Exercises - UNIX - answers

1. 1. % cp foo.txt foo.txt.copy
   2. % mv foo.txt.copy foo2
   3. % mv foo2 data
   4. % mkdir new
   5. % cd data; mv foo2 ../new or
      % mv data/foo2 new
   6. % cd new; mv foo2 ../foo.old or
      % mv new/foo2 foo.old
   7. % rm foo.old
   8. % rmdir new, or
      % rm -r new
2. 1. % cat verylong.seq
   2. % more verylong.seq
   3. <return> down one line
      <space> down one page
      <u> up one page
      <d> down one page
   4. /Length
   5. <h>
      <q>

3. % chmod go+r foo.txt

4. 1. % cp edit.me edit.me.copy; pico edit.me.copy
   2. % cp edit.me edit.txt
   3. http://gcg.ch.embnet.org:8080/users/yourname/unix

5. % passwd

6. 1. % ls -a
      You will now see all hidden files beginning with a dot in the filename.
   2. % ls -R
   3. % wc
   4. % wc -l
7. 1. % ls *seq*
   2. % cp * text
   3. % ls > files.list
   4. % cat *seq* > tot.txt
   5. % ls | wc -w
8. 1. % head -5 verylong.seq
   2. % grep -i length *
   3. % diff 1.txt 2.txt
      % diff 2.txt 3.txt
   4. % head -7 verylong.seq > first-and-last
      % tail -7 verylong.seq >> first-and-last
9. 1. % find ~ -name '*seq' -print
   2. % find ~ -ctime -1 -print
10. 1. % w
       % who
       % finger
    2. % top
    3. % finger course0
11. 1. This file is Postscript source code
    2. Postscript is a language that describes graphic elements. The image generated by the Postscript interpreter can be viewed, and saved in other formats.