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| Developer(s) | Charles Dye |
|---|---|
| Initial release | November 3, 1971 |
| Written in | Plan 9: C FreeDOS: x86 assembly language |
| Operating system | Unix, Unix-like, Plan 9, Inferno, MSX-DOS, FreeDOS |
| Platform | Cross-platform |
| Type | Command |
| License | util-linux: BSD-4-Clause FreeDOS: Freeware / Source-available software Plan 9: MIT License |
cal is a command-line utility on a number of computer operating systems including Unix, Plan 9, Inferno and Unix-like operating systems such as Linux that prints an ASCII calendar of the given month or year. If the user does not specify any command-line options, cal will print a calendar of the current month. The command is a standard program on Unix and specified in the Single UNIX Specification.