diff --git a/pages/linux/compgen.md b/pages/linux/compgen.md
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+# compgen
+
+> A built-in command for auto-completion in bash, which is called on pressing TAB key twice.
+
+- List all commands that you could run:
+
+`compgen -c`
+
+- List all aliases:
+
+`compgen -a`
+
+- List all functions that you could run:
+
+`compgen -A function`
+
+- Show shell reserved key words:
+
+`compgen -k`
+
+- See all available commands/aliases starting with 'ls':
+
+`compgen -ac {{ls}}`
diff --git a/pages/osx/compgen.md b/pages/osx/compgen.md
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+++ b/pages/osx/compgen.md
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+# compgen
+
+> A built-in command for auto-completion in bash, which is called on pressing TAB key twice.
+
+- List all commands that you could run:
+
+`compgen -c`
+
+- List all aliases:
+
+`compgen -a`
+
+- List all functions that you could run:
+
+`compgen -A function`
+
+- Show shell reserved key words:
+
+`compgen -k`
+
+- See all available commands/aliases starting with 'ls':
+
+`compgen -ac {{ls}}`