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z - jump around

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NAME z - jump around

SYNOPSIS z [-chlrtx] [regex1 regex2 ... regexn]


DESCRIPTION Tracks your most used directories, based on 'frecency'.

After a short learning phase, z will take you to the most 'frecent' directory that matches ALL of the regexes given on the command line, in order. For example, z foo bar would match /foo/bar but not /bar/foo.

OPTIONS -c restrict matches to subdirectories of the current directory

-e echo the best match, don't cd -h show a brief help message -l list only -r match by rank only -t match by recent access only -x remove the current directory from the datafile

EXAMPLES z foo cd to most frecent dir matching foo

z foo bar cd to most frecent dir matching foo, then bar z -r foo cd to highest ranked dir matching foo z -t foo cd to most recently accessed dir matching foo z -l foo list all dirs matching foo (by frecency)

NOTES Installation: Put something like this in your $HOME/.bashrc or $HOME/.zshrc:

. /path/to/ cd around for a while to build up the db. PROFIT!! Optionally: Set $\_Z\_CMD to change the command name (default z). Set $\_Z\_DATA to change the datafile (default $HOME/.z). Set $\_Z\_MAX\_SCORE lower to age entries out faster (default 9000). Set $\_Z\_NO\_RESOLVE\_SYMLINKS to prevent symlink resolution. Set $\_Z\_NO\_PROMPT\_COMMAND to handle PROMPT\_COMMAND/precmd your- self. Set $\_Z\_EXCLUDE\_DIRS to an array of directory trees to exclude. Set $\_Z\_OWNER to allow usage when in 'sudo -s' mode. (These settings should go in .bashrc/.zshrc before the line added above.) Install the provided man page z.1 somewhere in your MANPATH, like /usr/local/man/man1.

Aging: The rank of directories maintained by z undergoes aging based on a sim- ple formula. The rank of each entry is incremented every time it is accessed. When the sum of ranks is over 9000, all ranks are multiplied by 0.99. Entries with a rank lower than 1 are forgotten.

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 far as I know, Mozilla came up with the term.

To z, a directory that has low ranking but has been accessed recently will quickly have higher rank than a directory accessed frequently a long time ago. Frecency is determined at runtime.

Common: When multiple directories match all queries, and they all have a common prefix, z will cd to the shortest matching directory, without regard to priority. This has been in effect, if undocumented, for quite some time, but should probably be configurable or reconsidered.

Tab Completion: z supports tab completion. After any number of arguments, press TAB to complete on directories that match each argument. Due to limitations of the completion implementations, only the last argument will be com- pleted in the shell.

Internally, z decides you've requested a completion if the last argu- ment passed is an absolute path to an existing directory. This may cause unexpected behavior if the last argument to z begins with /.

ENVIRONMENT A function _z() is defined.

The contents of the variable $\_Z\_CMD is aliased to \_z 2\>&1. If not set, $\_Z\_CMD defaults to z. The environment variable $\_Z\_DATA can be used to control the datafile location. If it is not defined, the location defaults to $HOME/.z. The environment variable $\_Z\_NO\_RESOLVE\_SYMLINKS can be set to prevent resolving of symlinks. If it is not set, symbolic links will be resolved when added to the datafile. 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. The environment variable $\_Z\_EXCLUDE\_DIRS can be set to an array of directory trees to exclude from tracking. $HOME is always excluded. Directories must be full paths without trailing slashes. The environment variable $\_Z\_OWNER can be set to your username, to allow usage of z when your sudo environment keeps $HOME set.

FILES Data is stored in $HOME/.z. This can be overridden by setting the $ZDATA environment variable. When initialized, z will raise an error if this path is a directory, and not function correctly.

A man page (z.1) is provided.

SEE ALSO regex(7), pushd, popd, autojump, cdargs

Please file bugs at

z January 2013 Z(1)

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