diff -uNr tt/src/system.c tt.mod/src/system.c
--- src/system.c	2019-06-29 19:54:13.000000000 +0300
+++ src/system.c	2019-07-07 16:02:30.850010672 +0300
@@ -66,7 +66,7 @@
 		case 0:
 			sprintf(temp, "exec %s", right);
 			argv[2] = temp;
-			execv("/bin/sh", argv);
+			execv("@TERMUX_PREFIX@/bin/sh", argv);
 			tcgetattr(0, &run_terminal);
 			break;