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8 Cards in this Set
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- Back
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awk was the most powerful utility for text manipulation and report writing until the advent of what?
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Perl
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What is the generic syntax for awk?
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awk options 'selection_criteria {action}' file(s)
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What is the purpose of the selection component in awk?
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filters inoput and selects lines for the action component to act on
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How are fields in awk numbered?
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$1, $2, and so on
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How does awk address an entire line?
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$0
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If the action component is missing from awk, what is the default action?
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Printing
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What is the difference between print and print $0? Is the print statement necessary for printing a line?
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Both print the entire line. print is not necessary if the selcetion criteria is specified
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Implement the following commands in awk:
(i) head -n 5 (ii) sed -n '5,10p' (iii) tail +20 (iv) grep negroponte |
(i) awk 'NR <=5' foo
(ii) awk 'NR == 5, NR ==10' foo (iii) awk 'NR > 20' foo (iv) awk '/negroponte/' foo |
