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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316 views

Permission error to access mounted directory in localhost

OK, I formatted my flash to ext4 file system, changed all the permissions to 777 and mounted it to /var/www/html/web. Now, when i access localhost/web it gives the following error: "You don't have ...
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1answer
251 views

Changed file access to read only but I can still write to the file. Why?

I am running a small embedded system built using buildroot. I have come across this strange behaviour when trying to set up my file permissions on the target device. To illustrate what confuses me I ...
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1answer
74 views

Removing access privileges to backup while maintaining current setup

I have a giant directory, and I am dealing with a backup. I would like to store this backup in as safe of a way as possible. One of the ways of doing that is removing rwx privileges through chmod. ...
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1answer
1k views

Safe to change owner of OS X system folders?

I'm trying to get Homebrew to work. That program's diagnosis tool gives me these suggestions: You should probably chown /usr/local/etc ... You should probably chown them: ...
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2answers
3k views

Unable to change permissions of file system root

When I write ls -la the output is : tusharmakkar08-Satellite-C660 tusharmakkar08 # ls -la total 88 drwxr-x---+ 10 root root 4096 Apr 18 19:43 . drwxr-xr-x 4 root root 4096 Mar 18 17:35 .. ...
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1answer
136 views

chmod allowing write when I am not setting it

I've got a perl script which systematically changes permissions. The first thing the script does is remove all permissions. It does this by calling chmod(from perl). I did this as I found the set guid ...
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4answers
1k views

recursively chmod

I was trying to chmod folders and files with: find . -type d -exec chmod 755 {} \; find . -type f -exec chmod 644 {} \; But I was wondering: How to do it in one line using find and excluding the ...
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2answers
88 views

How can a user restrict their own group rights without being root?

How can I change my user rights from rwx to r-x at the group level? I'm trying to ensure that I cannot touch any data belonging to other users when I am developing and debugging my scripts. Once I've ...
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3answers
2k views

find . .[^.]* -type f -print0 | xargs -0 sudo chmod 664; does not work

I am using this command to set permissions for files recursively clime@vm6879 /srv/www-php/steeltrading $ find . .[^.]* -type f -print0 | xargs -0 sudo chmod 664 But after executing that command ...
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1answer
457 views

chmod and chown not working in sudo called script

Based on this Serverfault question, my git user has permission in sudoers to run a wrapper script to move files into my webroot with git. Everything is working fine except for the chmod and chown ...
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2answers
278 views

Files created by 'make' aren't getting executable permissions by default

I'm trying to build a project, and when I use the command make, I get the following errors: /bin/sh: line 4: .deps/ipset_bitmap_ipmac.Tpo: Permission denied make[2]: *** [ipset_bitmap_ipmac.lo] Error ...
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1answer
173 views

Able to delete file without permission [duplicate]

I've been experimenting with file permissions and ownership lately, and I tried this: touch a sudo chown root:root a sudo chmod 000 a I can't read, write, or execute the file, but I can still ...
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1answer
109 views

Why is ./filename required to run executable script? [duplicate]

After creating a Python script file, test.py, in my home directory, and running chmod +x test.py to make it executable, and placing #!usr/bin/env as the file header, I expected to be able to run the ...
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2answers
334 views

Is it possible to represent the +X symbolic permission with an octal value?

Is it possible to represent the +X symbolic permission with an octal value? The chmod(1) man page says: execute/search only if the file is a directory or already has execute permission for some ...
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1answer
6k views

script failing with “chmod: … Operation not permitted”

A script of mine works fine when I run it, but fails when run by a different user, with an error of the form chmod: changing permissions of `/A/B/C/D/E': Operation not permitted (Here /A/B/C/D/E is ...
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2answers
577 views

How to make a path world-readable?

To make some item X world-readable, it is not enough for it to have the right permissions: each component of the absolute path leading to it must also have the right permissions. (My understanding, ...
1
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2answers
966 views

chmod wont work - no error message

Everytime I try to change the permissions of a file with chmod on my Ubuntu with a command like chmod 744 /media/DATEN/Dokumente/Coding/Python/DirFileFuncts.py it doesnt work. I tried octal and =rwx ...
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1answer
1k views

Allow all group members to create directories and files

There are 2 users sftp_user apache Both users belong to the updaters group as well as other groups. New directories and files are created in the /updates/ directory. drwxrwsr-x 8 sftp updaters ...
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0answers
145 views

External HDD read/write permission changing from a cron job

So, I run an overnight python script that runs a backup of our web data in the /var/www directory, then moves the backups to an external HDD in /media. The script in scheduled in the sudo crontab ...
4
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2answers
7k views

Why does “chmod 1777” and “chmod 3777” both set the sticky bit?

To set the sticky bit on a directory, why do the commands chmod 1777 and chmod 3777 both work?
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1answer
134 views

Securely running LAMP under a specific user

I'm setting up a sandbox type of server that will be used by a couple users as a development environment and knowledge base. The server will have a web frontend so I've installed Apache, MySQL and ...
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1answer
167 views

Change who is able to chmod

Is there a way to change who can chmod (change the permissions of) a particular file? It is only the owner of the file (without sudo-ing it), if my experimentation has been correct? But what I want ...
2
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1answer
381 views

What does it mean if a directory has only x (executable) permission for certain user/group?

I stumbled across the directory /etc/ssl/private on Ubuntu (12.04), it has following permission: drwx--x--- 2 root ssl-cert 4096 7月 8 2012 private/ I wonder what does this mean for group ...
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1answer
268 views

Unable to change file permissions [duplicate]

Possible Duplicate: No effect of umask and chmod on mounted drives I am not able to change file permissions using chmod from the user who owns the file as well as from root. I am using ...
4
votes
1answer
601 views

Clear setuid permission using numeric mode

On an Ubuntu Linux I have a directory with the setuid bit set (drwsr-xr-x) which I want to unset. Neither chmod 755 nor chmod 0755 nor chmod 00755 (I though maybe the first 0 is interpreted as just ...
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votes
2answers
914 views

Fedora 14 command line: assign folder permissions

How can I assign folder permissions in Fedora 14 using the command line? I'd like to give read/write/execute permissions to : 2 users (tom, jim) to the folder /Home/Share 1 group (employees) to the ...
2
votes
1answer
447 views

Hide parent directory but allow to view dir

I would like the following result on my UNIX system: ls -l /users/test -> permission denied, or any other way so I can't see the content of it. ls -l /users/test/testdir/ -> shows all files in the ...
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1answer
3k views

what is the difference between “chmod 775” and “chmod 2755”?

Question What is the difference between "chmod 775" and "chmod 2755" ?
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4answers
4k views

When does chmod fail?

Under what circumstances will chmod fail? I looked at the man page but it only specifies usage and doesn't go into details about what circumstances it won't work in. I'd assume chmod will work if: ...
3
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1answer
172 views

How to create a folder which will change its contents’ ownership to what the folder has?

In a GNU/Linux OS there is no way to change ownership of a file until you are root. But what if I want to hide my system’s username e.g. before sending a file to someone, because some things like tar ...
4
votes
1answer
1k views

copying device nodes

I'm trying to transfer a working Linux installation to a new larger disk, so I've attached the new disk on a USB port, partitioned it and created filesystems. While copying all the files over I hit a ...
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4answers
4k views

How to make executable of all files excluding a few file types?

I have a folder containing many C source file and the same number of its compiled output files. I set executable bit to all this files but for some reason it was lost, making them not executable. (I ...
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4answers
10k views

How to permanently change the file/directory permission [closed]

How do I change the permission of file/directories such that I am able to create, edit, delete files/directories anywhere in my system? Currently I am using Ubuntu 12.04. I tried sudo chmod 777 -r ...
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2answers
15k views

Get the chmod numerical value for a file

In FreeBSD and also in Linux, how can I get the numerical chmod value of a file? For example, 644 instead of -rw-r--r--? I need an automatic way for a Bash script.
2
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3answers
167 views

User with read access to /home

Pardon my ignorance but I can't seem to come up with a solution to this one. I'd like to create a user that has read access to every user's home catalog located in /home. Do I need acl's for this or ...
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1answer
492 views

External drive chmod does nothing

Why is it that I can do chmod on my files when they are on my laptops hard drive, but when i make files on my external drive, i can't change their access rights. I do: chmod 755 somefile, and on my ...
2
votes
3answers
2k views

Change Folder Permissions

I started off with changing to the folder I want to change permissions for, and that is the opt folder. $ cd /opt/ test@testVM:/opt$ So I tried changing the permissions for this folder now using: ...
3
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1answer
1k views

Giving SSH users read-only access to a directory

I'm running Fedora 17 and I want to give several users access to files on my secondary hard drives on /run/media/haukur/. This is what I initially did: chmod -R 755 /run/media/ But every time I ...
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2answers
715 views

vim: create file with +x bit

Is there any way to set +x bit on script while creating? For example I run: vim -some_option_to_make_file_executable script.sh and after saving I can run file without any additional movings. ps. ...
16
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2answers
3k views

How to apply recursively chmod directories without affecting files?

After I apply chmod -R to a directory, permissions are changed for everything within (files and directories). How can I add execute/search (x) permissions to directories without modifying the files?
2
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2answers
831 views

execute bit on directories, but not files [duplicate]

Possible Duplicate: How to apply recursively chmod directories without affecting files? What is the command to apply execute permission for directories (for traversal), but leave the ...
4
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1answer
11k views

chmod: What does the `+a` parameter mean?

I was following a tutorial and it told me to run sudo chmod +a "SOME_PARAMS" some/dir I was surprised to see that fail telling me chmod: invalid mode: `+a' So I wonder: What does the +a mode ...
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1answer
1k views

No effect of umask and chmod on mounted drives

The windows drives are mounted at boot-time using pysdm. The setting were nls=iso8859-1,users,umask=002,sync,user,dirsync,uid=mtk When I try to change the permission of files using chmod, I don't ...
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4answers
2k views

Is chmod behavior wrong for symlinks?

Recently we had a problem on a Red Hat Linux box with many users: the /usr/bin/sudo binary has lost its sticky bit. Work was blocked until root user fix it (we need sudo for deploying and testing). ...
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2answers
3k views

If I change permissions on a tar file, will that apply to the files inside it?

I have a script that runs regularly via cron, that creates a tar.gz file for the purpose of backing up a directory. For reasons beyond my control, the only user who can execute the script via cron is ...
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votes
4answers
379 views

Run a given command on every subpath of a long path

Say I have a long path such as: /a/b/c/d/e/f I would like to run a command only on each of the subpaths of the path: e.g. If my command is cmd, I am looking for a one-liner that can do (perhaps ...
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4answers
922 views

grant permission in linux

I have a linux web server with 2 hard-drives. There are 2 users, one can access /home/user1 and the other user can access /home2/user2 I would like to grant user1 permissions to access /home2/users/ ...
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1answer
1k views

Chmod u-x isn't changing anything and I have no idea why

I'm a user on a Debian machine. When I create a file in my home directory, the default permissions appear to be 700, even though umask returns 0022: eulerz@foo:~$ touch testing eulerz@foo:~$ ls -l ...
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1answer
320 views

Make group permissions same as user permissions

I want to set the group permissions for all files and subdirectories within a certain parent directory to whatever the user permission setting for that specific file or directory is. For example, ...
5
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1answer
818 views

Can't get directory listing of folder I have permissions to

I was having some permission problems and used the following command on directory Media: chmod -R ugo+r Media It didn't help so then I did: chmod -R 775 Media Now I get this error when I try to ...