Which symbol will be used with grep command to match the pattern pat at the beginning of a line?









unix





    

  1. 

    ^pat
    

    2. 

  2. 

    $pat
    

    3. 

  3. 

    pat$
    

    4. 

  4. 

    pat^
    

    5. 










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Correct Option: A




Explanation:



To match the pattern "pat" at the beginning of a line using the grep command, the symbol ^ will be used.


Now let's go through each option and explain why it is right or wrong:


A. ^pat: This option is correct. The ^ symbol in a regular expression is used to match the pattern at the beginning of a line. Therefore, ^pat will match the pattern "pat" at the beginning of a line.


B. $pat: This option is incorrect. The $ symbol in a regular expression is used to match the pattern at the end of a line. Therefore, $pat will match the pattern "pat" at the end of a line, not at the beginning.


C. pat$: This option is incorrect. The $ symbol in a regular expression is used to match the pattern at the end of a line. Therefore, pat$ will match the pattern "pat" at the end of a line, not at the beginning.


D. pat^: This option is incorrect. The symbol ^ does not have any special meaning when it appears after the pattern. Therefore, pat^ will match the literal string "pat^" rather than the pattern "pat" at the beginning of a line.


The Answer is: A. ^pat























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