complete chapter 7.17 exercise

1 files changed, 10 insertions, 0 deletions

diff --git a/README.md b/README.md
index 2791324..01db593 100644
--- a/README.md
+++ b/README.md
@@ -103,8 +103,18 @@ cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
         min = 1; quit = ^\; reprint = ^R; start = ^Q; status = ^T;
         stop = ^S; susp = ^Z; time = 0; werase = ^W;
 ```
+
 17.  Give a command line to display the types of all the files in your ∼/unix directory that start with the word chapter, are followed by a digit 1, 2, 6, 8, or 9, and end with .eps or .prn.
 
+```bash
+cd ~/unix && ls . | grep -e 'chapter[12689]\.[eps|prn]' | xargs file
+chapter1.eps: empty
+chapter1.prn: empty
+chapter2.eps: empty
+chapter6.eps: empty
+chapter8.eps: empty
+chapter9.eps: empty
+```
 
 2. Solve problems 7–17 at the end of Chapter 8.