umask
umask is a Linux command in the Permissions category, rated intermediate difficulty. Sets the default permission mask for newly created files and directories. The syntax is umask [mode]. Key options and parameters: mode — octal mask value. It returns current mask if no argument. A practical example: umask # Show current mask umask 022 # Default: 755 for dirs, 644 for files umask 077 # Restrictive: only owner has access A close relative is chmod, which changes file permissions (read, write, execute) for owner/group/others. A close relative is chown, which changes file owner and/or group ownership. A close relative is chgrp, which changes group ownership of files and directories. More about this category: Linux permission commands — chmod, chown, chgrp, umask, and more. Manage file permissions and ownership. Related Permissions commands: chmod, chown, chgrp, sudo, su, getfacl, setfacl, chattr.