Update cheatsheets

singularity

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# singularity
+
+> Manage Singularity containers and images.
+> More information: <https://singularity-docs.readthedocs.io/en/latest/#commands>.
+
+- Download a remote image from Sylabs Cloud:
+
+`singularity pull --name {{image.sif}} {{library://godlovedc/funny/lolcow:latest}}`
+
+- Rebuild a remote image using the latest Singularity image format:
+
+`singularity build {{image.sif}} {{docker://godlovedc/lolcow}}`
+
+- Start a container from an image and get a shell inside it:
+
+`singularity shell {{image.sif}}`
+
+- Start a container from an image and run a command:
+
+`singularity exec {{image.sif}} {{command}}`
+
+- Start a container from an image and execute the internal runscript:
+
+`singularity run {{image.sif}}`
+
+- Build a singularity image from a recipe file:
+
+`sudo singularity build {{image.sif}} {{recipe}}`