Shell 通过 grep 获取json文件中的值

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$ cat config.json
{"robotCode":"HX-00046","robotName":"hx-robot-00046","mallId":200,"mallName":"xxx","buildingId":0,"floorId":7,"mapName":"200_0_7"}

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$ cat config.json | grep -oP '(?<="robotCode":")[^"]*'
HX-00046

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-o --only-matching
    Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line.

-P, --perl-regexp
    Interpret PATTERN as a Perl  regular  expression. This  is  highly  experimental  and  grep  -P  may  warn  of unimplemented features.