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umask Command Guide: Setting Default Permissions for Newly Created Files/Directories
`umask` command (user file-creation mode mask) is used in Linux and Unix-like operating systems to control the default access permissions for newly created files and directories. It plays an important role in enhancing security by setting a permission restriction mask that is automatically applied when files are created, preventing files from being created with unnecessarily broad permissions. Through this guide, you will learn the concept and usage of `umask`.
Guide to the whereis Command: Finding the Location of Commands/Files
`whereis` command is used in Linux and Unix-like operating systems to locate the binary, source code, and manual page files of a command. It is useful when you need to quickly determine the path of a specific program or file installed on the system, especially when checking the existence of a program in shell scripts or dynamically referencing paths. Through this guide, learn how to use the `whereis` command and its main options.
Guide to the 'which' Command: Finding the Location of Executable Commands
The `which` command is used in Linux and Unix-like operating systems to locate the executable file associated with a given command in the directories listed in the `PATH` environment variable, essentially determining which command will be executed. It is very useful for checking the existence of programs in shell scripts or for figuring out which version of a program with the same name will be executed. Through this guide, you will learn how to use the `which` command and its main options.