Create a shared memory segment with specific permissions (default is 0644)

Create IPC (Inter-process Communication) resources.
More information: <https://manned.org/ipcmk>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

ipcmk --shmem {{segment_size_in_bytes}} {{octal_permissions}}

click the source code to copy install ipcmk on any operating system with command-not-found.com