Update cheatsheets

atom

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# atom
+
+> A cross-platform pluggable text editor.
+> Plugins are managed by `apm`.
+> More information: <https://atom.io/>.
+
+- Open a file or directory:
+
+`atom {{path/to/file_or_directory}}`
+
+- Open a file or directory in a [n]ew window:
+
+`atom -n {{path/to/file_or_directory}}`
+
+- Open a file or directory in an existing window:
+
+`atom --add {{path/to/file_or_directory}}`
+
+- Open Atom in safe mode (does not load any additional packages):
+
+`atom --safe`
+
+- Prevent Atom from forking into the background, keeping Atom attached to the terminal:
+
+`atom --foreground`
+
+- Wait for Atom window to close before returning (useful for Git commit editor):
+
+`atom --wait`