add cat command to output sys files

lisa/tools/__init__.py

@@ -1,3 +1,4 @@
+from .cat import Cat
 from .echo import Echo
 from .gcc import Gcc
 from .git import Git
@@ -6,4 +7,4 @@ from .make import Make
 from .ntttcp import Ntttcp
 from .uname import Uname
 
-__all__ = ["Echo", "Gcc", "Git", "Lscpu", "Make", "Ntttcp", "Uname"]
+__all__ = ["Cat", "Echo", "Gcc", "Git", "Lscpu", "Make", "Ntttcp", "Uname"]

lisa/tools/cat.py

@@ -0,0 +1,10 @@
+from lisa.executable import Tool
+
+
+class Cat(Tool):
+    @property
+    def command(self) -> str:
+        return "cat"
+
+    def _check_exists(self) -> bool:
+        return True