1
vote
0answers
28 views

Can Linux be configured to wait for USB storage to be reattached instead of returning I/O error

If a usb_storage device is physically detached from an Ubuntu machine while it is still mounted, any attempt to access the file system will produce an I/O error. Is there some way to configure Linux ...
1
vote
0answers
12 views

File path in audit log instead of inode number

When I do: echo "#TEST" >> /etc/passwd I get the following in audit logging: node=kayak.office.local type=SYSCALL msg=audit(1412687666.054:62033): arch=c000003e syscall=2 success=yes ...
2
votes
1answer
67 views

How to let a user create a directory although not create a sub directory

I'm trying to create a Bash shell script that allows for the transfer of files from a flash device to a archive in which the user will specify. Although I'd like to restrict this user from not being ...
1
vote
0answers
27 views

Copying files to a directory shared via ACL doesn't get default mask

I'm trying to setup a simple shared directory on an ext4 filesystem for a group of users to work on. Let's say i just need to give all permissions to all users belonging to the group "workgroup" to ...
0
votes
2answers
61 views

Removing duplicated files in the rootfs - to speed up booting time, and improve memory usage

With Buildroot I'm making images for my Embedded Linux Hardware. Mainly I'm trying to speed up the boot sequence (and on the way lower the memory usage), where I've tried many techniques successfully. ...
4
votes
3answers
65 views

What is a good strategy to generate and copy files atomically

I have a file myfile that must be re-generated periodically. Re-generation takes some seconds. On the other hand, I have to periodically read the last (or next to last) file generated. What is the ...
1
vote
1answer
31 views

How does ACL calculate the effective permissions on a file?

I ran the following command to give the wheel group rwx permissions on new files and subdirectories created: [belmin@server1]$ ls -la total 24 drwxr-sr-x+ 2 guards guards 4096 Aug 27 15:30 . ...
3
votes
2answers
53 views

How often is the /etc/shadow file backed up?

From man 5 shadow: /etc/shadow- Backup file for /etc/shadow. Note that this file is used by the tools of the shadow toolsuite, but not by all user and password management tools. What I ...
1
vote
1answer
48 views

/proc/config.gz is of 0 bytes

I have an Android TV stck I compiled Linux for IT from https://github.com/Galland/rk3x_kernel_3.0.36 But when I booted that Image I found /proc/config.gz is of 0 bytes can some please explain how ...
3
votes
1answer
85 views

How does `stdin` of linux work?

I know that stdin refers to standard input in linux, usually the keyboard. It can also be referred by file descriptor 0. So, which file descriptor does the (standard input) mouse refer to? Or is it a ...
5
votes
2answers
191 views

File handles and filenames

I read this post. Are file descriptors the same as file handle? While trying to configure the linux kernel, it asks open by fhandle syscalls (FHANDLE) [Y/n/?]. Why is this option provided? Does ...
1
vote
0answers
21 views

Recover deleted files on Raspberry Pi? [duplicate]

So I just rm -rf'ed a folder with a few files I need. Yes I know I should've had a backup, but it's just a Pi. It's designed to be played around with! Is there anything I can do to recover that ...
4
votes
1answer
130 views

FILE size limitation according to Robert Love's textbook

From Robert Love's Linux System Programming (2007, O'Reilly), this is what is given in the first paragraph (Chapter 1, Page 10): The file position’s maximum value is bounded only by the size of ...
3
votes
1answer
79 views

Monitoring filesystem activity

Say, I have a program, and I want to monitor its filesystem activity (what files/directories are created/modified/deleted etc.) This program may be capable of spawning further processes, and thus, I ...
0
votes
1answer
48 views

setfacl remove all write access

I want to remove all write access to files & directories for any user or group while preserving other permissions. Is this possible?
0
votes
1answer
219 views

How do I create a RAM disk on Linux Mint?

I am running a package that adds data to the end of 140–300 files each time through the process. I'm thinking of moving the process to a RAM disk, and using rsync to copy it back when done. My goal ...
4
votes
1answer
317 views

Automatically detect when a file has reached a size limit

I would like to send an email when a file reach a certain size limit. The only way I thought of doing this is by doing a cronjob which will check the file size and send the email if the file is ...
3
votes
3answers
106 views

stout can not append to large files

I have Ubuntu 13.10. I have a keylogger to help me remember what I did. Running keylogger prints output to the terminal when I run it like this: keylogger I added it to startup like this: ...
14
votes
3answers
696 views

Move files and change ownership at the sametime

On Linux (Debian, Ubuntu Mint...), Is there any option command or something that I can use to transfer files to another user without having to do : sudo mv /home/poney/folderfulloffiles ...
1
vote
1answer
135 views

File has bytes - appears to be empty

I'm having the following problem: Some text files (also some binary files) on my system are listed with the correct file size but when I open them, they appear empty. >ls -la -rw-rw-r-- 1 user ...
2
votes
2answers
542 views

How to edit /etc/inittab?

I want to edit /etc/inittab in order to get a login prompt on the serial console once the system boots. By default, inittab file complains to be ro. I tried both gksudo gedit /etc/inittab and sudo vi ...
2
votes
3answers
360 views

How to recover from recursive 'chmod -x' on my home folder

I pressed ENTER after typing the following stupid command on my home directory: find . -type f -exec chmod -x '{}' ';' What do you advise as a fix for this. My guess is that I can't do anything but ...
5
votes
2answers
328 views

Difference between xattr and chattr

What is the relation and the difference between xattr and chattr? I want to know when I set a chattr attribute in Linux what is happening inside the Linux kernel and inode metadata.
4
votes
3answers
433 views

Hidden Files&Directories in user's home directory [closed]

I am in my user's home directory, I do: ls -a Then it shows me large number of hidden files and directories in my user's directory. Which of them I am allowed to remove? Which ones are necessary ...
4
votes
1answer
4k views

Changing a file's “Date Created” and “Last Modified” attributes to another file's

I'm using merge cap to create a merge pcap file from 15 files. For the merged file, I have changed the name to that of the first of the 15 files. But I would also like to change the merged file's ...
3
votes
4answers
153 views

Removing file which doesn't have any permissions and attributes

I have a file on my external hard disk named ._Icon^M.I ended up with this after using my hard disk on old Mac platform machine. I want to delete this file but unable to. For the command 'ls -al' it ...
3
votes
3answers
92 views

Why are file handles a scarce resource?

I feel like every tutorial I read on resource management in server settings starts by asserting that file handles are a scarce resource, and we should therefore aim to keep the list of open files to a ...
3
votes
3answers
304 views

Transform a directory into file or a file into directory

I wanted to create a file named test. Accidentally I run mkdir test instead of touch test. Is it possible to convert test directory in a file named test? What about converting a file named test into ...
0
votes
2answers
146 views

Make file in linux readonly

Is there a way to make a file readonly permanently in linux. Or can I put a password to a file to make it readonly, then apply that password again to change its permission, or before they can alter ...
5
votes
1answer
610 views

Cannot delete broken symbolic link

I have a symbolic link formerly pointing to a Dropbox directory. I don't know what I did wrong, but apparently now it points to itself. hyper@mypi:/home/hyper/test$ ls -l total 1024 lrwxrwxrwx 1 ...
3
votes
1answer
1k views

File inheriting permission of directory it is copied in?

I have files created into my home directory with only user read permission (r-- --- ---). I want to copy this file to another directory /etc/test/ which has the folder permission of 744 (rwx r-- r--). ...
4
votes
2answers
132 views

In Linux Fedora, How can I select files to move by time interval

How can I select and move files that were written in a specified time interval, such as 1530 to 1730 local time on a recent date? Background: I use Linux Fedora 12, and I have made my first, and long ...
1
vote
2answers
68 views

Something like a symbolically linked file, but with change details attached?

Is there a file type or method for using files in which certain files look and behave like symbolically linked files, but contain extra meta information for changing the data when they are read? ...
1
vote
1answer
121 views

Monitor file access count by user

I have written a script which is deployed just by putting it in a globally accessible location for all users. I want to log the usage of this script. Is there a way in Linux to find out how many ...
2
votes
1answer
100 views

How to FILTER the files with filename and then DELETE the OLDEST file from there? [duplicate]

I create and keep the following automated backup files e.g.: fruits_29-12-2013.gz fruits_30-12-2013.gz fruits_31-12-2013.gz sweets_01-12-2013.gz sweets_02-12-2013.gz sweets_03-12-2013.gz .. ...
2
votes
2answers
71 views

Why can users delete each others files in this case

I have two users : bob and sally, who resepctively own two files : bob100 and sally100: > ls -altrh /path/to/dir : -rw-r--r--. 1 bob test 0 Jan 7 12:59 bob100 -rw-r--r--. 1 sally test 0 ...
4
votes
1answer
242 views

file corresponds to /proc/locks

$ cat /proc/locks 1: POSIX ADVISORY WRITE 458 03:07:133880 0 EOF 2: FLOCK ADVISORY WRITE 404 03:07:133879 0 EOF The fields are: ordinal number(1), type(2), mode(3), type(4), pid(5), ...
2
votes
1answer
565 views

Error: permission denied on key 'fs.file-nr'

# sysctl -w fs.file-nr=131072 error: permission denied on key 'fs.file-nr' Same issue when I edit /etc/sysctl.conf and try sysctl -p. Any reason why I cannot edit this value? I am on CentOS 6.5
-3
votes
1answer
39 views

Blacked out html folder in root directory [closed]

Just looking through my system's directories and wondering about some of the contents. There is a blacked out (inaccessible) directory called html. I'm thinkging this is a bad link? I'm guessing and ...
4
votes
2answers
345 views

File access time not updating in ubuntu 12.04

After using the cat command to read a file, I used the stat command to view it's changed access time, but it's not getting updated. I checked /etc/fstab file and there is no noatime on any of my ...
1
vote
0answers
93 views

Map invalid file paths to valid file paths

I am running a program on linux which access an invalid location, say: /home/area/file. I know the valid location is /home/area/something_else/file. The problem is the input file for this program is ...
3
votes
2answers
88 views

Is there any mitigation against touch date/time forgery?

I have been using touch -t to change time of a file when I started using Linux, is there any mitigation against touch date/time forgery? Like, echoing original created date and time, even after using ...
3
votes
2answers
102 views

How to figure out what changes to which files a given command does, or even intercept them?

Say I've got a program mysterion the execution of which will probably modify some files. In order to figure out whether this is harmful or not I'd like to run it in such a way that I can at the very ...
5
votes
1answer
106 views

How do I find the full history of a file?

I need to know the full history of a file, like if someone changed or moved it to some other places since the time when it is created.
3
votes
3answers
82 views

Disallow File IO for a process except for FIFOs

How do you start a process that cannot do any file IO (opening / closing files, creating / deleting files, reading / writing files, etc.), except to read and write to pre-created FIFOs? (chroot will ...
4
votes
1answer
69 views

Map file to URL

I'm looking for a way to do something like this: some_tool --go-to-background http://server.com/~me/uber_vimrc ~/.vimrc After which, reading ~/.vimrc would give the data downloaded from that URL. ...
2
votes
1answer
1k views

Zabbix-agent: cannot stat 'filename.log': [13] Permission denied

I have installed Zabbix-server and zabbix-agent and trying to add trigger to check log file. But in /var/log/zabbix/zabbix_agentd.log I got the same error every time: 10832:20131008:125634.180 ...
20
votes
6answers
21k views

How to find creation date of file?

I want to find out the creation date of particular file, not modification date or access date. I have tried with ls -ltrh and stat filename.
3
votes
3answers
161 views

Transforming text to tabular form

I have a text file with the following structure: aaa bbb ccc ddd eee fff 1 2 3 4 5 6 1.1 1.2 1.3 1.4 1.5 1.6 ggg hhh iii jjj kkk lll 7 8 9 10 11 12 2.1 2.2 2.3 2.4 2.5 2.6 and I want the ...
3
votes
3answers
2k views

How to determine how many files are within a directory without counting?

I've been having a fairly serious issue on a high traffic web server. PHP pages are slowing down considerably, and it only seems to be an issue on pages where sessions are accessed, or a certain table ...