svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.
umask(1)
umask(1) User Commands umask(1)
NAME
umask - get or set the file mode creation mask
SYNOPSIS
/usr/bin/umask [-S] [mask]
sh
umask [ooo]
csh
umask [ooo]
ksh88
umask [-S] [mask]
ksh
umask [-S] [mask]
DESCRIPTION
The umask utility sets the file mode creation mask of the current shell
execution environment to the value specified by the mask operand. This
mask affects the initial value of the file permission bits of subse‐
quently created files. If umask is called in a subshell or separate
utility execution environment, such as one of the following:
(umask 002)
nohup umask ...
find . -exec umask ...
it does not affect the file mode creation mask of the caller's environ‐
ment. For this reason, the /usr/bin/umask utility cannot be used to
change the umask in an ongoing session. Its usefulness is limited to
checking the caller's umask. To change the umask of an ongoing session
you must use one of the shell builtins.
If the mask operand is not specified, the umask utility writes the
value of the invoking process's file mode creation mask to standard
output.
sh
The user file-creation mode mask is set to ooo. The three octal digits
refer to read/write/execute permissions for owner, group, and other,
respectively (see chmod(1), chmod(2), and umask(2)). The value of each
specified digit is subtracted from the corresponding "digit" specified
by the system for the creation of a file (see creat(2)). For example,
umask 022 removes write permission for group and other. Files (and
directories) normally created with mode 777 become mode 755. Files (and
directories) created with mode 666 become mode 644).
o If ooo is omitted, the current value of the mask is printed.
o umask is recognized and executed by the shell.
o umask can be included in the user's .profile (see pro‐
file(5)) and invoked at login to automatically set the
user's permissions on files or directories created.
csh
See the description above for the Bourne shell (sh)umask built-in.
ksh88
The user file-creation mask is set to mask. mask can either be an octal
number or a symbolic value as described in chmod(1). If a symbolic
value is given, the new umask value is the complement of the result of
applying mask to the complement of the previous umask value. If mask is
omitted, the current value of the mask is printed.
ksh
umask sets the file creation mask of the current shell execution envi‐
ronment to the value specified by the mask operand. This mask affects
the file permission bits of subsequently created files. mask can either
be an octal number or a symbolic value as described in chmod(1). If a
symbolic value is specified, the new file creation mask is the comple‐
ment of the result of applying mask to the complement of the current
file creation mask. If mask is not specified, umask writes the value of
the file creation mask for the current process to standard output.
OPTIONS
ksh88
The following option is supported for /usr/bin/umask and umask in
ksh88:
-S Produces symbolic output.
The default output style is unspecified, but will be recognized on a
subsequent invocation of umask on the same system as a mask operand to
restore the previous file mode creation mask.
ksh
The following option is supported in ksh:
-S Causes the file creation mask to be written or treated as a sym‐
bolic value rather than an octal number.
OPERANDS
The following operand is supported:
mask A string specifying the new file mode creation mask. The string
is treated in the same way as the mode operand described in the
chmod(1) manual page.
For a symbolic_mode value, the new value of the file mode cre‐
ation mask is the logical complement of the file permission
bits portion of the file mode specified by the symbolic_mode
string.
In a symbolic_mode value, the permissions op characters + and −
are interpreted relative to the current file mode creation
mask. + causes the bits for the indicated permissions to be
cleared in the mask. − causes the bits of the indicated permis‐
sions to be set in the mask.
The interpretation of mode values that specify file mode bits
other than the file permission bits is unspecified.
The file mode creation mask is set to the resulting numeric
value.
The default output of a prior invocation of umask on the same
system with no operand will also be recognized as a mask oper‐
and. The use of an operand obtained in this way is not obsoles‐
cent, even if it is an octal number.
OUTPUT
When the mask operand is not specified, the umask utility will write a
message to standard output that can later be used as a umask mask op‐
erand.
If -S is specified, the message will be in the following format:
"u=%s,g=%s,o=%s\n", owner permissions, group permissions, \
other permissions
where the three values will be combinations of letters from the set {r,
w, x}. The presence of a letter will indicate that the corresponding
bit is clear in the file mode creation mask.
If a mask operand is specified, there will be no output written to
standard output.
EXAMPLES
Example 1 Using the umask Command
The examples in this section refer to the /usr/bin/umask utility and
the ksh88 umask builtin.
Either of the commands:
umask a=rx,ug+w
umask 002
sets the mode mask so that subsequently created files have their
S_IWOTH bit cleared.
After setting the mode mask with either of the above commands, the
umask command can be used to write the current value of the mode mask:
example$ umask
0002
The output format is unspecified, but historical implementations use
the obsolescent octal integer mode format.
example$ umask -S
u=rwx,g=rwx,o=rx
Either of these outputs can be used as the mask operand to a subsequent
invocation of the umask utility.
Assuming the mode mask is set as above, the command:
umask g-w
sets the mode mask so that subsequently created files have their
S_IWGRP and S_IWOTH bits cleared.
The command:
umask --w
sets the mode mask so that subsequently created files have all their
write bits cleared. Notice that mask operands r, w, x, or anything
beginning with a hyphen (−), must be preceded by - to keep it from
being interpreted as an option.
ENVIRONMENT VARIABLES
See environ(7) for descriptions of the following environment variables
that affect the execution of umask: LANG, LC_ALL, LC_COLLATELC_CTYPE,
LC_MESSAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 The file mode creation mask was successfully changed, or no mask
operand was supplied.
>0 An error occurred.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
/usr/bin/umask, csh, ksh88, sh
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/core-os _ Interface StabilityCommit‐
ted _ StandardSee standards(7).
ksh
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitysystem/core-os _ Interface Stabili‐
tyVolatile
SEE ALSO
chmod(1), csh(1), ksh(1), ksh88(1), sh(1), chmod(2), creat(2),
umask(2), profile(5), attributes(7), environ(7), standards(7)
Oracle Solaris 11.4 12 Jul 2011 umask(1)