0
votes
2answers
131 views

Why my setting with NFS and setuid not working in Linux

I'm using Linux. On machine A I have such NFS setting in etc/exports: /home 10.0.129.130(rw,no_root_squash) I mount this directory on machine A on /home/nfs/ on machine B. And I've set setuid using ...
0
votes
2answers
357 views

Check If a script is executed as root?

I have a script that requires root privileges. I have to execute it either via sudo or from an account with uid 0 (e.g. root). If the script is not executed with sufficient rights then I want that ...
3
votes
1answer
211 views

How does sudo actually work?

How is it possible for sudo to actually function? If it's just a normal program, couldn't you make the same thing without requiring the user to authenticate, giving anyone with access to a computer ...
0
votes
1answer
225 views

Why do linux packages expect root permissions to install?

This is a question about the design choices of *nix, not how to avoid it. What is the purpose for requiring root access to install most packages? It seems like a potential security hole to require ...
3
votes
3answers
290 views

Can we have a user with the same powers/priviliges as root?

I am confused on the following in linux. Can I have a user to have the same permissions as the root. In Windows any user can be the administrator but I am not clear exactly about this on Linux. It ...
1
vote
1answer
134 views

Are there risks installing Dropbox using root on Unix?

I have installed Dropbox to my Unix server via SSH as root. I'm wondering if this was a bad idea as Dropbox is now contained under the the root home folder. Are there any additional security ...
0
votes
0answers
71 views

Can someone put some restriction to copy few files from folder by root in linux

I have the backup script where i was making the tar backup of directory everyday. ON friday i note that my filesize was 30MB but beofrethat it was 200MB. I checked the main folder and it was around ...
0
votes
5answers
1k views

Second root account

i'm new in linux, so i'm sorry if my problem is a bit confusing. I'd like to do following: create a second root account write the file by using this account the first root account shouldn't be able ...
5
votes
3answers
1k views

Why is the dreadful 'rm -rf /' even allowed? [closed]

We all know the destructive power of the following command executed as root: rm -rf / Related questions: How far will you get with a 'rm -rf /' deleting everything: # rm -rf / I fail to ...
120
votes
8answers
110k views

What is the “You have new mail” message in Linux/UNIX?

Sometimes, when I log into a box and 'su' to root, I get a cute little message saying I have mail (thank GOD it's not AOL). Where is this mail? What does it contain? Who/What sent it? How important ...
6
votes
2answers
717 views

Potential issues with adding /usr/local/[s]bin to root's path?

I've noticed that the root account $PATH does not include /usr/local/bin or /usr/local/sbin by default. Are there any potential issues that could arise from adding those directories to the path? If ...
13
votes
3answers
11k views

UNIX - mount: only root can do that

I need to allow a non-root user to mount/unmount a device. I am a total noob when it comes to UNIX, so please dumb it down for me. I've been looking all over teh interwebz to find an answer and it ...
10
votes
4answers
8k views

removing write permission does not prevent root from writing to the file

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 ...
1
vote
3answers
2k views

Why can't Unix users renice downwards?

I know that non-root users can renice a process up, but not renice a process priority down. $ nice yes >/dev/null & p=$! $ renice 15 -p $p 8414: old priority 10, new priority 15 $ renice 12 ...
2
votes
6answers
1k views

How do I create a new user account on an Ubuntu Hardy server?

logged in as root, environmental variables are great. I typed "set" I did: useradd -m alex su alex For some reason, everything is gone when I type "set". How do I make it so that alex has all the ...