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[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

Currently it seems to be 664,how can I change it to 700?

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2 Answers 2

You can use the umask command to change the file creation mask. This though only masks bits. If the application creating the file does not request a bit to be set then umask wont set it. With a umask 077 then files will generally be created 600 and directories 700

You can set your default umask in your $HOME/.profile

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You want to use 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

I think you'll need to chmod u+x still.

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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