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Computer Science Fundamentals Questions

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How many number of errors in this shell script echo How are you? read $answer
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Why lex is used
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Which of the following programs are not interactive?
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Which command is used to display the top of the file?
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Which command is used to sort the lines of data in a file in reverse order
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Which symbol will be used with grep command to match the pattern pat at the beginning of a line?
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Which command sends the word count of the file infile to the newfile.
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Which command is used to extract specific columns from the file?
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Which of the following keys is used to replace a single character with new text?
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Which command is used to remove a directory?
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Which of the following is not a communication command.
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If you are to use [Control-c] as the interrupt key instead of [Del], then you will have to use
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