Special Built-in Utilities

• break - exit from for, while, or until loop (Special Built-in Utility)
• colon - null utility (Special Built-in Utility)
• continue - continue for, while or until loop (Special Built-in Utility)
• dot - execute commands in current environment (Special Built-in Utility)
• eval - construct command by concatenating arguments (Special Built-in Utility)
• exec - execute commands and open, close, or copy file descriptors (Special Built-in Utility)
• exit - cause the shell to exit (Special Built-in Utility)
• export - set export attribute for variables (Special Built-in Utility)
• readonly - set read-only attribute for variables (Special Built-in Utility)
• return - return from a function (Special Built-in Utility)
• set - set or unset options and positional parameters (Special Built-in Utility)
• shift - shift positional parameters (Special Built-in Utility)
• times - write process times (Special Built-in Utility)
• trap - trap signals (Special Built-in Utility)
• unset - unset values and attributes of variables and functions (Special Built-in Utility)