UMASK(2) Linux Programmer's Manual UMASK(2)NAME
umask - set file creation mask
SYNOPSIS
#include <sys/types.h>
#include <sys/stat.h>
mode_t umask(mode_t mask);
DESCRIPTION
umask sets the umask to mask & 0777.
The umask is used by open(2) to set initial file permissions on a newly-created file. Specifically, permissions in the umask are turned
off from the mode argument to open(2) (so, for example, the common umask default value of 022 results in new files being created with per-
missions 0666 & ~022 = 0644 = rw-r--r-- in the usual case where the mode is specified as 0666).
RETURN VALUE
This system call always succeeds and the previous value of the mask is returned.
CONFORMING TO
SVr4, SVID, POSIX, X/OPEN, BSD 4.3
SEE ALSO creat(2), open(2)Linux 1998-08-09 UMASK(2)
Check Out this Related Man Page
UMASK(2) Linux Programmer's Manual UMASK(2)NAME
umask - set file mode creation mask
SYNOPSIS
#include <sys/types.h>
#include <sys/stat.h>
mode_t umask(mode_t mask);
DESCRIPTION
umask() sets the calling process's file mode creation mask (umask) to mask & 0777 (i.e., only the file permission bits of mask are used),
and returns the previous value of the mask.
The umask is used by open(2), mkdir(2), and other system calls that create files to modify the permissions placed on newly created files or
directories. Specifically, permissions in the umask are turned off from the mode argument to open(2) and mkdir(2).
The constants that should be used to specify mask are described under stat(2).
The typical default value for the process umask is S_IWGRP | S_IWOTH (octal 022). In the usual case where the mode argument to open(2) is
specified as:
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH
(octal 0666) when creating a new file, the permissions on the resulting file will be:
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH
(because 0666 & ~022 = 0644; i.e., rw-r--r--).
RETURN VALUE
This system call always succeeds and the previous value of the mask is returned.
CONFORMING TO
SVr4, 4.3BSD, POSIX.1-2001.
NOTES
A child process created via fork(2) inherits its parent's umask. The umask is left unchanged by execve(2).
The umask setting also affects the permissions assigned to POSIX IPC objects (mq_open(3), sem_open(3), shm_open(3)), FIFOs (mkfifo(3)), and
Unix domain sockets (unix(7)) created by the process. The umask does not affect the permissions assigned to System V IPC objects created
by the process (using msgget(2), semget(2), shmget(2)).
SEE ALSO chmod(2), mkdir(2), open(2), stat(2)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-01-09 UMASK(2)
Hi!
My question is this:
Is it possible to change the default permissions in UNIX (666 for files and 777 for directories)?.
I am not talking about using the command "umask".
I mean, with the command "umask" you can modify permissions from a default permissions x. Is it possible to make... (4 Replies)
Hi,
Will umask work with find command ?
I was trying to do
find /newdir/apps/ -type d -name 'par' -print -exec umask 117 {} \;
it returns with
find: umask: Permission denied ,
I've checked permission of all the directores, they have 770.
however, If I use the command
find... (4 Replies)
Hi All,
in my HP-UX 11.11 , there is an parameter of SFTP_UMASK at env,
but How do we use it ?
I tried with type : SFTP_UMASK=022
and when I type : env
the SFTP_UMASK value has changed to 022 .
but when I send a file with use SFTP from other pc/server .
It still umask 077 (chmod... (4 Replies)
hai guys ,
i am having problem in getting the knowledge about umask.
actually when i am putting command as umask some value is coming like 0022 by defalut.
we can change its value also.
but the main thing is thye file permisiion actually depends upon umask.how is it depends upon umask i want to... (6 Replies)
Due to urgent requirement to resolve some permission issues , I wish
to set solaris 8 server so that any file written is on 777 .
I guess need to set umask , how to set it ?? (7 Replies)
Hi,
Please, let me know how the umask is working? As per my understanding is aprt from subtracting from 666/777, logical gate operation is performing.
Ex: If I set uname 011, it gave the permission like 666 for file. Request you to explain which gate's operation performed.
$uname 011... (4 Replies)
Hi all,
How do i change the default primary group of files uploaded in AIX (via ftp) in such a way that the files will be owned by tom:staff?
I understand that the default file permission can be set in /etc/profile for aix by adding a new line umask=032
Do I add a line in umask as well?... (5 Replies)
Hi ,
i am facing small issue if anybody help appreciated.
how can we give the default permissions as 777 for files by using umask command..
advance thank you..
regards
rajesh:wall: (5 Replies)
Introduction
I have seen some misinformation regarding Unix file permissions. I will try to set the record straight. Take a look at this example of some output from ls:
$ ls -ld /usr/bin /usr/bin/cat
drwxrwxr-x 3 root bin 8704 Sep 23 2004 /usr/bin
-r-xr-xr-x 1 bin bin ... (6 Replies)
Hey Guys,
First post here. I just started learning UNIX a few weeks ago.
My issue: I use FreeNAS which is based off of UNIX in my network environment which hosts files that my team needs to access. Each user has their own login but we are all part of a group called "ITLIC".
I have a share... (15 Replies)
Hi,
I'm aware that this question has been raised earlier and the solution provided has not helped me. So, the issue is that I'm trying to set a defumask to files transferred via ftp to be 002 so that the group may have write permissions to the files uploaded. We have local/system users... (5 Replies)
i need my script1.sh to generate /tmp/temp.txt with full permissions i.e
-rwxrwxrwx 1 user1 users 23 Dec 16 10:52 /tmp/temp.txtmore script1.sh
umask 666
echo "hello">/tmp/temp.txt
But the script1.sh generates temp.txt with different permissions as shown below.
-rwxr-xr-x 1 user1 users... (6 Replies)
Hi All
please help in this ..
I have application user called: startsys
umask already defined in the profile of application user as umask 033.
Actually application creating files once the file getting create it created with different permission which is not the same of the defined... (8 Replies)