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iostats: dont prefix /bin to argv[0] when already absolute or relative path

--- a/sys/src/cmd/iostats.c

+++ b/sys/src/cmd/iostats.c

@@ -316,8 +316,9 @@

 		open("/fd/2", OWRITE);

 		if(chdir(buf) < 0)

 			sysfatal("chdir");

-		exec(argv[0], argv);

-		exec(smprint("/bin/%s", argv[0]), argv);

+		exec(*argv, argv);

+		if(**argv != '/' && strncmp(*argv, "./", 2) != 0 && strncmp(*argv, "../", 3) != 0)

+			exec(smprint("/bin/%s", *argv), argv);

 		sysfatal("exec: %r");

 	default:

 		close(pfd[0]);

-- 

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