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  • bash - Optional option argument with getopts - Stack Overflow
    How I do make an option optional? 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 case $arg in ( ) R) # Check next positional parameter eval nextopt=\${$OPTIND} # existing or starting with dash?
  • bash - How to make getopts parameter optional - Super User
    In addition to -h for printing the output, it takes one other option: -b with (what is intended to be) an optional parameter to set the offset in hours So -b 5 logs a new pack of cigs bought 5 hours ago, and subsequent runs of cigs sh indicate how many weeks, days or hours it's been since then
  • Help with optional arguments : r bash - Reddit
    getopt (not get getopts) can take arguments But I haven't figured out how to make the arguments optional If an option has no argument you'll get the following error: getopt: option '--padding' requires an argument Try this:
  • How can I handle command-line options and arguments in my . . .
    In all cases, option processing involves writing a loop Ideally, this loop will make one pass over the argument list, examining each argument in turn, and setting appropriate shell variables so that the script remembers which options are in effect
  • Using getopts to process long and short command line options
    You can accept optional arguments to long options!--charlie omits needs_arg and assigns to ${OPTARG:-$charlie_default}, which uses $charlie_default when $OPTARG is empty (getopts can't allow an optional argument for -c and therefore prohibits it ) The case then matches either short or long options (the pipe, |, indicates that "or" operation
  • Mandatory arguments with getopts? - LinuxQuestions. org
    Firstly, according to the code getopts argument list (:s:dvu:p:n:), -s, -u, -p, and -n take a mandatory argument In the case statement, the code assigns the value of OPTARG to b and c, even though these options are set to not recieve an argument





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