cleanup structure

examples/02_quick_comparison.luash

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+#!/usr/bin/env luash
+-- Quick Examples: Bite-sized demos showing luash vs bash
+
+print("=== Luash vs Bash: Quick Examples ===\n")
+
+print("1. Environment Variables")
+print("   Bash: echo $USER")
+print("   Luash: print($USER)")
+print("   → " .. $USER)
+
+print("\n2. Variable Assignment")
+print("   Bash: MY_VAR=\"hello\"")
+print("   Luash: $MY_VAR = \"hello\"")
+$MY_VAR = "hello"
+print("   → " .. $MY_VAR)
+
+print("\n3. Command Substitution")
+print("   Bash: current_dir=$(pwd)")
+print("   Luash: current_dir = `pwd`")
+current_dir = `pwd`
+print("   → " .. current_dir)
+
+print("\n4. Conditional Logic")
+print("   Bash: if [ -f \"README.md\" ]; then echo \"exists\"; fi")
+print("   Luash: if `test -f README.md` == \"\" then print(\"missing\") else print(\"exists\") end")
+if `test -f README.md && echo "yes"` == "yes" then
+    print("   → exists")
+else
+    print("   → missing")
+end
+
+print("\n5. Loops with Arrays")
+print("   Bash: for file in *.lua; do echo $file; done")
+print("   Luash: files = `ls *.lua`; for file in files:gmatch(\"[^\\n]+\") do print(file) end")
+files = `ls *.luash`
+print("   → Files found:")
+for file in files:gmatch("[^\n]+") do
+    print("     " .. file)
+end
+
+print("\n6. String Processing")
+print("   Bash: echo \"hello world\" | tr '[:lower:]' '[:upper:]'")
+print("   Luash: string.upper(\"hello world\")")
+print("   → " .. string.upper("hello world"))
+
+print("\n7. Math Operations")
+print("   Bash: result=$((5 + 3))")
+print("   Luash: result = 5 + 3")
+result = 5 + 3
+print("   → " .. result)
+
+print("\n8. File Operations")
+print("   Bash: cat file.txt | wc -l")
+print("   Luash: line_count = `cat luash | wc -l`")
+line_count = `cat luash | wc -l`
+print("   → " .. line_count .. " lines in luash script")
+
+print("\n9. Error Handling")
+print("   Bash: command || echo \"failed\"")
+print("   Luash: if `command 2>/dev/null` == \"\" then print(\"failed\") end")
+if `nonexistent_command 2>/dev/null` == "" then
+    print("   → command failed (as expected)")
+end
+
+print("\n10. Complex Data Structures")
+print("   Bash: (limited array support)")
+print("   Luash: Full Lua tables!")
+data = {
+    users = {"alice", "bob", "charlie"},
+    scores = {alice = 95, bob = 87, charlie = 92}
+}
+print("   → Users: " .. table.concat(data.users, ", "))
+print("   → Alice's score: " .. data.scores.alice)
+
+print("\n✨ Luash combines the best of shell scripting with Lua's power!")