Add some more helper scripts

Also, add some welcoming text when the user logs in over SSH.

Vagrantfile

@@ -44,27 +44,56 @@ Vagrant.configure(2) do |config|
     # By default it just uses the one in /vagrant/target, which can
     # cause problems if it has different permissions than the other
     # directories, or contains object files compiled for the host.
-    config.vm.provision :shell, privileged: false, inline: <<-EOF
-        function put_line() {
-          grep -q -F "$2" $1 || echo "$2" >> $1
-        }
-
-        put_line ~/.bashrc 'export CARGO_TARGET_DIR=/home/#{developer}/target'
-        put_line ~/.bashrc 'export PATH=$PATH:/home/#{developer}/.cargo/bin'
+    config.vm.provision :shell, privileged: true, inline: <<-EOF
+        echo 'PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/home/#{developer}/.cargo/bin"' > /etc/environment
+        echo 'CARGO_TARGET_DIR="/home/#{developer}/target"'                                                     >> /etc/environment
     EOF
 
 
-    # Create "dexa" and "rexa" scripts that run the debug and release
-    # compiled versions of exa.
+    # Create a variety of misc scripts.
     config.vm.provision :shell, privileged: true, inline: <<-EOF
         set -xe
 
         echo -e "#!/bin/sh\n/home/#{developer}/target/debug/exa \"\\$*\"" > /usr/bin/exa
         echo -e "#!/bin/sh\n/home/#{developer}/target/release/exa \"\\$*\"" > /usr/bin/rexa
-        echo -e "#!/bin/sh\ncargo build --manifest-path /vagrant/Cargo.toml" > /usr/bin/b
-        echo -e "#!/bin/sh\ncargo test --manifest-path /vagrant/Cargo.toml" > /usr/bin/t
-        echo -e "#!/bin/sh\n/vagrant/xtests/run.sh" > /usr/bin/x
-        chmod +x /usr/bin/{exa,rexa,b,t,x}
+      
+        echo -e "#!/bin/sh\ncargo build --manifest-path /vagrant/Cargo.toml" > /usr/bin/build-exa
+        ln -sf /usr/bin/build-exa /usr/bin/b
+      
+        echo -e "#!/bin/sh\ncargo test --manifest-path /vagrant/Cargo.toml" > /usr/bin/test-exa
+        ln -sf /usr/bin/test-exa /usr/bin/t
+      
+        echo -e "#!/bin/sh\n/vagrant/xtests/run.sh" > /usr/bin/run-xtests
+        ln -sf /usr/bin/run-xtests /usr/bin/x
+
+        echo -e "#!/bin/sh\nbuild-exa && test-exa && run-xtests" > /usr/bin/compile-exa
+        ln -sf /usr/bin/compile-exa /usr/bin/c
+        
+        chmod +x /usr/bin/{exa,rexa,b,t,x,c,build-exa,test-exa,run-xtests,compile-exa}
+    EOF
+
+
+    # Write some welcoming text.
+    config.vm.provision :shell, privileged: true, inline: <<-EOF
+        rm -f /etc/update-motd.d/*
+            
+        echo -e ""                        > /etc/motd
+        echo -e "\033[1;33mThe exa development environment!\033[0m"  >> /etc/motd
+        echo -e ""                        >> /etc/motd
+        echo -e "\033[4mCommands\033[0m"  >> /etc/motd
+        echo -e "\033[32;1mb\033[0m or \033[32;1mbuild-exa\033[0m to run \033[1mcargo build\033[0m"  >> /etc/motd
+        echo -e "\033[32;1mt\033[0m or \033[32;1mtest-exa\033[0m to run \033[1mcargo test\033[0m"   >> /etc/motd
+        echo -e "\033[32;1mx\033[0m or \033[32;1mrun-xtests\033[0m to run \033[1m/vagrant/xtests/run.sh\033[0m"  >> /etc/motd
+        echo -e "\033[32;1mc\033[0m or \033[32;1mcompile-exa\033[0m to run all three\n"  >> /etc/motd
+        
+        echo 'echo -e "\\033[4mVersions\\033[0m"' > /home/ubuntu/.bash_profile
+        echo "rustc --version" >> /home/ubuntu/.bash_profile
+        echo "cargo --version" >> /home/ubuntu/.bash_profile
+        echo "echo" >> /home/ubuntu/.bash_profile
+        
+        # Disable last login date in sshd
+        sed -i '/PrintLastLog yes/c\PrintLastLog no' /etc/ssh/sshd_config
+        systemctl restart sshd
     EOF