===============================
Command
===============================

whoami

---

(source_file
  (command (command_name (identifier))))

===============================
Command without trailing new line
===============================

echo hello
---

(source_file (command (command_name (identifier)) (word)))

===============================
Variable expansion
===============================

cat $FOO

---

(source_file
  (command
    (command_name (identifier))
    (expansion (variable (identifier)))))

===============================
Redirection
===============================

cat file 2> /dev/null
echo message >&2
python <<< 'print("hello")'

---

(source_file
  (command
    (command_name
      (identifier))
    (word)
    (word)
    (redirection
      (word)))
  (command
    (command_name
      (identifier))
    (word)
    (redirection
      (word)))
  (command
    (command_name
      (identifier))
    (redirection
      (raw_string))))

===============================
Pipeline
===============================

cat path/to/file.txt | wc -l

---

(source_file
  (pipeline
    (command
      (command_name
        (identifier))
      (word))
    (command
      (command_name
        (identifier))
      (word))))

===============================
String interpolation
===============================

echo "The result is $result"

---

(source_file
  (command
  (command_name
    (identifier))
  (template_string
    (expansion
      (variable
        (identifier))))))

===============================
Negated command
===============================

! grep foo

---

(source_file
  (command
    (command_name
      (identifier))
    (word)))

===============================
Mix functions and commands
===============================

generate() | cut -d ' ' -f 1

---

(source_file
  (pipeline
    (call_expression
      (identifier)
      (argument_list))
    (command
      (command_name
        (identifier))
          (word)
          (raw_string)
          (word)
          (word))))