Fmask
Encyclopedia
Fmask is a unix
command.
The following is copy pasted from man mount.
umask=value
Set the umask (the bitmask of the permissions that are not
present). The default is the umask of the current process. The
value is given in octal.
dmask=value
Set the umask applied to directories only. The default is the
umask of the current process. The value is given in octal.
fmask=value
Set the umask applied to regular files only. The default is the
umask of the current process. The value is given in octal.
# /etc/fstab: static file system information.
#
/dev/hda1 /media/win ntfs rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46 0 1
/dev/hda2 /media/big vfat rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46,utf8 0 1
/dev/hdb1 /media/old vfat rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46,utf8 0 1
Unix
Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...
command.
The following is copy pasted from man mount.
umask=value
Set the umask (the bitmask of the permissions that are not
present). The default is the umask of the current process. The
value is given in octal.
dmask=value
Set the umask applied to directories only. The default is the
umask of the current process. The value is given in octal.
fmask=value
Set the umask applied to regular files only. The default is the
umask of the current process. The value is given in octal.
Examples
The following is an example of a user's /etc/fstab file.# /etc/fstab: static file system information.
#
/dev/hda1 /media/win ntfs rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46 0 1
/dev/hda2 /media/big vfat rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46,utf8 0 1
/dev/hdb1 /media/old vfat rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46,utf8 0 1
Directories (ie dmask=002)
| Owner | Group | Other | ||
|---|---|---|---|---|
| Directories have attributes | r w x | r w x | r w x | |
| Permissions preset | 1 1 1 | 1 1 1 | 1 1 1 | (7778) |
| dmask (do NOT pass preset bit(s)) | 0 0 0 | 0 0 0 | 0 1 0 | (0028) |
| ------- | ------- | ------- | ||
| Result | 1 1 1 | 1 1 1 | 1 0 1 | (7758) |
| For Directories | r w x | r w x | r - x |
Files (ie: fmask=113)
| Owner | Group | Other | |||
|---|---|---|---|---|---|
| Files have attributes | r w x | r w x | r w x | ||
| Permissions preset | 1 1 1 | 1 1 1 | 1 1 1 | (7778) | (6668) for some systems |
| fmask (do NOT pass preset bit(s)) | 0 0 1 | 0 0 1 | 0 1 1 | (1138) | |
| ------- | ------- | ------- | |||
| Result | 1 1 0 | 1 1 0 | 1 0 0 | (6648) | |
| For Files | r w - | r w - | r - - |
Both Files and Directories (ie: umask=003)
| Owner | Group | Other | ||
|---|---|---|---|---|
| Files & Directories have attributes | r w x | r w x | r w x | |
| Permissions preset | 1 1 1 | 1 1 1 | 1 1 1 | (7778) |
| umask (do NOT pass preset bit(s)) | 0 0 0 | 0 0 0 | 0 1 1 | (0038) |
| ------- | ------- | ------- | ||
| Result | 1 1 1 | 1 1 1 | 1 0 0 | (7748) |
| For Files or Directories | r w x | r w x | r - - |