ipcmk:tldr:507bd

This command is used to create a shared memory segment using the "ipcmk" utility.

• "ipcmk" is a command-line utility that is typically found in Unix-like operating systems, such as Linux. It is used to create and manage inter-process communication (IPC) resources, including shared memory segments.

• "--shmem" is a flag or option provided to the "ipcmk" utility, indicating that a shared memory segment needs to be created.

• "${segment_size_in_bytes}" is a placeholder for the desired size of the shared memory segment, specified in bytes. You need to replace it with the actual size you want for your shared memory segment.

• "${octal_permissions}" is another placeholder, which represents the octal permissions for the shared memory segment. Octal permissions are a way to specify access permissions using three digits, each ranging from 0 to 7 (inclusive). The first digit represents permissions for the owner, the second digit represents permissions for the group, and the third digit represents permissions for others. You need to replace it with the actual octal permissions you want to assign to the shared memory segment.

To use this command, you would replace "${segment_size_in_bytes}" with the desired size of the shared memory segment (e.g., 1024 for 1KB), and replace "${octal_permissions}" with the desired octal permissions (e.g., 666 for read and write permissions for all users).