General :: Root (sudo) Can't Write To File It Created?
Mar 9, 2011
Debugging some of my scripts after upgrading from Debian Lenny to Ubuntu 10.04. In so doing, I tripped over this "problem," the solution to which may give me a clue to others.
On a bash shell command line I created a file thusly:
sudo touch zero_file
and it lists as expected with default permissions 0644:
-rw-r--r-- 1 root root 0 2011-03-09 11:18 zero_file
But then this command fails
sudo echo abcdef >>zero_file
-bash: zero_file: Permission denied
I can place the command (minus the "sudo") in a script & run it under the auspices of sudo & it works. Am I missing something re the stdin redirection when using sudo?
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Dec 21, 2010
My linux distro is CentOS 5.3. Today I edited /etc/sysconfig/readonly-root and set "READONLY" to yes, now my /etc/sysconfig/readonly-root file is like this:
# Set to 'yes' to mount the system filesystems read-only.
READONLY=yes
# Set to 'yes' to mount various temporary state as either tmpfs
[code]...
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Feb 19, 2010
I have set up a cron job in linux server using the command 'wget -q -o wget_outputlog url'
But on every run, an empty file being created at root.
How to stop this.
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Jul 9, 2010
When I run '# sudo touch newfile' my expectation was that the file would be owned by me, not by root, as my understanding of sudo is that it is giving me, the user, root priviledges but does not actually switch the user.Do I have a fundamental misunderstanding of what sudo is about?
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Nov 22, 2010
I have a really strange problem. I have a few files in a large directory that I want to make readable by everyone. So I try this:
sudo find readme* -not -perm -o+r -exec chmod +r {} ;
and get this:
sudo: unable to execute /usr/bin/find: Success
I don't know why it says Success, because the permissions were not changed. I verified by typing this:
find readme* -not -perm -o+r -exec ls -l {} ;
and get something like
-rw------- 1 root root 536871076 Nov 22 14:06 readme_20101122200429
-rw------- 1 root root 536871892 Nov 22 14:08 readme_20101122200642
-rw------- 1 root root 293458128 Nov 22 14:10 readme_20101122200859
as a last resort, I tried:
sudo chmod +r *
and got:
sudo: unable to execute /bin/chmod: Success
and again Success really means fail. So, I gave up and logged in as root and tried:
find readme* -not -perm -o+r -exec chmod +r {} ;
This time it worked. Why?
EDIT: /etc/sudoers looks like:
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
##Me
user1 ALL=(ALL) ALL
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Feb 3, 2010
I just noticed on my Ubuntu machine (ext3 filesystem) that removing write permissions from a file does not keep root from writing to it. Is this a general rule of UNIX file permissions? Or specific to Ubuntu? Or a misconfiguration on my machine? Writing to the file fails (as expected) if I do this from my normal user account.Is this normal behavior?Is there a way to prevent root from accidentally writing to a file (Preferably using normal filesystem mechanisms, not AppArmor, etc.)
I understand that root has total control over the system and can, eg, change the permissions on any file.My question is whether currently set permissions are enforced on code running as root. The idea is the root user preventing her/himself from accidentally writing to a file. also understand that one should not be logged in as root for normal operations.
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Jan 6, 2011
Kernel 2.6.21.5, Slackware 12.0
Code:
Code:
On the other hand
Code:
So, I do not understand why the notification "sudo: cd: command not found", considering cd is a bash built-in command.
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Aug 1, 2011
I'm a little bit confused with partitioning the filesystem in Linux. the difference between creating the file system with fdisk and mkfs (when formatting the disk). I can't clearly tell my problem, so please look at this picture:
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Apr 9, 2010
I was trying to edit a file requiring root permissions, so I used sudo. I typed the root password and it failed. This happened three times, and the process was ended. I then logged in as root (su) and was able to navigate to the file and make changes as root. Am I missing something? How would I edit the sudoers file such that this password would work? Or is there another way to log in to the sudo group to make these changes? How do I set sudo passwords?
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Feb 19, 2011
for some commands such as apt-get install xxx, I forget to add sudo first, then I need to retype it. What I want is in such cases, I just type a simple command, for example resudo. It will sudo my last command sudo apt-get install xxx. Is it possible in bash?
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Dec 29, 2010
I scan a document with root pressing the scanner button. I would like to send an email using my gmail account. OK. nothing difficult with that... mbsmtp + mutt for sending trhough the sh script.
1-root is to be avoided at max to do some internet duties, due to security. Apt-get is good, but ok surfing or email sending shall be avoided for higher security.
2- sudo or su running mutt through this way, ok, using an existing user. OK, possible and simple, but not comfortable since you have to use an account of an user existing (create a new user for scanner and email?? - no, come on, we have linux and can maybe find a solution)
how to send an Email from root console using an non created USER?
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Jul 9, 2010
When I run sudo as a normal unprivileged user, it asks for my password, not the root password. That's often convenient, but it reduces the amount of information someone would have to have in order to run commands as root. So how can I make sudo ask for the root password instead of the invoking user's password? I know it'd be done with a line in /etc/sudoers, but I can never seem to properly parse the BNF grammar in the man page to figure out exactly what to write.
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Jan 24, 2010
On my ubuntu I have a command pm-suspend, which puts the computer to sleep. It has to be run with sudo. Since it is inconvenient to be forced to type the password every time I want my computer to sleep, I thought maybe there's a way around it. Naively I thought that if I'd create a script as root, that invokes pm-suspend, and then let anyone execute that script, I could run that script as my own user and then that script would be considered run by root and hence be allowed to run pm-suspend. Obviously that didn't work. The root-check procedure in pm-suspend still found out that the original executor was someone different from root.
Still I think something similar (although slightly more elaborate) should work.I'm thinking about the process that allows the user to mount hard drives for example. Normally root is required, but it is somehow bypassed by the gnome utility mounting.
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Feb 8, 2010
Can a sudo user do everything what a root user can do? I read sometimes expert say "You should run it as root rather than sudo user".
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Mar 4, 2010
I just finished installing Karmic Koala on my computer a little while ago... and I chose to partition the drive manually. My computer has 2 hard drives:
Here's the HDD which boots first and has Grub and Ubuntu on it:
[URL]
And my second HDD which has Windows and a backup partition called "datas":
[URL]
And here's a copy of my /etc/fstab file:
Code:
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
[code]....
The ext3 partition on the 250GB drive called "datas" is an old partition that I created while I was still using Intrepid... and it works just fine. However the partition called "archives", which I created during the installation of Karmic, doesn't seem to work properly. For some reason I can't write any files or folders on it. Why is that?
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Sep 7, 2010
I need sudo for www (apache) user to run a shell script('ip.sh' contains iptables rules) from cgi-bin directory via browser using a per script. I edit sudoers( www ALL=(ALL) NOPASSWD: ALL ),but when run the bellow command that's with err:
# sudo -u www sh /srv/www/cgi-bin/ip.sh
iptables v1.4.4: can't initialize iptables table `filter': Permission denied (you must be root) Perhaps iptables or your kernel needs to be upgraded. And:
# ls -al ip.sh
-rwxr-xr-x 1 root root 243 Sep 7 14:18 ip.sh
I edit sudoers so
'www ALL=(ALL) NOPASSWD: /srv/www/cgi-bin/ip.sh,/usr/sbin/iptables' too. but it doesn't work too. how can I execute this script via browser ?
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Sep 9, 2010
In Ubuntu 10.04, I logged in as user1 and when I open a new terminal and issue any command it is asking password.user@ubun-laptop:~$ sudo ifconfig[sudo] password for user: It is asking for password only for first time.From the next command onwards it is not asking.Can some one please tell me if it is possible to issue ONLY ONE COMMAND, in which even if the password request comes, it will automatically fill the password.Just like "ps -elf | grep NetworkManager". I am expecting any combination of commands in a single line, so that password is filled automatically IF PASSWORD IS ASKED. If password is not asked, the command must be executed.
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Jul 25, 2011
can't cd to root acount /home in terminal - sudo cd /root fails?
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Aug 10, 2011
Accidentally I changed the ownership of all the directories under / to my own instead of root:root. Now I am unable to use sudo and many bad things are happening. Is there a way to revert the changes or change the permissions again to root:root or make sudo work ?
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Sep 16, 2010
I'm using CentOS 5.5. I am trying to write a script that will find recently created directories (touched within 30 days) and create a symbolic link to those directories in another folder. Here is the script:
#!/bin/sh
cd /home/chris/Documents/;
rm -rf ./recent_files/*;
find ./ -maxdepth 1 -mindepth 1
[code]...
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Mar 25, 2011
create one tar.gz file that contains my /home, /etc, /root directory.
a) The process ended with a 88GB file size (which is ok) but with the following message.Code: tar: Exiting with failure status due to previous errors.I have searched a little but I could not find what went wrong.
b) What are the limitations of tar and gz for backups. Of course I fully understand that they can not be used for differential backups (if it is called like that)
c) Let's say that my backup will be a file of 100GB and I want to see the contents of the .tar.gz. In kde there is a program called ark. Can ark handle so big files? Does it use my hard disk (eg. /tmp) to uncompress the file so to show me its contents? It might be the case that might be the compressed file is much bigger than the left space on the hard disk?
d) How can I do an integrity check when my tar.gz file is created?
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Mar 4, 2011
I need to change a filename but when I boot up I get the message root device is read-only. Is there a way of changing this so that I can change the filename. I have a Mac Pro running Leopard OSX. The graphics card an NVIDIA 7500GT or driver has failed. It was suggested elsewhere that I change the relevant kext files to filename.kext.old, which I did, now when I try to boot start in OSX I get a message in various languages telling me to restart. I have tried booting in safe mode and from original Installation CD. In Safe Mode I get the same multi language splash screen, from CD I still have the graphic card problem, screen freezes and artifacts appear. So I boot up straight into CLI by holding down CMD-S hoping to be able to change filenames back but it says device read-only.
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Jul 20, 2011
a server at work has been accessed through the desktop environment as root. I know this is a risk and since I have never done it before I was wondering if there are any files created by the desktop that could compromise the system and how could I clean it up.
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Jan 15, 2010
I am using mint 8 for a 2 weeks, I am noob to linux but I like Mint than any other linux distro which is great alternative to windows. I have a problem regarding password reseting.
1. My laptop automatically get logged in without asking user name and password.
2. I tried to change password for newly created user and root user using graphical way but it does not work.
2. I can perform administrator task using only OEM user which is default inbuilt user of mint.
How can make my laptop to ask password when mint get booted? How to change password for other users?
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Jun 25, 2010
To be specified,what I want to do is:
if I create xxx.php,#!/usr/bin/env php will be the first line of the file
if I create xxx.py,#!/usr/bin/env python will be added first.
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May 16, 2011
Is there any way to know which process had created any file in Linux Red Hat/CentOS 5?
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Apr 17, 2010
i created a script file named myscript.shi ran this by typing sh myscript.sh and i got my outputbut,when i tried to execute by typing ./myscript.sh i received permission denied errori gave permission as chmod 777 myscript.shthen i executed by typing ./myscript.sh . It worked fineso i wanted to know whether using sh and ./ with permissions are same.. ?or did it work for only this.. are there any differences
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Jan 31, 2010
I am just starting out in LINUX and I know the basic commands but I am a having a problem. I scoped the man pages but I can't get it. Maybe one of know... Can anyone tell me the cmd to figure out the system a file was created on? I just can't figure out this problem.
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Nov 24, 2010
I am looking for a way to be mailed a new file when it is created in a certain directory.I have found tools that will notify me when a file is created, such as iWatch with iNotify, but is there a way to actually be sent the new file when it is created.It is only a short text log file, but I would like to read it in my inbox rather than have to login and open the file each time an event is logged.
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Aug 31, 2010
when I tried to install Fedora on my pc, I got this error message " Defined Root partition not created a / boot/efi partition. I am trying to install it on a seperate hd. My main one has windows xp pro, but I do not want to interfer with that at all?.
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