SOC 103M Winter 2002 Midterm Solutions

Dana Dahlstrom

2002.02.13

1. [44 points]
   1. [4 points] :%s/utta/utter/g
   2. [6 points] :%s/Calcutter/Calcutta/g or /Calcutter followed by cwCalcutta or any other description of a working solution
   3. [2 points] 3G or :3 goes to line 3
   4. [2 points] 11| goes to column 11 in the current line
   5. [2 points] 2h4l or hhllll
   6. [2 points] $ goes to the end of the line
   7. [2 points] 4G or :4 (or j from line 3) goes to line 4. ^ goes to the first non-blank character. 0 goes to the first character even if blank. Also, 4G and :4 already go to the first non-blank character (j doesn't).
   8. [2 points] 2k or kk
   9. [2 points] 6G or :6 goes to line 6; dd deletes the line
   10. [2 points] p puts the text after the cursor
   11. [2 points] 6G or :6 goes to line 6; "add deletes the line into register a
   12. [2 points] "aP puts the text from register a before the cursor
   13. [4 points] 1G or :1 goes to line 1; A appends at the end of the line
   14. [4 points] 1G or :1 goes to line 1; I inserts before the first non-blank character on the line.
   15. [4 points] Ctrl-D scrolls down half a screen; Ctrl-U scrolls up half a screen; H goes to the first non-blank character of the line at the top of the screen; L goes to the first non-blank character of the line at the bottom of the screen.
   16. [2 points] :wq writes the current file and quits
2. [44 points]
   1. [6 points] grep "t[eoia]n" oink.txt
   2. [14 points]
      grep "[A-Z][a-h2-6, ][357]"
grep -v "[A-Z][a-h2-6, ][357]"
grep "^[A-Z][a-h2-6, ][357]"
grep "[A-Z][a-h2-6, ][357]$"
   3. [4 points] grep "^$"
   4. [4 points] sort -k1,1 clean_limerick.txt
   5. [8 points]
      ls
ls > listoffiles.txt
ls | wc -l
   6. [8 points]
      cd ..
cd - or cd so103class
mkdir schlemiel
3. [40 points]
   1. [2 points] { print $0 } or just { print }
   2. [6 points] { if ($2 = 2) print =
   3. [12 points] There are slicker ways, but this was shown in class:

       
      {
        sex = $2
        if (sex == 1) sexmales = sexmales + 1
        if (sex == 2) sexfemales = sexfemales + 1
      }
      END {
        print sexmales, "males"
        print sexfemales, "females"
      }
      

   4. [12 points]

      NR

      Number of the current record.

      NF

      Number of fields in the current record.

      $NF

      The last field of the current record.

      $(NF-1)

      The next-to-last field of the current record.

      $2

      The second field in the current record.

      $0

      The (entire) current record.

   5. [8 points]

       
      BEGIN {
        for ( x = 3; x <= 10; x = x + 1 ) {
          print x
        }
      }