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Question
In regular expressions, using grep, search for all the lines that end with the word "hack" (may be followed by some whitespace), in file test.txt?
Answer
grep 'hack *$' test.txt
^^ note the use of $, also note the " *" do count for whitespace

Question
In regular expressions, using grep, search for all the lines that end with the word "hack" (may be followed by some whitespace), in file test.txt?
Answer
?

Question
In regular expressions, using grep, search for all the lines that end with the word "hack" (may be followed by some whitespace), in file test.txt?
Answer
grep 'hack *$' test.txt
^^ note the use of $, also note the " *" do count for whitespace
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5. Regular Expressions
begins or ends with a certain string. The ^ character specifies the beginning of a line, and the $ character the end of the line. For example, ^The matches all lines that start with a The , and <span>hack$ matches all lines that end with hack , and '^ *The.*hack *$' matches all lines that begin with The and end with hack , even if there is whitespace at the beginning or end of the line. B

Summary

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

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