diff -up openssh-5.9p0/ssh-keygen.0.keygen openssh-5.9p0/ssh-keygen.0

--- openssh-5.9p0/ssh-keygen.0.keygen	2011-08-29 16:30:02.000000000 +0200

+++ openssh-5.9p0/ssh-keygen.0	2011-08-30 13:47:56.208087184 +0200

@@ -4,7 +4,7 @@ NAME

      ssh-keygen - authentication key generation, management and conversion

 SYNOPSIS

-     ssh-keygen [-q] [-b bits] -t type [-N new_passphrase] [-C comment]

+     ssh-keygen [-q] [-o] [-b bits] -t type [-N new_passphrase] [-C comment]

                 [-f output_keyfile]

      ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]

      ssh-keygen -i [-m key_format] [-f input_keyfile]

@@ -181,6 +181,8 @@ DESCRIPTION

              principals may be specified, separated by commas.  Please see the

              CERTIFICATES section for details.

+     -o      Overwrite the key without prompting user.

+

      -O option

              Specify a certificate option when signing a key.  This option may

              be specified multiple times.  Please see the CERTIFICATES section

diff -up openssh-5.9p0/ssh-keygen.1.keygen openssh-5.9p0/ssh-keygen.1

--- openssh-5.9p0/ssh-keygen.1.keygen	2011-08-30 13:32:30.787149917 +0200

+++ openssh-5.9p0/ssh-keygen.1	2011-08-30 13:46:42.638087171 +0200

@@ -45,6 +45,7 @@

 .Bk -words

 .Nm ssh-keygen

 .Op Fl q

+.Op Fl o

 .Op Fl b Ar bits

 .Fl t Ar type

 .Op Fl N Ar new_passphrase

@@ -339,6 +340,8 @@ Multiple principals may be specified, se

 Please see the

 .Sx CERTIFICATES

 section for details.

+.It Fl o

+Overwrite the key without prompting user.

 .It Fl O Ar option

 Specify a certificate option when signing a key.

 This option may be specified multiple times.

diff -up openssh-5.9p0/ssh-keygen.c.keygen openssh-5.9p0/ssh-keygen.c

--- openssh-5.9p0/ssh-keygen.c.keygen	2011-08-30 13:32:20.268149992 +0200

+++ openssh-5.9p0/ssh-keygen.c	2011-08-30 13:39:34.550214102 +0200

@@ -73,6 +73,7 @@ int change_passphrase = 0;

 int change_comment = 0;

 int quiet = 0;

+int overwrite = 0;

 int log_level = SYSLOG_LEVEL_INFO;

@@ -1959,7 +1960,7 @@ main(int argc, char **argv)

 		exit(1);

 	}

-	while ((opt = getopt(argc, argv, "AegiqpclBHLhvxXyF:b:f:t:D:I:P:m:N:n:"

+	while ((opt = getopt(argc, argv, "AegiqopclBHLhvxXyF:b:f:t:D:I:P:m:N:n:"

 	    "O:C:r:g:R:T:G:M:S:s:a:V:W:z:")) != -1) {

 		switch (opt) {

 		case 'A':

@@ -2042,6 +2043,9 @@ main(int argc, char **argv)

 		case 'q':

 			quiet = 1;

 			break;

+		case 'o':

+			overwrite = 1;

+			break;

 		case 'e':

 		case 'x':

 			/* export key */

@@ -2278,7 +2282,7 @@ main(int argc, char **argv)

 		}

 	}

 	/* If the file already exists, ask the user to confirm. */

-	if (stat(identity_file, &st) >= 0) {

+	if (!overwrite && stat(identity_file, &st) >= 0) {

 		char yesno[3];

 		printf("%s already exists.\n", identity_file);

 		printf("Overwrite (y/n)? ");