Update cheatsheets

tldr/linux/apptainer-exec

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# apptainer exec
+
+> Execute a command within an Apptainer container.
+> See also: `apptainer run`, `apptainer shell`.
+> More information: <https://apptainer.org/docs/user/main/cli/apptainer_exec.html>.
+
+- Execute a command inside a container:
+
+`apptainer exec {{path/to/image.sif}} {{command}}`
+
+- Execute a command with arguments:
+
+`apptainer exec {{path/to/image.sif}} {{command}} {{arg1 arg2 ...}}`
+
+- Execute a command with a bind mount from host to container:
+
+`apptainer exec {{[-B|--bind]}} {{path/to/source}}:{{path/to/destination}} {{path/to/image.sif}} {{command}}`
+
+- Execute a command with environment variables:
+
+`apptainer exec --env {{variable}}={{value}} {{path/to/image.sif}} {{command}}`
+
+- Execute a command in fully isolated mode (contained filesystem, PID, IPC, and clean environment):
+
+`apptainer exec {{[-C|--containall]}} {{path/to/image.sif}} {{command}}`
+
+- Execute a command with a writable temporary filesystem overlay:
+
+`apptainer exec --writable-tmpfs {{path/to/image.sif}} {{command}}`
+
+- Execute a command with NVIDIA GPU support:
+
+`apptainer exec --nv {{path/to/image.sif}} {{command}}`
+
+- Display help:
+
+`apptainer exec {{[-h|--help]}}`