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並前往https://unix.stackexchange.com/questions/165358/strange-leading-whitespace-in-optarg-when-using-getopts

Strange leading whitespace in OPTARG when using getopts

You should just leave out the double quotes around "-n -1" , as that is what preserves the space before the 1 : OPTIND=1 && getopts ":n:" opt -n 1 && echo ...

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