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