update doc

README.cn.md

@@ -20,7 +20,8 @@ z.lua 是一个快速路径切换工具，它会跟踪你在 shell 下访问过
 - 新增：环境变量 "$_ZL_ADD_ONCE" 设成 1 的话性仅当前路径改变时才更新数据库。
 - 新增：增强匹配模式，将环境变量 "$_ZL_MATCH_MODE" 设置成 1 可以启用。
 - 新增：交互选择模式，如果有多个匹配结果的话，跳转前允许你进行选择。
-- 新增：支持 fzf 来进行多结果筛选，见后面文档。
+- 新增：支持 fzf 来进行多结果筛选，见后面文档。
+- 新增：快速跳转到父目录，代替反复 “cd ../../.." 。
 
 
 ## Examples

README.md

@@ -26,7 +26,8 @@ For example, `z foo bar` would match `/foo/bar` but not `/bar/foo`.
 - New "$_ZL_ADD_ONCE" to allow updating database only if `$PWD` changed.
 - Enhanced matching mode with "$_ZL_MATCH_MODE" set to 1.
 - Interactive selection enables you to choose where to go before cd.
-- Support fzf for selecting from multiple results.
+- Support fzf for selecting from multiple results (optional).
+- Quickly go back to a parent directory instead of typing "cd ../../..".
 
 
 ## Examples
@@ -249,6 +250,64 @@ Usually, `z -I` can be aliased to `zf` (z + fuzzy finder) for convenience. If th
 
 NOTE: For fish shell, this feature requires fish 2.7.0 or above. You can specify fzf executable in `$_ZL_FZF` environment variable, `"fzf"` will be called by default.
 
+## Jump Backwards
+
+New option `"-b"` to quickly go back to a specific parent directory in bash instead of typing "cd ../../.." redundantly.
+
+- **(No argument)** `cd` into the project root:
+
+  Use `z -b` with no argument, it will look for the project (checkout) directory (the one with `.git`/`.hg`/`.svn` in it) and then `cd` into it.
+
+- **(One argument)** `cd` into the closest parent having its name begin with whatever the value you passed in:
+
+  If you are in this path `/home/user/project/src/org/main/site/utils/file/reader/whatever` and you want to go to `site` directory quickly, 
+
+  then just type: `z -b site`
+
+  In fact, You can simply type `z -b <starting few letters>` like `z -b s` or `z -b si`.
+  If there are more than one directories with same name up in the hierarchy, `z -b` will take you to the closest. 
+
+- **(Two arguments)** replace the first value with the second one (in the current path).
+
+Let's start by alising `z -b` to `zb`:
+
+```bash
+# go all the way up to the project root (in this case, the one that has .git in it)
+~/github/lorem/src/public$ zb
+  => cd ~/github/lorem
+
+# cd into to the first parent directory named g*
+~/github/vimium/src/public$ zb g
+  => cd ~/github
+
+# substitute jekyll with ghost
+~/github/jekyll/test$ zb jekyll ghost
+  => cd ~/github/ghost/test
+```
+
+## Echo target result
+
+Backward jumping can also be used with `$_ZL_ECHO` option (echo $pwd), which makes it possible to combine them with other tools (without actually changing the working directory):
+
+```bash
+# Assuming we are in ~/github/vim/src/libvterm
+# Enable $_ZL_ECHO to emit a pwd command after cd
+$ _ZL_ECHO=1
+
+# see what's in my project root
+$ ls -l `zb`
+  => ls -l ~/github/vim
+
+# check log in "<project root>/logs"
+$ tail -f `zb`/logs/error.log
+  => tail -f ~/github/vim/logs/error.log
+
+# list some parent directory
+$ ls -l `zb git`
+  => ls -l ~/github
+
+```
+
 
 ## Tips
 
@@ -258,6 +317,7 @@ Recommended aliases you may find useful:
 alias zc='z -c'      # restrict matches to subdirs of $PWD
 alias zz='z -i'      # cd with interactive selection
 alias zf='z -I'      # use fzf to select in multiple matches
+alias zb='z -b'      # cd backwards to parent directory
 ```
 
 
@@ -319,12 +379,13 @@ awk -F '\t' '{print $2 "|" $1 "|" 0}' $FN >> ~/.zlua
 - 0.1.0 (2018-04-30): supports windows cmd, cmder and conemu.
 - 0.0.0 (2018-03-21): initial commit, compatible with original z.sh.
 
-## Credit
+## Thanks
 
-Releated projects:
+Thanks to @rupa for inspiring me to start this project.
+Thanks to @vigneshwaranr and @shyiko for inspiring me the backward jumping.
+Thanks to @TeddyDD for fish shell porting.
 
-- [rupa/z](https://github.com/rupa/z): origin z.sh implementation
-- [JannesMeyer/z.ps](https://github.com/JannesMeyer/z.ps): z for powershell
+And many others.
 
 
 ## License