Builtins

• echo with option -n
• cd with only a relative or absolute path
• pwd with no options
• export with no options
• unset with no options
• env with no options or arguments
• exit with no options

Export

• name
  • Consisting solely of letters, numbers, and underscores, and beginning with a letter or underscore. Names are used as shell variable.

Unset

• name
  • Consisting solely of letters, numbers, and underscores, and beginning with a letter or underscore. Names are used as shell variable.