Update cheatsheets

linux/ipcmk

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ipcmk
+
+> Create IPC (Inter-process Communication) resources.
+> More information: <https://manned.org/ipcmk>.
+
+- Create a shared memory segment:
+
+`ipcmk --shmem {{segment_size_in_bytes}}`
+
+- Create a semaphore:
+
+`ipcmk --semaphore {{element_size}}`
+
+- Create a message queue:
+
+`ipcmk --queue`
+
+- Create a shared memory segment with specific permissions (default is 0644):
+
+`ipcmk --shmem {{segment_size_in_bytes}} {{octal_permissions}}`