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

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Why am I still able to write to a directory after I have changed permissions at the terminal?

I am running Mac Os 10.9 and connecting to a Mac OS server (10.8?) over our local network where I have an admin account. I regularly sync 3 directories from my machine to the fileserver using rsync. ...
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415 views

Force file and sub-directory permissions on OS X server

We have an OS X development server at work for five developers, creating mainly Symfony2 based websites. Out of the five only two of us are in the sudo group, meaning if the others had issues with ...
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35 views

OpenVPN CA Certificate creation error

When doing ./build-ca I'm getting a weird error and I cant find any information about it, been stuck with this error for hours. I'm doing it as SU and SUDO and neither work. This is the error I'm ...
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4answers
124 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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1answer
337 views

OSX how to chmod a mounted AFP folder from NAS

I have mounted a drive from my DLINK DNS 320 Nas onto my Mac Mini 10.9 via AFP. One of the subfolders where I usually store photos (named '2013') is currently showing restricted access permissions, ...
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154 views

Permissions of files/directories in Unix

It appears that each file/directory has a given set of permissions shown by the 10 characters to the far left of each listing if one were to type into the terminal ls -l Considering that you can ...
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1answer
172 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
797 views

Changing permissions (read-only) for specific user for specific folder and sub-folders/files in RedHat?

Question is about user permissions in RedHat. How to give read-only permission to specific user just to read a specific folder and its sub-folders and files? How can I do it? I've tried: chmod a+r ...
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2answers
169 views

What is this hidden directory doing on my Desktop?

On my Mac I just encountered a hidden directory on my desktop. I don't recall putting it there. When I type ls -la in Terminal on the desktop I get the following: The last folder is what triggered ...
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1answer
762 views

Permission denied altough chmod 777

I am running following commands: $ ls total 12K drwxrwxrwx 3 szr szr 2.0K Nov 14 12:08 . drwxrwxrwx 12 szr szr 2.0K Nov 14 11:23 .. -rwxrwxrwx 1 szr szr 1.6K Nov 14 12:08 config.xml -rwxrwxrwx 1 ...
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2answers
311 views

Restrict user access to only read from /proc

As a method for setting up some bare-bones systems monitoring, I have a script set up to SSH in, and run some basic shell commands, reading some files in /proc. I would like to create a specific user ...
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209 views

Linux directory permission inheritance for new files created

ive following folder drwxr-xr-x 7 root root 45056 Nov 25 12:39 data which include sub dirs and files its all 755 , but when i create new file inside these dir its get permission -rw-r--r-- 1 ...
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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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1answer
52 views

simple priveleges/chmod setup doesn't work

here is the directory listing: drwxrwSr--. 31 storage storage 4096 Nov 20 23:12 storage id returns uid=501(peter) gid=501(peter) groups=501(peter),504(office),505(www),506(storage),507(media) ...
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1answer
452 views

Unable to change access permissions on external ntfs Harddrive

I am fairly new with Linux when it comes to mounting hard drives, so hopefully this is a simple question. I recently purchased a 3TB hard drive that would have read/write access with both Mac and ...
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1answer
105 views

CentOS: How to prevent a user from executing an application installed in a specific directory

I have an application installed in /etc/mydir. I have executed the following to remove the ability for users to execute this program. chown root:group1 /etc/mydir -R chmod 700 /etc/mydir -R I ...
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1answer
129 views

Why in Midnight Commander the chmod has 5 digits and what for?

In the file menu if I go to chmod, it returnes the chmod value for the folder / file. I understand the last 3 digits, the second is setuid/setgid/sticky bit (have read the docs on it but its use is ...
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2answers
2k views

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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630 views

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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What should I do to secure, chmodly wise, my server?

I want to let my friend access my server so he can host his website. Let's call him Joris. # useradd joris note that I'm Debian. So now a /home/joris has been created. This is cool and all. BUT. He ...
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2answers
585 views

Add read permissions to all the directories of a path

I want to add (not modify other file permissions) for all the directories in the path written bellow. Something like chmod -R xx4 /home/mDB/admin/KNUCKLES/dbs/ The path /home/mDB/admin/KNUCKLES/dbs/ ...
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740 views

How should chmod and chown be used together?

I recently sold my mac, and before doing so I put its files on an external HDD. Now I'm using Linux to move those files to a larger HDD, but some folders still retained some residual mac permissions, ...
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1answer
125 views

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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180 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 ...
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392 views

Changing access rights of the specific folder for specifeid user

what is the exact analog of the following two commands in linux # chmod -R +a "www-data allow read,delete,write,append,file_inherit,directory_inherit" /path/to/moodledata $ sudo chmod -R ...
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781 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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3k views

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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104 views

Can chmod 777 ubituitously replace the need for chown ?

Its clear to me that the chmod 777 command will make any file, theoretically, accessible/readable/writeable/executable/ by any user. But are there instances where, even with a world ...
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3answers
2k views

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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2answers
419 views

Clone permissions for all files in a folder [duplicate]

I have a question. So I have 2 folders, both of which have the same files in them, but some with different content, but the same names. What I want to do is clone all of the file permissions from one ...
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Chmod not working on /var/www/

I am running an Ubuntu 11.10 x86 VPS. I have given a user sudo privileges, and for some reason I cannot recursively chmod /var/www/. I am running Nginx with php-fpm, although that shouldn't matter. ...
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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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92 views

What will * in bash do?

My question is quite simple, if I am to enter these two line in OS X Terminal, what should happen? xupengjunde-iMac:Shane Shane$ cd /Volumes/External xupengjunde-iMac:External Shane$ sudo chmod -RN * ...
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749 views

chmod +x not working in Cygwin

I am having issues getting cygwin to accept the chmod command: JonP@price8560p /cygdrive/c/C2dev/Git/c2/bin/ffmpeg $ chmod -v +x ffmpeg mode of `ffmpeg' changed from 0644 (rw-r--r--) to 0755 ...
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Take control of all disks/filesystems automatically in linux (Kali)

I have two mac disks plugged into my Linux Kali and for the life of me I cannot get ownership of them. (LaCie) I don't have this problem in Windows or Mac, I just copy the files. Drag and drop. But ...
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4k views

cannot create directory. permission denied. but i have permission

i'm fairly new to linux, and ran ubuntu the other day. it is running dual boot with windwos 8. now, the problem is, even though i log in as root and give a specific folder ALL PERMISSIONS (#chmod 777 ...
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33 views

how to display I/O file on shell

I am writing shell script and I need to display my output at the same time however it doesn't work with 2> somefile.txt and if I do | tee -a somefilel it will not overwrite which I need to . <> ...
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780 views

Can't change folder permissions on FAT32 partition-Mac OSX

In have an external hard drive which has two partitions: Mac OSX Extended Journaled MS-DOS FAT Basically if I select get info for any file/folder on the FAT partition, there is no option to change ...
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2answers
1k views

Previous version of CGAL with Macports: “Error: Unable to execute port: Could not open file”

I'm trying to install a previous port of cgal with macports. I'm following this How-to: http://trac.macports.org/wiki/howto/InstallingOlderPort I already read this answer but it didn't solve for me. ...
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284 views

group permissions for scp

We have a server running as a firebird user. We want to scp files to the server that are need by firebird but copied as another user: it-test. What is the best way to set that up on the ...
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0answers
678 views

How do I set the default permission of 775 for all new files and directories in server?

I'm trying to set the permission of any new files to 775 by default (inherited from parent folder), so that every user group can edit these files. I have found and followed this tutorial with no ...
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3answers
4k views

whats the difference between chmod 777 and chmod 7777

I have a professor who insists on always typing chmod 7777, but I was taught that chmod 777 was the proper convention. I tried them out on the command line and chmod 777 something.txt yeilds ...
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chmod: .: Permission denied & sudo chmod -R -rwx

I accidentally executed the following command in an important dir without knowing what the command does. Now I'm getting permission denied and not able to open the dir. sudo chmod -R -rwx . Please ...
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2answers
254 views

What unix permissions do I need?

I have a directory that hangs off root: /data/my/folder/here/ and /data/my/folder/herealso/ I wish all users to be able to write files to the here and herealso directories. But limit (as much as ...
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375 views

Windows attrib command changes file timestamp

I have some batch file running that does the following on a directory tree with several thousand files: change file attributes, turn OFF readonly do some stuff, add new files. change file ...
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chmod symbolic notation: unexpected “=” operation behavior

I am reading The Linux Command Line by William Shotts and I read somewhere in the book a part regarding permissions which says The operation may be a “+” indicating that a permission is to be added, a ...
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changing the ownership of a file in linux

I have a file "test" on an Ubuntu system owned by the root. The ls -l option is shown below. $ ls -l test -r--r----- 1 root abacus 373 Nov 12 19:19 test I know that only the owner of a file can ...
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1answer
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Recursive write permissions on files and folders: Prestashop installation

I am trying to install Prestashop in my Linux machine. But it says Recursive write permissions on files and folders: ~/config/ ~/cache/ ~/log/ ~/img/ ~/mails/ ~/modules/ ~/themes/default/lang/ ...
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1answer
596 views

How to use chmod to change a file's permission?

I used ls -l to find file permissions in a shell and found this: File 1: -rw-r--r-- 1 root root 451 Mar 9 15:25 file.class.php File 2: -rw-rw-r-- 1 andy dev 872 Mar 9 15:43 file.class.php I want ...
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7answers
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“chown -R root /” how screwed am I?

I accidentally performed the command chown -R root / while trying to change the permissions to the public folder of my rails app. I believed this changed the permissions to all my folders on the / ...