxManage, I am executing a script inside the Ubuntu VM directory I created above from Ubuntu host OS. But if the script in the VM contains commands ...
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1answer
855 views

What is the equivalent of umask in Finder?

It is not entirely a problem with Finder. It happens system-wise. Whenever I create a file in osx, the permission is always set to owner read/write and the rest read only -rw-r--r-- 1 me mygroup ...
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Windows equivalent of the Linux command “chmod”? [duplicate]

Possible Duplicate: Program to change file permissions in windows What can I use to set/change permissions on a Windows folder than not the Windows-based solution? There is an equivalent ...
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Cannot change permissions in symlinked dropbox directory in Ubuntu 10.10

Title pretty much says it all, but here's what I'm doing... ls -l produces this... drwx------ 1 brian brian 4096 2010-12-28 14:19 foldername -rw------- 1 brian brian 0 2010-12-28 15:54 index.html ...
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3answers
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Linux directory access question

I have a linux system with apache installed and i store web files in /home/username/www/sitename/htdocs. For this to work my /home/username has read and execute permissions for everyone. I know it's ...
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Question on chmod in UNIX

What does chmod 654 stand for ?
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chmod: removing “x” permission recursively totally borks the permissions

I have a folder with some contents (three files and a folder) that look like this: -rwxr-xr-x 1 max max 14504 2011-05-31 16:55 main.css -rwxr-xr-x 1 max max 2504 2011-05-31 16:55 reset.css -rwxr-xr-...
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2answers
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description for command : chmod 777

I encountered an option for chmod: chmod 777 /tyr/.... What is 777 for?
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4answers
132 views

Is there any harm in converting all files to executable?

I wanted to install certain software. The package had lots of files including some shell scripting files. Initially I had to select some files and then make it executable: chmod 777 shellscr1 but ...
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3answers
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Can I use `chmod` to change the permission from -rwsr-xr-x to -rwsr-sr-x?

Can I use chmod to change the permission from -rwsr-xr-x to -rwsr-sr-x?
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Give execution permission to directories but not to files

I have a directory structure with files and directories and I like to assign permissions so all the files and directories have read-write permissions for the user and read permissions for the group ...
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1answer
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Are rights 7110 equivalent to --S--S--s?

Are rights 7110 equivalent to --S--S--s? I mean the rights for Unix' chmod command.
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chmod 777 no effects on Linux Mint

I'm trying to assign run privileges to a file named foobar using: sudo chmod 777 foobar However nothing happens. The file is located on a NTFS mounted partition. The mount command says: /dev/sda4 ...
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How to chmod +x a file in Windows, for use in Linux?

I have a file that needs to be executable in Linux, which I'd do by using chmod +x when using Linux. My problem is: this file is compiled in Windows, and it's a pain to have to open my Ubuntu VM to ...
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1answer
943 views

chmod: I own the folders, but I can only delete the folder, not the files inside it

Hello I new to linux and i have searched about 10 hours for a answer without success. I have created a folder called "Datatank" and chmod 777 Datatank All files and folder inside Datatank can I ...
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sftp chmod recursive

I have logged into a server via sftp via terminal. When I run the command chmod -R 755 ./* I get the error You must supply a numeric argument to the chmod command.. How do I apply a recursive ...
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1answer
244 views

Search for chmod 777 in terminal

I'm working with a system where a few files and maps seem to have permission 777. I want to change them to a more secure chmod, but I don't have a list of all the 777-files. I could do a terminal ...
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1k views

Parameters to be used with chmod?

How to use CHMOD in linux? When I try to delete a file/folder, permission is denied. What exact params must I give for chmod here? This is what I need to do. Execute a command ./build.mips , but I ...
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3answers
428 views

cygwin's chmod behaves as working, but it does not work

My Cygwin installation is behaving strangely: chmod does not work. [09:45 Administrator@DellIns14 ~] > ls -ls /usr/bin/chmod 64K -rwxr-xr-x 1 Administrator None 38K Feb 6 2012 /usr/bin/chmod [...
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1answer
320 views

Disabling chmod for some users

In Linux system, assume that there is user 'A' (non-root user who has ssh login permission). 'A' owns an executable file "A.out". I want to allow 'A' to read/execute "A.out" However, I don't want '...
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Why does 'cd' not work on an entry with 'directory' attribute?

My OS is fedora 20. I act as a root user. under / directory, I input: #ll ... d????????? ? ? ? ? mnt ... #cd mnt bash: cd: mnt: Not a directory #chmod 777 mnt chmod: cannot access 'mnt': No such ...
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What does the command “chmod a=w g+x alpha” do?

I was asked this question but didn't know what it does. I know chmod and its usages but what does this exactly do ?
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Changing chmod flags back

I'm fairly new to the whole UNIX / command shell sort of stuff, so I apologize for any ignorance for something I am not aware of. And by new, I mean extremely new. I was confused by how to change a ...
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2answers
186 views

Convert ls -ld to chmod/chown commands

X home dir permissions: drwxr-xr-x Y home dir permissions: drwxr-x--x So my question is, how can i convert drwxr-x--x to a chmod/chown command so I can put the same permissions that Y has on his home ...