Test (Unix)
| test | |
|---|---|
| Other names | [ | 
| Developer(s) | Various open-source and commercial developers | 
| Written in | C | 
| Operating system | Unix, Unix-like, Plan 9, IBM i | 
| Platform | Cross-platform | 
| Type | Command | 
| License | coreutils: GPLv3+ Plan 9: MIT License | 
test is a command-line utility found in Unix, Plan 9, and Unix-like operating systems that evaluates conditional expressions. test was turned into a shell builtin command in 1981 with UNIX System III and at the same time made available under the alternate name [.