As I understand the file permissions in UNIX is basically
Owner, group, others
Lets assume scott user who's primary group is dev creates a file called test.dat and then grants some privileges on that file...
Code:
scott@unix-host> echo "this is a test" > test.dat
scott@unix-host> chmod 640 test.dat
scott@unix-host> ls -l test.dat
-rw-r----- 1 scott dev 960 Apr 1 2011 test.dat
Now, let's assume user Tom who's primary group is also dev logs in and tries to delete the test.dat file created by scott..
Code:
tom@unix-host> rm test.dat
test.dat: 640 mode ? (y/n) y
surprisingly, Tom was able to delete the file. I thought only scott user would be able to delete test.dat file as only the "owner" (as in owner,group,others) has "rw" privilege..I'm a bit confused as to how Tom was able to delete the file even though "Group" has only Read access...Could you help me understand this?
Thanks for your time...
Thanks
Last edited by Scott; 04-07-2011 at 08:06 PM..
Reason: Added code tags
I'm trying to answer the following question about file permissions in Unix. Consider a file with the following permissions:
rwx---r--
I am not the owner of this file, but I am a member of the group of this file.
My question is: do I have read access to this file?
I thought... (3 Replies)
netjk@rediffmail.com
I have a Shell Script (wrapper) that gathers parameters and invoke a base script (lets say B1). I have set the permission for this script as 711 (execute for everyone, group). When a user from another group try to execute the script, permission is denied (Cannot open file..)... (1 Reply)
Hi all,
ok here is my problem, my program below is reading lines in from a file (one at a time) and printing them out. my problem is that i want it to only print out 3 lines at a time on the screen, but the "read value" command in my code isnt working. Whats wrong? & what can i do to get this... (1 Reply)
Hello all,
I need to write a little unix script to do some work on multiple files. I need to enter the filenames from the command line (scriptname <filename> <filename>. I have written the code to do double spacing, and some line numbering but it does not take multiple files from the command... (1 Reply)
Hi,
I am fairly new to Unix. My school computers have only UNIX installed on them, and I wish to use them to do some parallel computing. To do so, I need to transfer the files from my Windows computer to my Unix account on a different computer.
I am using the SSH login with the Putty client.... (2 Replies)
Dear all,
I got some questions abt how does the Unix kernel work
with the work with the other components. (step by step)
Can any body tell me some info abt that? if can provide
a example for each question that gonna be perfect!
Thank you!!!
1. How file management system work together... (2 Replies)
Hello all,
I am trying to write a simple script that will parse through a text/properties file and check a couple of if statements.
Here is what I have so far:
FILENAME=$1
while read line
do
echo $line
done < $FILENAME
When I call ./simple.sh testfile.txt I recieve a file or... (7 Replies)
I am trying to FTP files from windows to UNIX (IBM AIX). After having sent the files to unix server. Permisssion of the files becomes 640 (rw-r-----). I have to manually login to unix and do chmod 644 on the folder to give it permission. Is it possible that the files automaically be set to 644 on... (2 Replies)
Hi ,
I just write a simple function to read the file line by line.
But when I run it it says out of memory.
I am not sure about the root cause, Can someone help me out of this?
:D
#! /usr/bin/perl
use strict;
sub checkAPs{
my $NDPDir = "/home/eweiqqu/NCB/NDP_files/";
... (1 Reply)
Experts: i want to change this permission back to the way it was:
Initial:
drwxr-xr-x 8 oracle oinstall 4096 Jun 5 15:21 oracle
Now: drwxr-xr-x 8 oracle oinstall 4096 Jun 5 15:21 oracle
drwsr-sr-x 8 oracle oinstall 4096 Jun 5 15:21 oracle
Now I want to switch it back to ... (2 Replies)
Discussion started by: sumang24
2 Replies
LEARN ABOUT OSF1
groups
groups(1) General Commands Manual groups(1)NAME
groups - Displays your group membership
SYNOPSIS
groups [user]
DESCRIPTION
The groups command writes to standard output the groups to which you or the specified user belong. The Tru64 UNIX operating system allows
a user to belong to many different groups at the same time.
Your primary group is specified in the /etc/passwd file. Once you are logged in, you can change your active group with the newgrp shell
command (see sh). When you create a file, its group ID is that of your active group.
Other groups that you belong to are specified in the /etc/group file. If you belong to more than one group, you can access files belonging
to any of those groups without changing your primary group ID. These are called your concurrent groups.
NOTES
The /etc/passwd and /etc/group files must be on the same node.
EXAMPLES
To determine your group membership, enter: groups
The groups to which you belong will be displayed. For example: devel prod
FILES
Contains group information. Contains user information.
SEE ALSO
Commands: csh(1), ksh(1), sh(1)
Functions: initgroups(3), setgroups(2)groups(1)