Question: 17. Give the command line which deletes the lines containing the word ftp? 18. Give the command line which displays the lines containing the word

17. Give the command line which deletes the lines containing the word ftp?

18. Give the command line which displays the lines containing the word tcp?

19. Give the command line which replaces the word tcp with smtp in the range of lines between the 5th and 10th lines?

20. Give the command line which gives the number of the word "smtp" in the le where the words are initially separated with a tab or multi-tabs?

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