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23 lines
688 B
HTML
23 lines
688 B
HTML
<p>Given a text file <code>file.txt</code> that contains a list of phone numbers (one per line), write a one-liner bash script to print all valid phone numbers.</p>
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<p>You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)</p>
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<p>You may also assume each line in the text file must not contain leading or trailing white spaces.</p>
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<p><strong>Example:</strong></p>
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<p>Assume that <code>file.txt</code> has the following content:</p>
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<pre>
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987-123-4567
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123 456 7890
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(123) 456-7890
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</pre>
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<p>Your script should output the following valid phone numbers:</p>
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<pre>
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987-123-4567
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(123) 456-7890
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</pre>
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