@Don Cragun........What you say contradicts my longstanding generic understanding that 'sticky bits' cause a file to remain in virtual memory not become virtual memory. It is used (typically) on very frequently used executables to prevent them having to be loaded from disk every time thereby vastly improving load time of the application. Do correct me if I'm wrong.
If a directory is writable and has S_ISVTX (the sticky bit) set, files within that direc-
tory can be removed or renamed only if one or more of the following is true (see unlink(2)
and rename(2)):
o the user owns the file
o the user owns the directory
o the file is writable by the user
o the user is a privileged user
If a regular file is not executable and has S_ISVTX set, the file is assumed to be a swap
file. In this case, the system's page cache will not be used to hold the file's data. If
the S_ISVTX bit is set on any other file, the results are unspecified.
Your longstanding generic understanding is correct for executable files. A file that ls -l shows up as:
Code:
-rw-r--r-T 1 mark support 875166720 Mar 23 2005 file_mig.dat
as is being discussed in this thread, is not executable.
Last edited by Don Cragun; 03-04-2014 at 03:53 PM..
Reason: Add note about difference between executable and non-executable regular file sticky bit processing.
I have a questions, whose answer may be very obvious:
Of what use is the sticky-bit permission on a Unix system?
I have looked at the chmod(1) man page on our HP-UX playground
system, and haven't been given much explanation:
Add or delete the save-text-image-on-file-
execution (sticky... (3 Replies)
I have the sticky bit set on my /tmp directory, but users are still able to remove files that are not owned by them. Does the /etc/group file get invloved in securing these files ?? (1 Reply)
Hi,
could anyone please send me a link to learn/ know more about sticky bits? I am still not clear on the application of using a sticky bits.
Thanks for your help.
Regards,
UP (3 Replies)
Hi ,
I am having file permision as
drwxrwsr_x
I kwo for deleting a file in the diretory i need w permsion as well ..
Say if i am having the permsion as
drwxrwsrwx - wil any one can delete the files in the directory ..
And one more question what is the s doing there ..... (2 Replies)
HI
What is sticky bit?
how can be see if the sticky bit for file is set?
WHat is meaning of sticky bit set on Directory?
What is the syntax to set the sticky bit? With example
Thanks (10 Replies)
Hi,
I understand the purpose of sticky bit on directories. But I am not very clear about what the sticky bit do on a file.
Can any one explain me in detail and with example please.
Thanks in advance. (1 Reply)
Hi all,
I have trouble working with Sticky bit in solaris,
I am able to delete files and directory from the directory who has sticky bit set , i have verified that i am neither owner of the file pr directories..
I have check in Solaris 7, 8 ,9 ,10, versions, that does not seem to work..... (8 Replies)
What is sticky bit ...and where we aill use this.. how to set this bit in files and directories (1 Reply)
Discussion started by: udtyuvaraj
1 Replies
LEARN ABOUT FREEBSD
sticky
STICKY(7) BSD Miscellaneous Information Manual STICKY(7)NAME
sticky -- sticky text and append-only directories
DESCRIPTION
A special file mode, called the sticky bit (mode S_ISTXT), is used to indicate special treatment for directories. It is ignored for regular
files. See chmod(2) or the file <sys/stat.h> for an explanation of file modes.
STICKY DIRECTORIES
A directory whose `sticky bit' is set becomes an append-only directory, or, more accurately, a directory in which the deletion of files is
restricted. A file in a sticky directory may only be removed or renamed by a user if the user has write permission for the directory and the
user is the owner of the file, the owner of the directory, or the super-user. This feature is usefully applied to directories such as /tmp
which must be publicly writable but should deny users the license to arbitrarily delete or rename each others' files.
Any user may create a sticky directory. See chmod(1) for details about modifying file modes.
HISTORY
A sticky command appeared in Version 32V AT&T UNIX.
BUGS
Neither open(2) nor mkdir(2) will create a file with the sticky bit set.
BSD June 5, 1993 BSD