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如何更改自己创建的文件的默认权限？

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如何更改自己创建的文件的默认权限？ 
[root@ test_project]$ touch test.txt
[root@ test_project]$ ll test.txt
-rw-rw-r-- 1 root root  0 2011-08-03 13:57 test.txt

目前看来是这样的664，我该如何改变它700？

答案1

您可以使用umask命令来更改文件创建掩码。但这只会屏蔽位。如果创建文件的应用程序不请求设置位，则 umask 将不会设置它。然后umask 077通常会创建文件600和目录700

您可以在 $HOME/.profile 中设置默认的 umask

答案2

你想使用umask

sente@oslo: $ umask
0022
sente@oslo: $ umask -S
u=rwx,g=rx,o=rx

sente@oslo: $ touch foo
sente@oslo: $ ls -l foo
-rw-r--r-- 1 sente pg2662512 0 2011-08-02 23:13 foo

sente@oslo: $ umask -S u=rwx,g=,o=
u=rwx,g=,o=

sente@oslo: $ touch bar
sente@oslo: $ ls -l bar
-rw------- 1 sente pg2662512 0 2011-08-02 23:13 bar

我认为您仍然需要 chmod u+x。

sente@oslo: $ help umask：

umask: umask [-p] [-S] [mode]
    The user file-creation mask is set to MODE.  If MODE is omitted, or if
    `-S' is supplied, the current value of the mask is printed.  The `-S'
    option makes the output symbolic; otherwise an octal number is output.
    If `-p' is supplied, and MODE is omitted, the output is in a form
    that may be used as input.  If MODE begins with a digit, it is
    interpreted as an octal number, otherwise it is a symbolic mode string
    like that accepted by chmod(1).

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