In Linux, both getopt and getopts are command-line parsing utilities used to process command-line options and arguments. However, they differ in terms of their implementation and functionality.
getopt: The getopt utility is an older and more flexible option parser that is commonly used in shell scripts. It allows you to parse command-line options and arguments in a variety of formats, including both short options (e.g., -a) and long options (e.g., --verbose). getopt is a C library function that can be called from shell scripts using the getopt command or by directly invoking it from a programming language such as C or Python.
getopts: The getopts utility is a simpler option parser designed specifically for use within shell scripts. It only supports short options (single-letter options) and does not handle long options. getopts is a built-in shell command in POSIX-compliant shells, such as Bash.
The getopts command simplifies option parsing by providing a concise syntax and automatic assignment of option values to variables. It is particularly useful for handling simple command-line options and flags. However, it lacks some of the advanced features provided by getopt.