| bc | POSIX.2 | XPG4.2 | Use the arbitrary-precision arithmetic calculation language |
| break | POSIX.2 | XPG4.2 | Exit from a for, while, or until loop in a shell script |
| colon or : | POSIX.2 | XPG4.2 | Do nothing, successfully |
| continue | POSIX.2 | XPG4.2 | Skip to the next iteration of a loop in a shell script |
| dot or . | POSIX.2 | XPG4.2 | Run a shell file in the current environment |
| eval | POSIX.2 | XPG4.2 | Construct a command by concatenating arguments |
| exec | POSIX.2 | XPG4.2 | Run a command and open, close, or copy the file descriptors |
| exit | POSIX.2 | XPG4.2 | Return to the parent process from which the shell was called or to TSO/E |
| expr | POSIX.2 | XPG4.2 | Evaluate arguments as an expression |
| false | POSIX.2 | XPG4.2 | Return a nonzero exit code |
| grep | POSIX.2 | XPG4.2 | Search a file for a specified pattern |
| left bracket or [ | — | XPG4.2 | Test for a condition |
| let | — | — | Evaluate an arithmetic expression |
| test | POSIX.2 | XPG4.2 | Test for a condition |
| trap | POSIX.2 | XPG4.2 | Intercept abnormal conditions and interrupts |
| true | POSIX.2 | XPG4.2 | Return a value of 0 |