update mac specific examples to linux version.

1 files changed, 24 insertions, 17 deletions

diff --git a/README.md b/README.md
index 906c1d8..b0e2528 100644
--- a/README.md
+++ b/README.md
@@ -143,12 +143,12 @@ See `exercises/chapter-7.17`.
 
 Permission bits are organized as follows:
 
-| t | r | w | x | r | w | x | r | w | x |
+| - | r | w | x | r | w | x | r | w | x |
 
-* The first bit indicates if the file is a directory or has the `setuid` bit enabled.
-* The following 3 bits represent the read, write, execute permissions for the user.
-* The following 3 bits represent the read, write, execute permissions for the group.
-* The following 3 bits represent the read, write, execute permissions for everyone else.
+* The first bit indicates entry type. (d: directory, c: character special file, l: symbolic link, s: socket)
+* The following 3 bits represent the read, write, execute permissions for the `user`.
+* The following 3 bits represent the read, write, execute permissions for the `group`.
+* The following 3 bits represent the read, write, execute permissions for `everyone` else.
 
 E.g
 
@@ -162,23 +162,30 @@ $ ls -alh README.md
 * The following `r--` indicate read permissions for members of the group.
 * The following `r--` indicate read permissions for everyone else.
 
-8. How many user groups exist on your system? How did you get your answer?
-What groups are you a member of and what is your default group?
-How many groups is root a member of, on your system?
-How did you obtain your answer?
-If used any commands, show the commands and their outputs.
+8. How many user groups exist on your system?
+
+There are 3 groups on my system.
 
 ```bash
-$ users
-mokha
-$ id -Gn
-staff everyone localaccounts _appserverusr admin _appserveradm _lpadmin com.apple.sharepoint.group.1 _appstore _lpoperator _developer _analyticsusers com.apple.access_ftp com.apple.access_screensharing com.apple.access_ssh com.apple.sharepoint.group.2
 $ groups
-staff everyone localaccounts _appserverusr admin _appserveradm _lpadmin com.apple.sharepoint.group.1 _appstore _lpoperator _developer _analyticsusers com.apple.access_ftp com.apple.access_screensharing com.apple.access_ssh com.apple.sharepoint.group.2
+mokha wheel docker
+```
+
+What groups are you a member of and what is your default group?
+
+I am a member of the groups `mokha`, `wheel` and `docker`. `mokha` is my
+default group.
+
+```bash
 $ groups mokha
-staff everyone localaccounts _appserverusr admin _appserveradm _lpadmin com.apple.sharepoint.group.1 _appstore _lpoperator _developer _analyticsusers com.apple.access_ftp com.apple.access_screensharing com.apple.access_ssh com.apple.sharepoint.group.2
+mokha : mokha wheel docker
+```
+
+How many groups is root a member of, on your system?
+
+```bash
 $ groups root
-wheel daemon kmem sys tty operator procview procmod everyone staff certusers localaccounts admin com.apple.sharepoint.group.1 _appstore _lpadmin _lpoperator _developer _analyticsusers com.apple.access_ftp com.apple.access_screensharing com.apple.access_ssh com.apple.sharepoint.group.2
+root : root
 ```
 
 See `exercises/chapter-8.8`.