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

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after trying to modify permissions I can no longer access localhost

I was getting sick of having to sudo every command in my web development folder (/var/www) so I tried to change the permissions to 777. The function seemingly worked (that is, gave no error), although ...
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66 views

Shell Command that Combines chmod and chgrp

Is there a combined variant for chmod and chgrp that sets both user and groups permissions in one single system call for each file? This is useful for increasing performance on slow data layers such ...
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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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779 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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601 views

Changed the mode of /var on debian

I ran chmod 777 recursively on /var/ and could no longer connect via SSH. I read that chmod 600 would fix it. I was able to connect after doing it but this was a bad idea. Is there anyway I can find ...
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269 views

Chmod, Groups, and Users

So I've tried looking this up but I've not found similar examples (please feel free to refer to them if your Google skills are better than mine). What I'm trying to do is as follows: I am hosting a ...
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2k views

Ubuntu Cannot change permissions on files I own and have RW to

I have a harddrive full of backups which for me is mounted at /media/chronus_ I have been trying to give another user rw permission to this drive. The problem is that I cannot change any permissions ...
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36 views

Prevent deletion of folder but let access to everything inside of it

I know there is the +i flag for files and directories, but i have a deeper Problem. Is there a way to prevent a folder from being deleted by an User which should be able to create / access / remove ...
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428 views

How to correctly set writable the /var/www/ directory of an Ubuntu Linux system?

I am a software developer so I am not so into operating system configuration details and I have the following problem. I have installed a LAMP environment of an Ubuntu Linux system dedicated to the ...
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250 views

chown not working on ext4 hard drive

I have a new 3TB internal hard drive and after writing some data to it I completely zero'd the drive using DD. I then created a partition table (GPT) in Gparted and created an ext4 partition. All went ...
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69 views

How can I skip mounted directories with chmod?

chown supports a -x option to ignore file system mount points. Is there an equivalent for chmod?
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637 views

I broke SSH by using chmod on an EC2 Instance — How do I correct?

I have been running an Amazon EC2 Instance for a while, and recently accidentally changed permissions/ownership on folders recursively. I can no longer SSH into the instance. I do not recall what the ...
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56 views

Granting full rights on all files (owned by su) within certain directory

I got some trouble with a server situation, where i keep some configuration files in a sub-directory of a web project. Using my superuser account, i make changes to these files, which NetBeans commits ...
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733 views

CentOS $chmod a+w /etc/sudoers command not found

I am very new to CentOS and I am trying to edit my sudoers file. First I am told to run the following: $chmod a+w /etc/sudoers and right away I hit an error: bash: a+w: command not found What ...
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220 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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127 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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5k 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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168 views

Shared hosting, stop user deleting .html file?

Hi guys I have set up a small shared hosting set up for friends. I have set the file chmod permissions to chmod 711 /home chmod 711 /home/testuser chmod 755 /home/testuser/public_html chmod o+r ...
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493 views

What do these chmod parameters mean?

What changes are being applied by u+s,o-rwx in the below? chmod u+s,o-rwx myUserGroup myFile
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1k views

Chmod 644 on /etc/ any way to fix?

I tried to tab complete something and I guess it wasnt there. I know you are not supposed to set the permissions to /etc/ like that, but my permissions seem to be all messed up. whoami prints out ...
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419 views

Why is group write permission ignored in Ubuntu?

I want my user to have full access to the local Apache root folder, and I also want the Apache user to have full access to the same folder. What I did was create a new group called DevGroup and I ...
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279 views

what do these permissions mean?

I did chmod on some files in Mac 10.7.3 and I accidentally entered the code 7744 instead of 744. The resulting permissions were: -rwsr-Sr-T After seeing this I reran chmod and fixed the ...
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Group permissions for apache

I've run into a problem with Joomla. . . it cant create new folders through the Admin UI. It's a standard permissions error. I've been told to chmod all of the folders in the site to 777. Is ...
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207 views

How do I give an admin user full rights to all home folders?

What is a good permission scheme for this scenario? user administrator (from administrator group) has full access (read/write/execute) to /home folder any other user (from users group, example: ...
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chmod on /System/Library/ in Mac Snow Leopard - Now Cannot Open Terminal

I was trying to run a command to fix a different issue, but when I cut and pasted the string there was a space in it and this is what was run: sudo chmod 000 /System/Library/ Now when I try to open ...
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551 views

CentOS chmod overiding set-group-ID?

I'm used to setting up SGID on a directory chmod -R g+s example and then chmdo -R 750 example And have the directory and all sub-directories preserve the set-group-ID. On CentOS SGID gets ...
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108 views

changed directory permissions of

So, I was changing some file permissions using gFTP, and somehow I managed to set the permissions of .. (idk how, last time I use gFTP) The problem is I was working in the highest directory I could ...
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37 views

Linux chmod: How to allow access to a folder and its subfolders/files

How can I do "chmod 704" to a folder which I want it to allow others to access and download the entire folder including its sub-folders and files? Thanks, Baha
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105 views

Confirmation prompt for chmod, chown

I'm just trying to add a confirmation prompt to a few linux commands like chmod and chown. I've tried to google this but I can't find much information on the topic. While searching I found out ...
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used chmod wrongly to mess up copy rights. How to correct

I ran a chmod command like chmod 644 dir/* It seems to have worked for files in this directory, but files in all other sub-directories are now in some limbo state. ls -l dir/sub-dir shows: ...
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14 views

tree will not descend into directories

I just unpacked a tar file with a folder in it. I did a tree -F and saw asterisks popping everywhere. All of the files (even png, txt, etc) were marked as executable. So I did what any sensible human ...
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214 views

Is it possible to disable chmod/chown from sudoers for these specific directories /usr and /etc?

There has been two occasions where I have accidentally chmod-ized 777 the whole direcotry of /etc and it has forced me to come to the decision that I'd be better off to do fresh installation of OS ...
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27 views

Under what circumstances can I not make a file world readble on linux

I'm trying to set some files world readable sudo chmod 664 *.ogg however the files still have permission -rw-rw---- after the operation. These are phone calls recorded from Asterisk - if that ...
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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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28 views

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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922 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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35 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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346 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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2k views

How to open a file with write access on OSX terminal?

I am trying to open private/etc/php.ini.default file to add detect_unicode = Off. But after opening above file with this command vim php.ini.default, it only opens this file as readonly. How can I ...
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569 views

Change owner of file without being root

I suggest that I have a log file with 666 permission and its owner is alice. So user 'bob' can change its owner by this: cp log log.temp; rm log; mv log.temp log So how can I fix this risk?
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154 views

Does “chmod -R 700 directory_1” update directories pointed by softlinks?

Does "chmod -R 700 directory_1" update directories under softlinks? Forexample, there is a softlink under directory_1 folder: "my_softlink". And my_softlink points to a directory_2. Will permissions ...
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333 views

Give the www user chmod permissions

Ive got a website (run on Ubuntu Server) that needs to modify and delete files, every now and again it comes across a file that it needs to run "chmod" on in order to perform it's operations. However ...
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984 views

No permission for ls drwx--x--x

Is there any way to see a tree of directories with a chmod of drwx--x--x ? I know I can manually check by bash script with if [ -d dirname ]. However it is not the solution I am looking for. Cheers!
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185 views

linux chmod causing crash

I needed to give write permission to file representing GPIO pins,out of curiosity i taught changing permissions of all files/folders,by mistake instead of doing chmod 755 * in the root I did chmod ...
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665 views

Server error 500 due to file permission

I just installed apache/php5 on ubuntu.When trying to access folders in localhost (via the browser) i got a permission denied page.I tryed to chmod for the files to 755 -R and now i got a 500 ...
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80 views

How to do an ls as if you were in the group 'other'?

In a linux system, I've done a chmod o+r -R mydir/ and I want to check that users in the 'o' group are able to read the contents of mydir. How can I do an 'ls mydir' as if I were a user in the other ...
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535 views

a graphic utility in windows to change folder/file permissions like chmod in linux

i want to make a folder available for upload to users. i have to make this folder as 777 file permissions Is there any graphic based software to accomplish this task ?
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27 views

Homedir inside homedir restricted access

On my VPS i've installed debian, apache+php. I have 2 users: foo and bar. Apache is configured to execute php files from /home/foo/htdocs. I created dir: /home/foo/htdocs/bar/ and made it home ...
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2k views

Can't change owner/group to root:wheel on certain stubborn files

SOLVED: Turns out at one point while trying to copy files over to the thumb drive it must not have been mounted by OS X, and since I was root, it made the same mount point directory and copied into ...
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4k views

Samba shared folder and permissions (CentOS 5.5)

I have set up a samba shared folder /shared I have created 2 users Jack and Jill, and they are part of the Developers group. Developers have read write and execute permissions on the /shared ...