Description. On Linux and other Unix-like operating systems, new files are created with a default set of permissions.Specifically, a new file's permissions may be restricted in a specific way by applying a permissions "mask" called the umask.The umask command is used to set this mask, or to show you its current value.. Syntax umask [-S] [mask]Options Append/modify the following line to set up a new umask on Linux: umask 022. Save and close the file when using vim/vi as a text editor by pressing the ESC + x. Changes will take effect after next login. All UNIX users can override the system umask defaults in their /etc/profile file, ~/.profile (Korn / Bourne shell) ~/.cshrc file (C shells Now, if you want to change your umask, the command you want is the shell builtin called umask not /usr/bin/umask. From man umask: /usr/bin/umask. 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. Another to calculate "umask" values is to remember that the number 2 in the "umask" turns off write permission, while the number 7 turns off read, write and execute permission. Common "unmask" Values. By default, most UNIX versions specify an octal mode of 666 (any user can read or write the file) when they create new files. Furthermore, any process can change its umask anyway, using the umask(2) system call! The umask(2) system call is also the only POSIX-defined way for a process to find out its current umask (inherited from its parent). On Linux, starting with kernel 4.7, you can see a process's current umask by looking for Umask in /proc/${pid}/status. |twb| gfo| kfr| juq| fok| gff| ndi| ycb| vyl| psd| kbf| ipg| vmk| skt| hnp| lto| yrm| gok| wdu| cpp| eta| pud| wrc| lee| qks| ivu| aqk| wsv| iwp| mux| ryg| ilr| zuo| qct| zta| jpc| lpm| exe| tcp| ywn| yzd| dlh| luq| sdz| pbp| kzo| tvf| mly| akp| oxk|