[ - evaluate a conditional expression; synonym for test requiring a closing ].
[ expression ]
[ is a POSIX regular builtin provided by Rush. Evaluate a conditional expression; synonym for test requiring a closing ].
This page summarizes the builtin in Rush documentation. POSIX is the normative reference for detailed portable behavior.
See the POSIX definition for command-specific status rules. Usage errors generally return a non-zero status.
rush-builtins(7), POSIX Shell Command Language.