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How to Return a String from Bash Functions
https://linuxhint.com/return-string-bash-functions/
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Shell是一种脚本语言,那么,就必须有解释器来执行这些脚本。
Unix/Linux上常见的Shell脚本解释器有bash、sh、csh、ksh等,习惯上把它们称作一种Shell。我们常说有多少种Shell,其实说的是Shell脚本解释器。
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