[ 源代码： opt ]
软件包：opt（3.19-1.3 以及其他的）
Options Parsing Tool library
opt is a subroutine library which facilitates the convenient input of parameters to a C program. Parameters are parsed from a command line, with further facilities for reading options from files, from environment strings, or from an interactive environment. The aim of the opt package is to permit programs to be both user- and programmer- friendly. The package attempts to on the one hand provide a direct and relatively full-featured input interface to the ultimate user of the program, and at the same time impose a minimal amount of work on the programmer to "attach" the package to his or her software. It is similar to GNU's (and AT&T's old) getopts package, but with a different interface that might be easier to use.