A simple shell interpreter. Just for learning the details of shell and script interpreter.
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This demo supports for some basic commands. echo ls wc cp mv rm grep sort and expr find basename dirname head tail cat file read
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It also supports for performing background (add a '&' after the command. such as "sort file1 &".Note that & must be after spaces )
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I/O redirect is available. ( > >> <)
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myshell filename # exec the commands in the file.