Multiple choice technology operating systems

25 To delete the last word of each line in the file test1

  1. 1 sed 's/ */$//' test1
  2. 2 sed 's/ *$//' test1
  3. 3 sed 's/ \*$//' test1
  4. 4 sed 's/ \*$\/\/' test1
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sed command 's/ *$//' removes trailing spaces from each line. The pattern ' *$' matches zero or more spaces ($) at the end of a line. This will delete the last word if words are space-separated and the line has no trailing punctuation. Option A targets the beginning, C targets literal asterisks, and D has incorrect escaping.

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