Update install_cmd.sh

MP1/scripts/install_cmd.sh

@@ -1,7 +1,6 @@
-rm -rf ~/bin
+rm -rf "$HOME/bin/grepp"
 chmod +x ../client.py
-mkdir -p ~/bin
-cp ../client.py ~/bin/grepp
-chmod +x ~/bin/grepp
-echo 'export PATH="$HOME/bin:$PATH"' >> ~/.bashrc
+mkdir -p "$HOME/bin"
+install -m 755 ../client.py "$HOME/bin/grepp"
+echo 'export PATH="$HOME/bin:$PATH"' >> "$HOME/.bashrc"
 source ~/.bashrc