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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1answer
25 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?
0
votes
3answers
546 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 ...
-1
votes
1answer
28 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
15
votes
4answers
2k views

What does a 'd' stand for in UNIX file permissions [duplicate]

I've never really got how chmod worked up until today. I followed a tutorial that explained that youve got three different permission groups: owner (u) group (g) everyone (o) I've also learned ...
-2
votes
2answers
48 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
492 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
42 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
108 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
22 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
35 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
4answers
65 views

'chmod g+s' command

Hello I want to understand the role of the chmod g+s command in Unix. I also would like to know what it does in this particular context: cd /home/canard; touch un; chgrp canard .; chmod g+s .; touch ...
109
votes
8answers
9k views

How to chmod without /usr/bin/chmod?

Today I was told a tale by a Unix trainer, a tale where the root password got leaked to the students, and one of the fellas removed the execute permission from /usr/bin/chmod itself. How do you ...
1
vote
1answer
56 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
28 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
41 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
11 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
83 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
48 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 ...
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votes
2answers
30 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 ...
1
vote
1answer
48 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 ...
2
votes
2answers
120 views

assigning read/write privileges for a folder to a user in CentOS 7

I am logged into a CentOS 7 server as root. I created a folder /somefolder. I want someusername to be able to write to that folder via scp from a remote computer. What command should I run so that ...
1
vote
0answers
29 views

tracking directory permission changes

Permission of a certain directory named 11203 got changed twice bcoz of which the hosted app encountered some problems. When i used the command.. ausearch -i |grep chmod |grep 11203 I got the ...
1
vote
3answers
6k views

Giving PHP permission to write to files and folders

UPDATED FOR FURTHER CLARITY: According to http://expressionengine.com/user_guide/installation/installation.html, it says: For most Unix hosts the following is typical, but you may check with your ...
1
vote
1answer
73 views

How to give permission to group to read/edit unowned files on archlinux?

I'd like to be able to read files from external hdd or other partitions without having to su root every time or chmod the whole partition to myself/group. How can I give myself/group permission to ...
15
votes
6answers
8k views

Is there a web based converter between rwx and the octal version?

I can never remember what the conversion is from something like rw-r--r-- to 644. Is there a simple web based converter between the 2?
2
votes
3answers
36k 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
82 views

How can a user be prevented from changing a file that has write permissions for other users?

An odd situation came up recently. User1 needed to be able to change files in a directory were the files and the directory were owned by User2 and in group User2. In order to facilitate this ...
0
votes
1answer
59 views

How do I search for every file with executable permission (+x) in my system? [duplicate]

I need to find every single file that has executable permissions in my system, i think they end with x@. I tried to ls every file and then grepping the output to match files with x@. Like this: ls ...
1
vote
1answer
1k views

chmod: cannot access 'file' : No such file or directory error when the file exists

I downloaded and saved 2 files on Linux tails live os. I have set the appropriate permissions on those 2 files to allow them as executable. This is the command I used. sudo chmod 777 ...
15
votes
4answers
6k 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?
1
vote
3answers
90 views

chmod command to set a file as permission denied

I want my file not to be deleted by any user. Can I know the chmod mode command for the same? I need to get this kind of msg (rm ctl_model_fact.csv: Permission denied)
2
votes
2answers
145 views

print the /etc/shadow file in the console

How do I change the permissions of an executable file to access the /etc/shadow file? So far I have the following bash script: #!/bin/bash gcc print.c -o print chmod +s print ./print exit 0 and ...
0
votes
1answer
62 views

Executable directory? And chmod o+w changing the terminal directory color?

What does an executable directory mean? If o+w is set the directory changes colors to a background green, what does this mean? Why doesn't it do it for ug+w, but only for o+w? Additional question ...
5
votes
2answers
1k views

What is the result of running `chmod 7` on a file?

I know chmod 777 allows read, write, and execute for user, group, and others but what if I just do chmod 7? Is that only rwx for the user?
0
votes
2answers
297 views

Do I need to chmod 777 mounted volumes?

I have an openstack VM with the following users: [foo@influxdb ~]$ id root uid=0(root) gid=0(root) groups=0(root) [foo@influxdb ~]$ id foo uid=500(foo) gid=500(foo) groups=500(foo),10(wheel) ...
0
votes
3answers
33 views

Setting global browsable permissions for subdirectories (r-x) but making files inaccessible to everyone but the owner and group members

I typically have a directory where I want all users to be able to browse through but having files be unreadable and unexecutable. I see some related questions that do not exactly match what I want: ...
2
votes
1answer
177 views

setting default umask and user:group on directory

I have a directory data and I need to set default umask and ownership for all directories/files (both existing and future files). I want all files in data to have ownership root:martin ans ...
2
votes
1answer
104 views

ssh as super user

I did the following mistake on a remote server : # sudo chmod 700 / Now no user but root can do anything. I can't even ssh as a normal user anymore, since I don't have permission to access bash. ...
4
votes
3answers
8k views

How to check which Apache group I can use for the web server to write?

I'm trying to make Wordpress work. I currently have this error message: Could not create directory. /var/www/html/wp-content/upgrade/theme_name when trying to upload a theme. This is the ...
24
votes
9answers
7k views

Why use `chmod 644` instead of `chmod u=rw,go=r,…`?

I've been working on *nix for a few years now, and one of the things I just can't get used to is octal permissions in code. Is there some other reason than line length to prefer chmod 644 ... over ...
1
vote
1answer
295 views

Apply recursive chmod to files or folders only

I'd like to apply chmods to files and folders in one line, Basically: chmod 700 ./* -R # but only apply to folders chmod 600 ./* -R # but only apply to files Of course I searched google and read ...
0
votes
1answer
464 views

What does “execute” permission on a folder means? [duplicate]

I have read this topic, which gave me some info but I feel I am not fully getting it. What does the execute permission actually means on a folder? I fully understand what it means on a file, but on a ...
4
votes
3answers
2k views

Why can't I run programs on another partition in Linux?

So for convenience, I store all my data on my Windows partition so that I can access my data easily from both Linux and Windows. However, I tried compiling a C++ program with g++, and found out that I ...
29
votes
4answers
5k views

How to recover from a chmod -R 000 /bin?

And now I am unable to chmod it back.. or use any of my other system programs. Luckily this is on a VM I've been toying with, but is there any way to resolve this? The system is Ubuntu Server 12.10. ...
13
votes
4answers
13k views

How to get permission number by string : -rw-r--r--

I need to set the same chmod, how to get number for -rw-r--r-- ?
1
vote
2answers
250 views

relation between chmod and sudo on an executable file

What is the relationship between chmod and sudo on an executable file for a user? Are the cases that "a user needs sudo to run an executable" the same as the cases that "chmod hasn't set the ...
2
votes
3answers
648 views

File permission with setuid and octal 4000

When we set setuid to a file, we do the following in the terminal: chmod u+s filename This works fine. But the octal number 4000 is always associated with setuid (in books etc). I understand (to ...
4
votes
1answer
8k views

Change permissions for a symbolic link

I have a symlink with these permissions: lrwxrwxrwx 1 myuser myuser 38 Aug 18 00:36 npm -> ../lib/node_modules/npm/bin/npm-cli.js* The symlink is located in a .tar.gz archive. Now when I ...
4
votes
1answer
241 views

chmod doesn't work on folder 'd — — ---' permissions

In /var/www I've got a folder: d--------- 2 www-data www-data 4096 May 20 2012 update reported by ls -la. I'm logged in as root, but I can't change permissions or ownership. chown and chmod ...
1
vote
1answer
1k views

Set default permisson for newly folders and files in Linux

I'm using OpenSuSE and my computer has only 2 accounts: root and me.I have a directory /srv/www/htdocs/abc. I just want to set it up so that when new folders or files are created in this directory ...