implement an example the can broadcast to group of users

2 files changed, 12 insertions, 0 deletions

diff --git a/EXAM.md b/EXAM.md
index f02f49a..bd7af87 100644
--- a/EXAM.md
+++ b/EXAM.md
@@ -139,6 +139,12 @@ Some examples of IPC mechanisms are:
 cd "$(dirname "$0")/.."
 USER=${1}
 
+# broadcast
+for i in `grep $USER /etc/passwd | cut -d: -f1`; do
+  (echo 'hello' | write "$i") || true
+done
+
+# or find a specific user
 if cat /etc/passwd | cut -d: -f1 | grep -E "^$USER"; then
   echo "hello" | write "$USER"
 else
diff --git a/bin/greet b/bin/greet
index 947958e..50f6dce 100755
--- a/bin/greet
+++ b/bin/greet
@@ -3,6 +3,12 @@
 cd "$(dirname "$0")/.."
 USER=${1}
 
+# broadcast
+for i in `grep $USER /etc/passwd | cut -d: -f1`; do
+  (echo 'hello' | write "$i") || true
+done
+
+# or find a specific user
 if cat /etc/passwd | cut -d: -f1 | grep -E "^$USER"; then
   echo "hello" | write "$USER"
 else