added some programs for using the user system

exec/passwd.lua

@@ -0,0 +1,4 @@
+local tA = {...}
+local s=os.gensalt(16)
+io.write("New password for "..tA[1]..": ")
+os.setuser(tA[1],sha.sha256(io.read("*")..s),s)

exec/su.lua

@@ -0,0 +1,5 @@
+local tA = {...}
+local s=os.gensalt(16)
+io.write("Password for "..tA[1]..": ")
+local res = os.su(tA[1],io.read("*"))
+if not res then print("Failed.") end