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You are to write a program that will repeatedly do the following things, repeatedly: 1. Read a command line from the standard input (file descriptor 0). At the end of the file (that is, when the read system call returns 0), just quit (using the exit system call). 2. If the line just read contains only blanks and tab characters, ignore it (it contains no simple-command in this case), and return to step 1.

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You are to write a program that will repeatedly do the following things, repeatedly: 1. Read a comma...
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