Ubuntu :: Avoid Users Writing On The Same File?
Feb 27, 2011
Is it possible to forbid that more then one user open the same file in rw mode? In windows when you open a file that another user is using, there's ad advise and you have to open it in read only mode
I installed ubuntu 10.04 desktop edition on 3 pc (there is not a server-client architecture). I installed samba.(and smbfs)
put the strings:
[name]
comment = ...
path = /...
guest ok = yes
read only = no
create mask = 0777
directory mask =0777
Computers that access to that directory do (on boot, with root privileges)
mount -t smbfs -o username="user",password="pass" //192.168.0.12/name /mnt/cartelladimontaggio
But if two users access to the same file, both are authorized writing on it! So changes made by one are lost when the other save.
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Jan 17, 2011
I would like not check first, and if not ok, then to write the permssisions. Means no use to write endessly on disk if not needed. How to check and fix the permissions to avoid writing (chmod o-rwx /home/*) ?
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Oct 21, 2009
I'm using opensuse and i'm trying that users cannot change his own password (mantaining /bin/bash users active). Do you know how can I do it?
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Jan 7, 2011
i just want to prevent from now on from all users maybe even root from adding other users to groups like wheel for example. I also want to know how can I prevent from all users to create new groups or add users to new one.real
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Jun 16, 2011
I have a handful of openSUSE 11.4 machines that I allow users to use the GUI for web surfing and writing documents and I am meanwhile running scientific computing jobs in the background. Every now and then, someone clicks "shutdown", "reboot", or "hibernate" and ruins my afternoon.
I've searched Google and these forums for ways to prevent a normal user from shutting down the system, but so far haven't had any luck in finding a solution. I have found instructions for just about every other Linux OS, except openSUSE though. These machines are running LXDE, but my preferred solution wouldn't depend on the particular desktop solution in use.
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Sep 6, 2010
I'm facing difficulty while writing to an already existing file . I'm making a shell (programming in C). I want a file (say , logfile) to keep a record of all the commands a user enters. For the first command it runs fine , but for the second time and thereafter it overwrites the previous contents. How do I avoid this?
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Nov 30, 2008
I am running Intrepid Ibex 64-bit, and I have recently ripped a cd with EAC on one of my windows boxes, and it produced a cue sheet and one single wave file for the entire cd. My question is this, is it possible to take the wave file, burn an ISO image that acts exactly like the original cd? In other words, take the single wave file, using the cue sheet splitting it back into it's individual tracks, and then reading the subsequent ISO image from a program like Sound Juicer, so it can write all the metadata and convert it with my own preferences. I know this is a very strange predicament, but it's one that would save me a world of hassle.
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Feb 24, 2011
However, configured a website on a dedicated server using WHM/cPanel. The site was uploaded using the master account for the website.
The security issue is public users are able to upload files on to my server via the website. They could even access the root and execute whatever they want on the server.
I have consulted with 2-3 Linux experts. According to them, the PHP user has rights to execute anything on the server or upload & store files in whichever folder they want.
Can I protect my folders to avoid file uploads via the website. The application has security vulnerabilites. However, I want to prevent hackers to enter my site until the vulnerabilities are fixed.
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May 28, 2011
I have an Ubuntu development server and a Windows 7 workstation. I use Windows Gvim to edit files on the linux server, over a samba connection.Saving files from Windows change the Linux permissions in weird way depending on the Windows app I'm using and also depending on whether there's a file extension or not.Here are some testsNo extension; Notepad2: 644 to 764
matt@mattserver ~ % ls -l testfile
-rw-r--r-- 1 matt matt 0 2011-05-28 07:09 testfile
--- Save from Windows Notepad2 over network ---
[code]....
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Apr 1, 2010
I am trying to write into a single log file from 3 different applications in C. In one of the applications I am forking out 5 instances. I would like to know what is the best way to open and close the log file in which i want to write from these applications. Should I open and close it at the start and end of each application or is it ok performance wise if i open and close it inside the log function which will be called for every write.
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Mar 3, 2011
i am having a the following line in a file
<property name="connection.password"></property>
i have to give password in this line, like this
<property name="connection.password">XXXXXX</property>
Is this possible to acheive this using sed command
Beause i have to do this for n number files. so if i have option in sed for this the i will be doing this using script.
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Oct 24, 2010
i am trying to create a floppy boot disk as my computer doesnt support booting from cd. I have downloaded ntrawrite and placed it in a file with the sbm file and followed these instructions [URL] which i found here.
when i type in the command i get the response "ntawrite is not recognised as an internal or external command"
Is the problem that im not opening the cmd in the right directory? I dont know how to change this.
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Jun 27, 2009
I recently upgraded my file/media server to Fedora 11. After doing so, I can no longer copy large files to the server. The files begin to transfer, but typically after about 1gb of the file has transferred, the transfer stalls and ultimately fails with the message:
"Error writing to file: Input/output error"
I've run out of ideas as to what could cause this problem. I have tried the following:
1. Different NFS versions: NFS3 and NFS4
2. Tried copying the files to different physical drives on the server.
3. Tried copying the files from different physical drives on the client.
4. Tried different rsize and wsize block sizes when mounting the NFS share
5. Tried copying the files via a different protocol. SSH in this case. The file transfers are always successful when I use SSH.
Regardless of what I do, the result is the same. The file transfers always fail after approximately 1gb.
Some other notes.
1. Both the client and the server are running Fedora 11 kernel 2.6.29.5-191.fc11.x86_64
I am out of ideas. Has anyone else experienced something similar?
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May 3, 2010
How can we write arrayValues in file? Lets say arrayName=(1 2 3 4 5) Now if i want to write these arrayValues into file
In first line in file :1
In second line in file :2
In third line in file :3
In fourth line in file :4
In fifth line in file :5
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Mar 18, 2010
I am using Grass GIS
I have written a script which outputs a list of numbers to a file
code snippet:
r.stats -1 fs=, input=Bones_AVE > /home/gary/AVE_monte_carlo/rstats_AVE$i.csv
so this makes acsv file with one column. I want to run it again but rather than outputing to a new csv i want to add it to this one as the next column. For this example there will be 100 rows per column.
the 1st one will make the file
[grassGIS code]> /home/gary/AVE_monte_carlo/rstats_AVE.csv
add ',' after each value
the next one
[grassGIS code] open file /home/gary/AVE_monte_carlo/rstats_AVE.csv
[Code]....
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Apr 10, 2010
I'm not able to write to a file using my perl cgi script which is as fallows:
Code:
#!/usr/bin/perl -w
use strict;
print "Content-type: text/html
[Code]....
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Apr 11, 2011
Is it possible to write ksh script in the spec file? The target is after I perform
rpm -i my_rpm.rpm
According to the spec file, ksh script will do some installation & configuration. For example run other script and edit some files.
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Mar 3, 2009
I have custom software that writes to a sensitive large file when the user does something. I would like to make backup copies of The file that gets written to, but if I make a gzip of the file at the same time someone is changing something, it will corrupt the backup because some of the data will be missing, as its backed up during being written to.
a) Is there a way to detect if a file is currently being accessed/written to?
That way if its currently being accessed, I can just make the script wait until its done and then finally back it up.
b) Instead of backing up the large file while it has potential to get written to, would it be better to make a copy of the file first, then gzip the copy? This idea comes from the fact that gzipping the original takes 5-10 seconds, whereas making a copy only takes 1-2 seconds. The less time, the less chance of corruption.
c) Is there anyway to freeze a program or a file to stop it from being written to for an amount of time?
With a, b, and c together. The best solution I have to my problem would be a script that first detects rather the file is being accessed. If not, it would then freeze the file/program and then make a quick copy of it. Once the copy is created, it will unfreeze the original file/program and then go about gzipping the copy.
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Apr 8, 2010
I have 3 c files(one of them forks out 5 instances) all writing to one log file. Now to avoid the confusion of opening and closing in each application or instance and running into a situation of not having closed a file I decided to open and close the log file inside the log function for each write.
So what I do currently is fopen, flock, fwrite, unlock, fclose for each write. All the log messages from all the files get written fine and there are no errors but I see a performance hit. The applications talk to each other using SHM(shared memory). So when I try to set a timer and check number of messages lets say I get X messages. Each time I remove or add a log call the number of messages changes. When it is a 1 sec or 5 sec timer it doesnt make a very big diff..few hundreds but when I check it over a longer period..every log call added decreases 1000 messages in count. So I want to know what is an efficient way of implementing the custom log across the application.
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Jun 3, 2011
Code:
int main ()
{
[code]...
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Feb 23, 2011
is it possible to write ksh script in the spec file? the target is after I perform rpm -i my_rpm.rpm according to the spec file , ksh script will do some installation & configuration for example run other script and edit some files
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Nov 5, 2010
I'm using ubuntu 8.10 which is already installed. Recently I have downloaded ISO file of ubuntu 10.04. Is there any way to install that ISO file i've downloaded without writing the ISO file in a CD?
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Dec 2, 2010
I am trying to read a file character wise and trying to write the same character to another file. In this process, I unable to read and write white spaces successfully to the new file. The script reads the white spaces but while writing the white space is lost. The section of the code, is given below. Please advice how can i read and retain the white space while writing to a new file.
Code:
if [ -s f_test.txt ] && [ -f f_test.txt ]; then
echo "File Exists !!"
while read -n1 char; do
[code]....
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Mar 9, 2011
it is about the program sha1sum to create SHA1-hashes. As you probably know, SHA1-Hashes do have the length 20 byte. So when I just type:
Code:
sha1sum myfile
it produces an output of
Code:
(some20byte) myfile
just as it should. Now I want to store the 20byte hash in another file, I use this command:
Code:
sha1sum myfile | awk "{print $1}" >> myhash
Unfortunately I'm not familiar with awk, but this should cut off the end of the sha1sum output, which is the name of the file again. The problem here is: The newly created file myhash has the size 41 bytes, and printing it out I can see that it is not the original hash (I wrote a little program to print it bytewise).
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Apr 23, 2010
My program need to monitor the foler to know which file under the folder is being opened/created for writing. I add the folder into watch list using inotify_add_watch, when a file -- say 'AA' -- is created, I'll get the event through read api call. But the inotify_event only have file name 'AA' and a event mask. these parameters can't help me to know how the 'AA' is created/openned. So I have to scan the /proc folder to get to know how is 'AA' created/openned. I don't think this is a efficient way, especially if there are lots of files are openned/created in a short time span.
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Jun 20, 2010
There is the Archive::Zip I think I can use with Perl 5.10 but I don't know how. I don't want to read or write any files, just zip something in memory, with best compression, like
$text = "this is a test";
$zippedtext = &Zip($text);
sub Zip {
[code]...
I guess it's only a few lines.
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May 24, 2011
i am working on this thread: [URL] if it is better to open a file every time i need to write to it or should i keep a file open the whole time and when i am done with the script, close it and sendmail it out?
Or i just thought of this: i could keep concatenating to a string and just sendmail when done.
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Apr 21, 2010
When trying to conigure via nvidia-setting using root (sudo) and then saving to config file I get the ' Unable to open X config file '/etc/X11/xorg.conf' for writing.' in a message box - below is what i get on terminal:
Code:
Traceback (most recent call last):
File "/usr/share/screen-resolution-extra/nvidia-polkit.py", line 75, in <module>
operation_status = main(options)
File "/usr/share/screen-resolution-extra/nvidia-polkit.py", line 51, in main
[Code]...
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Apr 29, 2011
Go to a specified directory and open a log file and parse out specific information and dump it into another text file.
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Mar 22, 2011
I have installed bluez libs,utils and all the requirements for bluetooth communication. And i am able to scan other bluetooth devices around. Will somebody please suggest me on how to start writing code for file transfer in bluetooth. Or can I get any packages online to do that for me. I am using RHEL5 and x86_32.
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