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What does getopt stand for?
getopt is a C library function used to parse command-line options of the Unix/POSIX style. It is a part of the POSIX specification, and is universal to Unix-like systems. It is also the name of a Unix program for parsing command line arguments in shell scripts.
What does getopt do in bash?
What is getopt? getopt is used to break up (parse) options in command lines for easy parsing by shell procedures, and to check for legal options. It uses the GNU getopt(3) routines to do this.
What library is getopt in?
The GNU C Library
Getopt (The GNU C Library)
What does getopt getopt return?
Return Value: The getopt() function returns different values: If the option takes a value, that value is pointer to the external variable optarg. ‘-1’ if there are no more options to process. ‘ when there is an unrecognized option and it stores into external variable optopt.
How does the getopts builtin in Linux work?
The getopts builtin (not in tcsh) parses command-line arguments, making it easier to write programs that follow the Linux argument conventions. getopts optstring varname [arg …] and arg is the optional list of parameters to be processed. If arg is not present, getopts processes the command-line arguments.
What’s the difference between getopts and tcsh?
In contrast to getopts, getopt is not built into the shell, it is a standalone program that has been ported to many different Unix and Unix-like distributions. The getopts builtin (not in tcsh) parses command-line arguments, making it easier to write programs that follow the Linux argument conventions.
Are there any arguments against using getopt in Bash?
If it has to be portable to a range of Unices, you’d have to stick to POSIX sh. And AFAIU there you just have no choice but rolling argument handling by hand. getopt vs getopts seems to be a religious issue. As for the arguments against getopt in the Bash FAQ:
When did getopts replace the getopt program?
It originated around 1986, as a replacement for getopt, which was created sometime before 1980. In contrast to getopts, getopt is not built into the shell, it is a standalone program that has been ported to many different Unix and Unix-like distributions.