I want to know how can I negate a write permission for a file to an expecific user when that user have that permission becouse he belongs to a group what have a write permission for the file.
Create a second group that comtains all of the members of the first group except for this particular user. Then let the second group have write permission to the file.
I tried to use ACLs to restrict user privileges, and found that a user that is explicitly denied write perms in a file's ACLs will not be able to write to a file even if the group that the user belongs to has write permissions on that file.
I created a user test having group test, and created a file named testfile that has write permissions for the group test but is owned by root.
Code:
# id test
uid=1000462(test) gid=65546(test)
# ls -l testfile
-rw-rw-r-- 1 root test 10 Oct 10 10:17 testfile
OS: Solaris 8 -
I set the ACLs on the file to allow the user test to only read the file. Mask set to rwx.
Code:
# setfacl -m u:test:r--,m:rwx testfile
# ls -l testfile
-rw-rw-r--+ 1 root test 10 Oct 10 10:17 testfile
# getfacl testfile
# file: testfile
# owner: root
# group: test
user::rw-
user:test:r-- #effective:r--
group::rw- #effective:rw-
mask:rwx
other:r--
Next, I tried to write to the file as user test.
Code:
$ id
uid=1000462(test) gid=65546(test)
$ ls -l testfile
-rw-rw-r--+ 1 root test 10 Oct 10 10:17 testfile
$ cat >> testfile
ksh: testfile: cannot create
When I su-ed to user test and tried to write to the file,
Code:
$ id
uid=111(test) gid=20(users)
$ cat >> testfile
sh: testfile: Cannot create the specified file.
If your filesystem supports ACLs you can probably use them to restrict users from writing to a file even if they are part of a group that has write permissions on the file.
Is there a fast way to convert a negative decimal value into a signed binary number in bash script ? I've looked a lot on internet but I saw nothing... (For exemple : -1 become 11111111.) (9 Replies)
Discussion started by: Zedki
9 Replies
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Hi All,
I have received a notification that I have posted a question double times.
But I have not done all this intentionally. I have just joined this site and was not aware of the rules. Also I have my bits in negative.
what does that mean.
Thanks (1 Reply)
Hello, I am trying to write a bash script which will give me the most negative number. Here is an example input:
Ce 3.7729752124 -4.9505731588 -4.1061257680
Ce -6.9156611391 -0.5991784762 7.3051893138
Ce 7.6489739875 0.3513020731 ... (6 Replies)
How to change value in column 5 to negative based on value in column 2 ?
Example: For all records with A in column 2 change value in column 5 to negative.
file
Code:
1234~A~b~c~10~e~f~g~h~09/10/09
1234~A~b~c~75~e~f~g~h~11/12/10
1234~A~b~c~40~e~f~g~h~12/06/10
5678~B~b~c~2~e~f~g~h~01/11/11... (4 Replies)
I have read many tutorials and cannot get this to work. I need to use pcre (because that is what the library in the software we are using uses) and pcregrep everything except /home from the /etc/fstab
pcregrep '(?!/home)' /etc/fstab
It returns the entire fstab (This is on a RHEL5... (1 Reply)
I have a file file1.dat with the following lines
22885068900000652 B86860003OLFXXX592123320081227
22885068900000652 B86860003ODL-Sp592123420081227
22885068900000652-B94030001ODL-Ch592123520081227
23666483030000653-B94030001ODL-Ch000000120081227
23797049900000654-E71060001OLFXXX000000220081227... (3 Replies)
Hi,
I want to search for a return code of -3. Using grep "-3" *.* is giving a syntax error. Please suggest as to how can we search for this pattern using grep.
Thanks,
Krishna (2 Replies)
Hello,
I need help to write a script to do the following:
1) read the following file vol_check.out
2) report any negative value with host and volume name
vol_check.out file contents:
---------------------------------- prod_filer1 ---------------------------------... (2 Replies)
Function: int fcntl(int fd, int cmd, struct flock * lock)
Data Type: struct flock
This structure is used with the fcntl function to describe a file lock. It has these members:
off_t l_start
This specifies the offset of the start of the region to which the lock applies, and... (1 Reply)
10-12-2006
