Append, rather than prepend to PROMPT_COMMAND

README

@@ -71,7 +71,7 @@ NOTES
 
    Frecency:
        Frecency is a portmanteau of 'recent' and 'frequency'. It is a weighted
-       rank  that  depends on how often and how recently something occurred. As
+       rank  that depends on how often and how recently something occurred. As
        far as I know, Mozilla came up with the term.
 
        To z, a directory that has low ranking but has been  accessed  recently
@@ -109,9 +109,9 @@ ENVIRONMENT
        resolving  of  symlinks.  If  it  is  not  set,  symbolic links will be
        resolved when added to the datafile.
 
-       In bash, z prepends a command to the PROMPT_COMMAND  environment  vari-
-       able  to  maintain its database. In zsh, z appends a function _z_precmd
-       to the precmd_functions array.
+       In bash, z appends a command to the PROMPT_COMMAND environment variable
+       to maintain its database. In zsh, z appends a function _z_precmd to the
+       precmd_functions array.
 
        The environment variable $_Z_NO_PROMPT_COMMAND can be set if  you  want
        to handle PROMPT_COMMAND or precmd yourself.

z.1

@@ -134,7 +134,7 @@ The environment variable \fB$_Z_NO_RESOLVE_SYMLINKS\fR can be set to prevent
 resolving of symlinks. If it is not set, symbolic links will be resolved when
 added to the datafile.
 .P
-In bash, \fBz\fR prepends a command to the \fBPROMPT_COMMAND\fR environment
+In bash, \fBz\fR appends a command to the \fBPROMPT_COMMAND\fR environment
 variable to maintain its database. In zsh, \fBz\fR appends a function
 \fB_z_precmd\fR to the \fBprecmd_functions\fR array.
 .P

z.sh

@@ -218,7 +218,7 @@ elif complete &> /dev/null; then
  [ "$_Z_NO_PROMPT_COMMAND" ] || {
   # bash populate directory list. avoid clobbering other PROMPT_COMMANDs.
   echo $PROMPT_COMMAND | grep -q "_z --add" || {
-   PROMPT_COMMAND='_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'"$PROMPT_COMMAND"
+   PROMPT_COMMAND="${PROMPT_COMMAND%;}"';_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'
   }
  }
 fi