diff -ur v18/site_ut.py v19/site_ut.py
--- v18/site_ut.py	2020-04-25 23:24:40.000000000 +0900
+++ v19/site_ut.py	2020-04-25 23:42:43.000000000 +0900
@@ -158,7 +158,7 @@
 
 if __name__ == "__main__":
 	site = new( 'ftp_ut.yaml' )
-	cmds = ( 'put', 'get' )
+	cmds = ( 'put', 'get', 'exists' )
 	a = arg.new()
 	k = a.pop()
 	if k in cmds:
@@ -170,6 +170,13 @@
 			elif k == 'get':
 				if not get( st.url, path ):
 					sys.exit( 1 )
+			elif k == 'exists':
+				s = '{}/{}'.format( st.url, path )
+				r = exists_url( s )
+				h = 'found' if r else 'not found'
+				dbg.out( h + ' ' + s )
+				if not r:
+					sys.exit( 1 )
 	else:
 		st = site.get( k )
 		if st: