diff --git a/src/buffer.c b/src/buffer.c
index 0c1915b..f252489 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -681,6 +681,7 @@
 	/* Quitting means closing the split window, nothing else. */
 	win_close(curwin, TRUE);
 	swap_exists_action = SEA_NONE;
+	swap_exists_did_quit = TRUE;
 
 #  if defined(FEAT_AUTOCMD) && defined(FEAT_EVAL)
 	/* Restore the error/interrupt/exception state if not discarded by a
@@ -719,6 +720,7 @@
 	 * buffer.  If that buffer is gone or the same as the current one,
 	 * open a new, empty buffer. */
 	swap_exists_action = SEA_NONE;	/* don't want it again */
+	swap_exists_did_quit = TRUE;
 	close_buffer(curwin, curbuf, DOBUF_UNLOAD);
 	if (!buf_valid(old_curbuf) || old_curbuf == curbuf)
 	    old_curbuf = buflist_new(NULL, NULL, 1L, BLN_CURBUF | BLN_LISTED);
@@ -4402,6 +4404,7 @@
 		win_close(curwin, TRUE);
 		--open_wins;
 		swap_exists_action = SEA_NONE;
+		swap_exists_did_quit = TRUE;
 
 # if defined(FEAT_AUTOCMD) && defined(FEAT_EVAL)
 		/* Restore the error/interrupt/exception state if not
diff --git a/src/normal.c b/src/normal.c
index dfd2f0d..2526de3 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -2108,7 +2108,7 @@
 }
 
 /*
- * Handle the "gy" operator: call 'operatorfunc'.
+ * Handle the "g@" operator: call 'operatorfunc'.
  */
 /*ARGSUSED*/
     void
@@ -7724,7 +7724,7 @@
      *	 "gu"	    Change text to lower case.
      *	 "gU"	    Change text to upper case.
      *   "g?"	    rot13 encoding
-     *   "gy"	    call 'operatorfunc'
+     *   "g@"	    call 'operatorfunc'
      */
     case 'q':
     case 'w':
@@ -7734,7 +7734,7 @@
     case 'u':
     case 'U':
     case '?':
-    case 'y':
+    case '@':
 	nv_operator(cap);
 	break;
 
diff --git a/src/os_unix.c b/src/os_unix.c
index 89c420d..6165e9f 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -3539,7 +3539,7 @@
     int		pty_slave_fd = -1;
     char	*tty_name;
 # endif
-    int		fd_toshell[2];	    /* for pipes */
+    int		fd_toshell[2];		/* for pipes */
     int		fd_fromshell[2];
     int		pipe_error = FALSE;
 # ifdef HAVE_SETENV
@@ -3548,19 +3548,21 @@
     static char	envbuf_Rows[20];
     static char	envbuf_Columns[20];
 # endif
-    int		did_settmode = FALSE; /* TRUE when settmode(TMODE_RAW) called */
+    int		did_settmode = FALSE;	/* settmode(TMODE_RAW) called */
 
     out_flush();
     if (options & SHELL_COOKED)
 	settmode(TMODE_COOK);		/* set to normal mode */
 
-    /*
-     * 1: find number of arguments
-     * 2: separate them and built argv[]
-     */
     newcmd = vim_strsave(p_sh);
     if (newcmd == NULL)		/* out of memory */
 	goto error;
+
+    /*
+     * Do this loop twice:
+     * 1: find number of arguments
+     * 2: separate them and build argv[]
+     */
     for (i = 0; i < 2; ++i)
     {
 	p = newcmd;
@@ -3655,6 +3657,7 @@
 # ifdef __BEOS__
 	beos_cleanup_read_thread();
 # endif
+
 	if ((pid = fork()) == -1)	/* maybe we should use vfork() */
 	{
 	    MSG_PUTS(_("\nCannot fork\n"));
@@ -3728,17 +3731,24 @@
 	    {
 
 # ifdef HAVE_SETSID
-		(void)setsid();
+		/* Create our own process group, so that the child and all its
+		 * children can be kill()ed.  Don't do this when using pipes,
+		 * because stdin is not a tty, we would loose /dev/tty. */
+		if (p_stmp)
+		    (void)setsid();
 # endif
 # ifdef FEAT_GUI
-		/* push stream discipline modules */
-		if (options & SHELL_COOKED)
-		    SetupSlavePTY(pty_slave_fd);
+		if (pty_slave_fd >= 0)
+		{
+		    /* push stream discipline modules */
+		    if (options & SHELL_COOKED)
+			SetupSlavePTY(pty_slave_fd);
 #  ifdef TIOCSCTTY
-		/* try to become controlling tty (probably doesn't work,
-		 * unless run by root) */
-		ioctl(pty_slave_fd, TIOCSCTTY, (char *)NULL);
+		    /* Try to become controlling tty (probably doesn't work,
+		     * unless run by root) */
+		    ioctl(pty_slave_fd, TIOCSCTTY, (char *)NULL);
 #  endif
+		}
 # endif
 		/* Simulate to have a dumb terminal (for now) */
 # ifdef HAVE_SETENV
@@ -3895,7 +3905,7 @@
 		old_State = State;
 		State = EXTERNCMD;	/* don't redraw at window resize */
 
-		if (options & SHELL_WRITE && toshell_fd >= 0)
+		if ((options & SHELL_WRITE) && toshell_fd >= 0)
 		{
 		    /* Fork a process that will write the lines to the
 		     * external program. */
@@ -3976,6 +3986,8 @@
 		     * Don't do this when filtering and terminal is in cooked
 		     * mode, the shell command will handle the I/O.  Avoids
 		     * that a typed password is echoed for ssh or gpg command.
+		     * Don't get characters when the child has already
+		     * finished (wait_pid == 0).
 		     * Don't get extra characters when we already have one.
 		     * Don't read characters unless we didn't get output for a
 		     * while, avoids that ":r !ls" eats typeahead.
@@ -3989,6 +4001,7 @@
 						    || gui.in_use
 #endif
 						    )
+			    && wait_pid == 0
 			    && (ta_len > 0
 				|| (noread_cnt > 4
 				    && (len = ui_inchar(ta_buf,
@@ -4207,6 +4220,11 @@
 			    break;
 		    }
 
+		    /* If we already detected the child has finished break the
+		     * loop now. */
+		    if (wait_pid == pid)
+			break;
+
 		    /*
 		     * Check if the child still exists, before checking for
 		     * typed characters (otherwise we would loose typeahead).
@@ -4219,10 +4237,14 @@
 		    if ((wait_pid == (pid_t)-1 && errno == ECHILD)
 			    || (wait_pid == pid && WIFEXITED(status)))
 		    {
+			/* Don't break the loop yet, try reading more
+			 * characters from "fromshell_fd" first.  When using
+			 * pipes there might still be something to read and
+			 * then we'll break the loop at the "break" above. */
 			wait_pid = pid;
-			break;
 		    }
-		    wait_pid = 0;
+		    else
+			wait_pid = 0;
 		}
 finished:
 		p_more = p_more_save;
diff --git a/src/tag.c b/src/tag.c
index 440e220..a9d4d75 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -2419,7 +2419,8 @@
 					      , TRUE, found_tagfile_cb, NULL);
 	    hf_idx = 0;
 	}
-	else if (hf_idx >= tag_fnames.ga_len)
+
+	if (hf_idx >= tag_fnames.ga_len)
 	{
 	    /* Not found in 'runtimepath', use 'helpfile', if it exists and
 	     * wasn't used yet, replacing "help.txt" with "tags". */
diff --git a/src/vim.h b/src/vim.h
index 69092ee..9fc38f5 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1201,7 +1201,7 @@
 #define OP_FOLDDEL	24	/* "zd" delete folds */
 #define OP_FOLDDELREC	25	/* "zD" delete folds recursively */
 #define OP_FORMAT2	26	/* "gw" format operator, keeps cursor pos */
-#define OP_FUNCTION	27	/* "gy" call 'operatorfunc' */
+#define OP_FUNCTION	27	/* "g@" call 'operatorfunc' */
 
 /*
  * Motion types, used for operators and for yank/delete registers.
diff --git a/src/xxd/xxd.c b/src/xxd/xxd.c
index 299ba37..2b553dd 100644
--- a/src/xxd/xxd.c
+++ b/src/xxd/xxd.c
@@ -146,16 +146,18 @@
 #if !defined(CYGWIN) && (defined(CYGWIN32) || defined(__CYGWIN__) || defined(__CYGWIN32__))
 # define CYGWIN
 #endif
-#if defined(MSDOS) || defined(WIN32) || defined(OS2) || defined(CYGWIN)
+#if defined(MSDOS) || defined(WIN32) || defined(OS2)
 # define BIN_READ(yes)  ((yes) ? "rb" : "rt")
 # define BIN_WRITE(yes) ((yes) ? "wb" : "wt")
 # define BIN_CREAT(yes) ((yes) ? (O_CREAT|O_BINARY) : O_CREAT)
 # define BIN_ASSIGN(fp, yes) setmode(fileno(fp), (yes) ? O_BINARY : O_TEXT)
-# if defined(CYGWIN)
-#  define PATH_SEP '/'
-# else
-#  define PATH_SEP '\\'
-# endif
+# define PATH_SEP '\\'
+#elif defined(CYGWIN)
+# define BIN_READ(yes)  ((yes) ? "rb" : "rt")
+# define BIN_WRITE(yes) ((yes) ? "wb" : "w")
+# define BIN_CREAT(yes) ((yes) ? (O_CREAT|O_BINARY) : O_CREAT)
+# define BIN_ASSIGN(fp, yes) ((yes) ? (void) setmode(fileno(fp), O_BINARY) : (void) (fp))
+# define PATH_SEP '/'
 #else
 # ifdef VMS
 #  define BIN_READ(dummy)  "r"