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- Viewed 37k times21edited May 23, 2017 at 12:40
Assume the default mask of 0666. umask 0022 would make the new mask 0644 (0666-0022=0644) meaning that group and others have read (no write or execute) permissions.
The "extra" digit (the first number = 0), specifies that there are no special modes.
If mode begins with a digit it will be interpreted as octal otherwise its meant to be symbolic.
0 is ...
4000 = SUID2000 = SGID1000 = sticky bitThe SUID bit, short for set-user-ID, causes an executable program to run with the effective user id (uid) of the owner -- in other words, no matter who executes ...
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WEBFeb 23, 2021 · To calculate the umask value, simply subtract the desired permissions from the default one: Umask value: 777-750 = 027. The desired umask value represented in numeric notation is 027. To …
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WEBJul 28, 2022 · Linux allows some processes to inherit system umask values, or to be given their own umask settings. For example, useradd uses a umask setting to create new users' home directories. A umask …
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WEBApr 2, 2024 · But, how do I calculate umask value under Linux? The octal umasks are calculated via the bitwise AND of the unary complement of the argument using bitwise NOT. The octal notations are as follows:
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WEBTo calculate the umask value simply subtract the desired permissions from the default one: Umask value: 777-750 = 027. The desired umask value represented in numeric notation is 027. To permanently set the new …
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