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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MySQL Backup folder permissions - Non downloadable by others

I created a PHP script which takes backup of the mysql database every day and then saves it to a folder called "BkPath". All the backups will be saved here. But am trying learn the chmod command to ...
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3k views

how do I mount a CIFS share so I can fully control the mounted volume on the client

It's a simple question: but I am in much pain over this situation, so here is the question: How can I "mount" a share so that a) the share is run on boot b) that I can control things like chown/chmod ...
2
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1answer
82 views

How to copy permissions from owner to others using `chmod`?

Is it possible to recursively copy the permissions of owner to group and others for all files in a given directory? PS: my chmod is 5.97
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2answers
650 views

How to exclude hidden files in recursive chmod?

I am having to do chmod -R 755 some_dir where 'some_dir' contains '.git' folders. Is there any way I can exclude hidden files and folder when doing recursive chmod? Note: chmoding .git folder is ...
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4answers
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permissions 755 on /home/<user>/

I am wondering why by default my directory /home/<user>/ has permissions set to 755. This allows other users to enter into directories and read files in my home. Is there any legitimate reason ...
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753 views

Chmod by Letters Vs Numbers

I was recently asked by a colleague to use chmod with letters instead of numbers. Apart from the obvious readability advantage is there any particular reason to use letters over numbers ?
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2answers
2k views

Unable to run 'sudo chmod +w /etc/hosts'

I am logged into my remote VM (running out of ESXi) as user xyz. I wanted to change my /etc/hosts to add some network names that were not visible by default. I first tried to run sudo vi /etc/hosts ...
1
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1answer
45 views

trying to search inside chmod with command [duplicate]

I am trying to find commands with the word "symbolic" inside the contents If I type man chmod and /symbolic you can see that chmod command has the line of "new modes of the file will ...
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1answer
382 views

Equivalent of full control, modify and write in linux

What is the equivalent of assigning Full control, Modify and Write permission, in Windows, to a particular user and group, in Linux? chgrp, chmod and chown seems quite limited in this case.
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2answers
72 views

Is there a flag corresponding to x/X, but for s with chmod on Linux?

When using chmod (in my case part of coreutils 8.12), and recursively setting the x bit, there exists the convenient X (uppercase letter x), to set the bit only on directories. So if you wanted to ...
4
votes
1answer
6k 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 ...
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2answers
103 views

FS permission scenario

How can I achieve this files & folders permissions scenario: Consider these folder: Folder A: 640 root apache /var/www/A/ Folder www: 640 root apache /var/www/ and this linux user: id user1: ...
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2answers
652 views

How to hide someone else's directories from a user?

I have several folders: /home/user1/ -u user1 -G user1 /home/user2/ -u user2 -G user2 /home/user3/ -u user3 -G user3 I created three users user1, user2, user3. Each user has own group. Any user can ...
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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 ...
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3answers
3k views

How can I revert a chmod on the etc directory?

I accidentally executed the following command on the etc directory: sudo chmod -R 700 /etc I know that I have done something very wrong. My terminal now prints: I have no name!@ubuntu: /$ How ...
107
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7answers
8k 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 ...
2
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3answers
377 views

Safer way for granting permissions for self user?

I know sometimes we can do chmod 777 so we have a directory at our complete reach for accessing, reading and writing. But usually I prefer to do a sudo chown {myusername} {directory}. Obviously, the ...
2
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3answers
439 views

'setfacl' permissions don't apply to directories created by git clone?

Here's how I am setting permissions for my website's root directory i.e. ~/public_html, where the files that my website serves are placed: sudo chgrp -R www-data ~/public_html chmod g+s ~/public_html ...
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3answers
464 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 ...
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4answers
2k views

chmod recursive permission on thousands of files

This is a more general question about 'chmoding' recursively. I have this script which at some point needs to change the permissions recursively in a folder which has a few hundred thousand files. ...
0
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1answer
33 views

how to display I/O file on shell [closed]

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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1answer
293 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
218 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 ...
28
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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. ...
0
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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
2k 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
130 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 ...
3
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2answers
86 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
1k 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 ...
1
vote
1answer
433 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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7answers
5k views

Convert ls -l output format to chmod format

Say I have the following output from ls -l: drwxr-xr-x 2 root root 4096 Apr 7 17:21 foo How can I automatically convert this to the format used by chmod? For example: $ echo drwxr-xr-x | ...
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2answers
206 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 ...
1
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1answer
159 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 ...
1
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2answers
1k views

Find all directories, in which user has access to search and echo this directories in shell

I need to find all directories, in which user has access to search(command find) and echo this directories in shell. USER is read from ksh. for example: read user I know, if user want to use find ...
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1answer
102 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 ...
2
votes
1answer
5k 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
825 views

Executable located in location A how to run it in location B?

So, I've an executable in my debian server and this executable located in /home/human/ExecuteIt, still i cant figure it out how to run my executable in another location. In my case it is ...
1
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2answers
484 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
vote
2answers
810 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 ...
1
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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
141 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
votes
2answers
6k 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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vote
1answer
114 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 ...
2
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1answer
332 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 ...
3
votes
1answer
163 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 ...
4
votes
1answer
547 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 ...
2
votes
1answer
412 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 ...
2
votes
1answer
5k views

Why can I not chmod a file?

[nathanb@ka /x/sim/nathanb/nbsim1] ls -al ,nvram -rw-r--r-- 1 root root 2097152 Jul 5 2011 ,nvram [nathanb@ka /x/sim/nathanb/nbsim1] sudo chmod a+w ,nvram chmod: changing permissions of ...
5
votes
1answer
3k views

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

Question What is the difference between "chmod 775" and "chmod 2755" ?