explicitly specify --login for POSIX shells

terminus-terminal/src/shells/linuxDefault.ts

@@ -33,7 +33,8 @@ export class LinuxDefaultShellProvider extends ShellProvider {
             return [{
                 id: 'default',
                 name: 'User default',
-                command: line.split(':')[6]
+                command: line.split(':')[6],
+                args: ['--login'],
             }]
         }
     }

terminus-terminal/src/shells/macDefault.ts

@@ -20,7 +20,8 @@ export class MacOSDefaultShellProvider extends ShellProvider {
         return [{
             id: 'default',
             name: 'User default',
-            command: shellEntry.split(' ')[1].trim()
+            command: shellEntry.split(' ')[1].trim(),
+            args: ['--login'],
         }]
     }
 }

terminus-terminal/src/shells/posix.ts

@@ -24,6 +24,7 @@ export class POSIXShellsProvider extends ShellProvider {
                 id: x,
                 name: x,
                 command: x,
+                args: ['--login'],
             }))
     }
 }