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ssh: add -h flag to pass host (for compatibility)

--- a/sys/man/1/ssh

+++ b/sys/man/1/ssh

@@ -17,6 +17,8 @@

 .B -u

 .I user

 ] [

+.B -h

+] [

 .IR user @] host

 [

 .I cmd

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

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

@@ -1129,7 +1129,7 @@

 void

 usage(void)

 {

-	fprint(2, "usage: %s [-dR] [-t thumbfile] [-T tries] [-u user] [user@]host [cmd args...]\n", argv0);

+	fprint(2, "usage: %s [-dR] [-t thumbfile] [-T tries] [-u user] [-h] [user@]host [cmd args...]\n", argv0);

 	exits("usage");

 }

@@ -1159,6 +1159,9 @@

 	case 'u':

 		user = EARGF(usage());

 		break;

+	case 'h':

+		host = EARGF(usage());

+		break;

 	case 't':

 		thumbfile = EARGF(usage());

 		break;

@@ -1168,10 +1171,12 @@

 		break;

 	} ARGEND;

-	if(argc == 0)

-		usage();

+	if(host == nil){

+		if(argc == 0)

+			usage();

+		host = *argv++;

+	}

-	host = *argv++;

 	if(user == nil){

 		s = strchr(host, '@');

 		if(s != nil){