getopt() is actually a really simple function. I made a github gist for it, code from here is below too #include <string.h> #include <stdio.h> int opterr = 1, /* if error message should be printed */ optind = 1, /* index into parent argv vector */ optopt, /* character checked for validity */ optreset; /* … Read more
Although not mentioned in glibc documentation or getopt man page, optional arguments to long style command line parameters require ‘equals sign’ (=). Space separating the optional argument from the parameter does not work. An example run with the test code: $ ./respond –praise John Kudos to John $ ./respond –praise=John Kudos to John $ ./respond … Read more
This workaround defines ‘R’ with no argument (no ‘:’), tests for any argument after the ‘-R’ (manage last option on the command line) and tests if an existing argument starts with a dash. # No : after R while getopts “hd:R” arg; do case $arg in (…) R) # Check next positional parameter eval nextopt=\${$OPTIND} … Read more
As of python 2.7, optparse is deprecated, and will hopefully go away in the future. argparse is better for all the reasons listed on its original page (https://code.google.com/archive/p/argparse/): handling positional arguments supporting sub-commands allowing alternative option prefixes like + and / handling zero-or-more and one-or-more style arguments producing more informative usage messages providing a much … Read more
getopt and getopts are different beasts, and people seem to have a bit of misunderstanding of what they do. getopts is a built-in command to bash to process command-line options in a loop and assign each found option and value in turn to built-in variables, so you can further process them. getopt, however, is an … Read more