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+# scd - smart change of directory
+
+Define `scd` shell function for changing to any directory with
+a few keystrokes.
+
+`scd` keeps history of the visited directories, which serves as an index of
+the known paths.  The directory index is updated after every `cd` command in
+the shell and can be also filled manually by running `scd -a`.  To switch to
+some directory, `scd` needs few fragments of the desired path to match with
+the index.  A selection menu is displayed in case of several matches, with a
+preference given to recently visited paths.  `scd` can create permanent
+directory aliases, which appear as named directories in zsh session.
+
+## INSTALLATION NOTES
+
+Besides oh-my-zsh, `scd` can be used with *bash*, *dash* or *tcsh*
+shells and is also available as Vim plugin
+[scd.vim](https://github.com/pavoljuhas/scd.vim) and
+[IPython](https://ipython.org) extension.  For installation details, see
+https://github.com/pavoljuhas/smart-change-directory.
+
+## SYNOPSIS
+
+```sh
+scd [options] [pattern1 pattern2 ...]
+```
+
+## PATTERNS
+
+Patterns may use all zsh [glob operators](
+http://zsh.sourceforge.net/Doc/Release/Expansion.html#Glob-Operators)
+available with *extendedglob* option.  Specified patterns must match
+the absolute path and at least one of them must match in the tail.
+Several special patterns are also recognized as follows:
+
+<dl><dt>
+^PAT</dt><dd>
+  PAT must match at the beginning of the path, for example, "^/home"</dd><dt>
+PAT$</dt><dd>
+  require PAT to match the end of the path, "man$"</dd><dt>
+./</dt><dd>
+  match only subdirectories of the current directory</dd><dt>
+:PAT</dt><dd>
+  require PAT to match over the tail component, ":doc", ":re/doc"</dd>
+</dl>
+
+
+## OPTIONS
+
+<dl><dt>
+-a, --add</dt><dd>
+  add current or specified directories to the directory index.</dd><dt>
+
+--unindex</dt><dd>
+  remove current or specified directories from the index.</dd><dt>
+
+-r, --recursive</dt><dd>
+  apply options <em>--add</em> or <em>--unindex</em> recursively.</dd><dt>
+
+--alias=ALIAS</dt><dd>
+  create alias for the current or specified directory and save it to
+  <em>~/.scdalias.zsh</em>.</dd><dt>
+
+--unalias</dt><dd>
+  remove ALIAS definition for the current or specified directory from
+  <em>~/.scdalias.zsh</em>.  Use "OLD" to purge aliases to non-existent
+  directories.</dd><dt>
+
+-A, --all</dt><dd>
+  display all directories even those excluded by patterns in
+  <em>~/.scdignore</em>.  Disregard the unique matching for a
+  directory alias and filtering of less likely paths.</dd><dt>
+
+-p, --push</dt><dd>
+  use "pushd" to change to the target directory.</dd><dt>
+
+--list</dt><dd>
+  show matching directories and exit.</dd><dt>
+
+-v, --verbose</dt><dd>
+  display directory rank in the selection menu.</dd><dt>
+
+-h, --help</dt><dd>
+  display this options summary and exit.</dd>
+</dl>
+
+
+## Examples
+
+```sh
+# Index recursively some paths for the very first run
+scd -ar ~/Documents/
+
+# Change to a directory path matching "doc"
+scd doc
+
+# Change to a path matching all of "a", "b" and "c"
+scd a b c
+
+# Change to a directory path that ends with "ts"
+scd "ts$"
+
+# Show selection menu and ranking of 20 most likely directories
+scd -v
+
+# Alias current directory as "xray"
+scd --alias=xray
+
+# Jump to a previously defined aliased directory
+scd xray
+```
+
+## FILES
+
+<dl><dt>
+~/.scdhistory</dt><dd>
+    time-stamped index of visited directories.</dd><dt>
+
+~/.scdalias.zsh</dt><dd>
+    scd-generated definitions of directory aliases.</dd><dt>
+
+~/.scdignore</dt><dd>
+    <a href="http://zsh.sourceforge.net/Doc/Release/Expansion.html#Glob-Operators">
+    glob patterns</a> for paths to be ignored in the scd search, for example,
+    <code>/mnt/backup/*</code>.  The patterns are specified one per line
+    and are matched assuming the <em>extendedglob</em> zsh option.  Lines
+    starting with "#" are skipped as comments.  The .scdignore patterns
+    are not applied in the <em>--all</em> mode.</dd>
+</dl>
+
+
+## ENVIRONMENT
+
+<dl><dt>
+SCD_HISTFILE</dt><dd>
+    path to the scd index file (by default ~/.scdhistory).</dd><dt>
+
+SCD_HISTSIZE</dt><dd>
+    maximum number of entries in the index (5000).  Index is trimmed when it
+    exceeds <em>SCD_HISTSIZE</em> by more than 20%.</dd><dt>
+
+SCD_MENUSIZE</dt><dd>
+    maximum number of items for directory selection menu (20).</dd><dt>
+
+SCD_MEANLIFE</dt><dd>
+    mean lifetime in seconds for exponential decay of directory
+    likelihood (86400).</dd><dt>
+
+SCD_THRESHOLD</dt><dd>
+    threshold for cumulative directory likelihood.  Directories with
+    a lower likelihood compared to the best match are excluded (0.005).
+    </dd><dt>
+
+SCD_SCRIPT</dt><dd>
+    command script file where scd writes the final <code>cd</code>
+    command.  This variable must be defined when scd runs in its own
+    process rather than as a shell function.  It is up to the
+    scd caller to use the output in <em>SCD_SCRIPT</em>.</dd>
+</dl>