Difference between revisions of "Zsh"
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See also the ''STARTUP/SHUTDOWN FILES'' section of {{ic|man zsh}}. | See also the ''STARTUP/SHUTDOWN FILES'' section of {{ic|man zsh}}. | ||
+ | |||
+ | === Persistent rehash === | ||
+ | |||
+ | Find yourself having to run | ||
+ | $ rehash | ||
+ | to get zsh to recognize the presence of a new executable in your {{ic|$PATH}}? | ||
+ | |||
+ | Add this line to your {{ic|zshrc}} | ||
+ | setopt nohashdirs | ||
== Uninstallation == | == Uninstallation == |
Revision as of 07:47, 9 September 2014
zh-CN:Zsh
Zsh is a powerful shell that operates as both an interactive shell and as a scripting language interpreter. While being compatible with Bash (not by default, only if issuing emulate sh
), it offers many advantages such as:
- Efficiency
- Improved tab completion
- Improved globbing
- Improved array handling
- Fully customisable
The Zsh FAQ offers more reasons to use Zsh.
Contents
- 1 Installation
- 2 Configuration files
- 3 Configurate Zsh
- 3.1 Simple .zshrc
- 3.2 Configuring $PATH
- 3.3 Command completion
- 3.4 The "command not found" hook
- 3.5 Prevent from putting duplicate lines in the history
- 3.6 Key bindings
- 3.7 History search
- 3.8 Prompts
- 3.9 Customizing the prompt
- 3.10 Dirstack
- 3.11 Help command
- 3.12 Fish-like syntax highlighting
- 3.13 Sample .zshrc files
- 3.14 Autostarting applications
- 3.15 Persistent rehash
- 4 Uninstallation
- 5 See also
Installation
Before starting users may want to see what shell is currently being used:
$ echo $SHELL
Install the zsh package available in the official repositories. For additional completion definitions, install the zsh-completions package as well.
Initial configuration
Make sure that Zsh has been installed correctly by running the following in a terminal:
$ zsh
You should now see zsh-newuser-install, which will walk you through some basic configuration. If you want to skip this, press q
. If you did not see it, you can invoke it manually with
$ zsh /usr/share/zsh/functions/Newuser/zsh-newuser-install -f
Making Zsh your default shell
If the shell is listed in /etc/shells
you can use the chsh
command to change your default shell without root access. If you installed Zsh from the official repositories, it should already have an entry in /etc/shells
.
Change the default shell for the current user:
$ chsh -s $(which zsh)
After logging back in, notice Zsh's prompt, which by default looks different from Bash's. Also verify that Zsh is the current shell by issuing:
$ echo $SHELL
~/.bashrc
to ~/.zshrc
(e.g. the prompt and the aliases) and from ~/.bash_profile
to ~/.zprofile
(e.g. the code that starts the X Window System).Configuration files
When starting Zsh, it'll source the following files in this order by default:
/etc/zsh/zshenv
- This file should contain commands to set the global command search path and other system-wide environment variables; it should not contain commands that produce output or assume the shell is attached to a tty.
~/.zshenv
- Similar to
/etc/zsh/zshenv
but for per-user configuration. Generally used for setting some useful environment variables. /etc/zsh/zprofile
- This is a global configuration file, it'll be sourced at login. Usually used for executing some general commands at login. Please note that on Arch Linux, by default it contains one line which source the
/etc/profile
, see below for details. /etc/profile
- This file should be sourced by all Bourne-compatible shells upon login: it sets up an environment upon login and application-specific (
/etc/profile.d/*.sh
) settings. Note that on Arch Linux, Zsh will also source this by default. ~/.zprofile
- This file is generally used for automatic execution of user's scripts at login.
/etc/zsh/zshrc
- Global configuration file, will be sourced when starting as a interactive shell.
~/.zshrc
- Main user configuration file, will be sourced when starting as a interactive shell.
/etc/zsh/zlogin
- A global configuration file, will be sourced at the ending of initial progress when starting as a login shell.
~/.zlogin
- Same as
/etc/zsh/zlogin
but for per-user configuration. /etc/zsh/zlogout
- A global configuration file, will be sourced when a login shell exits.
~/.zlogout
- Same as
/etc/zsh/zlogout
but for per-user configuration.
- The paths used in Arch's zsh package are different from the default ones used in the man pages.
/etc/profile
is not a part of the regular list of startup files run for Zsh, but is sourced from/etc/zsh/zprofile
in the zsh package. Users should take note that/etc/profile
sets the$PATH
variable which will overwrite any$PATH
variable set in~/.zshenv
. To prevent this, please set the$PATH
variable in~/.zshrc
. (It's not recommended to replace the default one line in/etc/zsh/zprofile
with something other, it'll break the integrality of other packages which provide some scripts in/etc/profile.d
)
Global configuration files
Occasionally users might want to have some settings applied globally to all Zsh users. The zsh(1) said that there are some global configuration files, for example /etc/zshrc
. This however is slightly different on Arch, since it has been compiled with flags specifically to target[1] /etc/zsh/
instead.
So, for global configuration use /etc/zsh/zshrc
, not /etc/zshrc
. The same goes for /etc/zsh/zshenv
, /etc/zsh/zlogin
and /etc/zsh/zlogout
. Note that these files are not installed by default, so create them if desired.
The only exception is zprofile, use /etc/profile
instead.
Configurate Zsh
Although Zsh is usable out of the box, it is almost certainly not set up the way most users would like to use it, but due to the sheer amount of customization available in Zsh, configuring Zsh can be a daunting and time-consuming experience.
Simple .zshrc
Included below is a sample configuration file, it provides a decent set of default options as well as giving examples of many ways that Zsh can be customized. In order to use this configuration save it as a file named .zshrc
. Apply the changes without needing to logout and then back in by running:
$ source ~/.zshrc
Here is a simple .zshrc
:
~/.zshrc
autoload -U compinit promptinit compinit promptinit # This will set the default prompt to the walters theme prompt walters
Configuring $PATH
Information about setting up the system path per user in zsh can be found here: http://zsh.sourceforge.net/Guide/zshguide02.html#l24
In short, put the following in ~/.zshenv
:
~/.zshenv
typeset -U path path=(~/bin /other/things/in/path $path)
Command completion
Perhaps the most compelling feature of Zsh is its advanced autocompletion abilities. At the very least, enable autocompletion in .zshrc
. To enable autocompletion, add the following to your ~/.zshrc
:
~/.zshrc
autoload -U compinit compinit
The above configuration includes ssh/scp/sftp hostnames completion but in order for this feature to work, users need to prevent ssh from hashing hosts names in ~/.ssh/known_hosts
.
no
:
/etc/ssh/ssh_config
#HashKnownHosts yes
And move ~/.ssh/known_hosts
somewhere else so that ssh creates a new one with un-hashed hostnames (previously known hosts will thus be lost). For more information, see the SSH readme for hashed-hosts.
For autocompletion with an arrow-key driven interface, add the following to:
~/.zshrc
zstyle ':completion:*' menu select
- To activate the menu, press tab twice.
For autocompletion of command line switches for aliases, add the following to:
~/.zshrc
setopt completealiases
The "command not found" hook
See Pkgfile#"Command not found" hook.
Prevent from putting duplicate lines in the history
It is very convinient to ignore duplicate lines in the history. To do so, put the following:
~/.zshrc
setopt HIST_IGNORE_DUPS
Key bindings
Zsh does not use readline, instead it uses its own and more powerful zle. It does not read /etc/inputrc
or ~/.inputrc
.
Zle has an emacs mode and a vi mode. By default, it tries to guess whether emacs or vi keys from the $EDITOR
environment variable are desired. If it is empty, it will default to emacs. Change this with bindkey -v
or bindkey -e
.
To get some special keys working:
~/.zshrc
# create a zkbd compatible hash; # to add other keys to this hash, see: man 5 terminfo typeset -A key key[Home]=${terminfo[khome]} key[End]=${terminfo[kend]} key[Insert]=${terminfo[kich1]} key[Delete]=${terminfo[kdch1]} key[Up]=${terminfo[kcuu1]} key[Down]=${terminfo[kcud1]} key[Left]=${terminfo[kcub1]} key[Right]=${terminfo[kcuf1]} key[PageUp]=${terminfo[kpp]} key[PageDown]=${terminfo[knp]} # setup key accordingly [[ -n "${key[Home]}" ]] && bindkey "${key[Home]}" beginning-of-line [[ -n "${key[End]}" ]] && bindkey "${key[End]}" end-of-line [[ -n "${key[Insert]}" ]] && bindkey "${key[Insert]}" overwrite-mode [[ -n "${key[Delete]}" ]] && bindkey "${key[Delete]}" delete-char [[ -n "${key[Up]}" ]] && bindkey "${key[Up]}" up-line-or-history [[ -n "${key[Down]}" ]] && bindkey "${key[Down]}" down-line-or-history [[ -n "${key[Left]}" ]] && bindkey "${key[Left]}" backward-char [[ -n "${key[Right]}" ]] && bindkey "${key[Right]}" forward-char [[ -n "${key[PageUp]}" ]] && bindkey "${key[PageUp]}" beginning-of-buffer-or-history [[ -n "${key[PageDown]}" ]] && bindkey "${key[PageDown]}" end-of-buffer-or-history # Finally, make sure the terminal is in application mode, when zle is # active. Only then are the values from $terminfo valid. if (( ${+terminfo[smkx]} )) && (( ${+terminfo[rmkx]} )); then function zle-line-init () { printf '%s' "${terminfo[smkx]}" } function zle-line-finish () { printf '%s' "${terminfo[rmkx]}" } zle -N zle-line-init zle -N zle-line-finish fi
cat
or read
without any parameters and press them; they should then be printed in the terminal. Both can be closed again via Ctrl+c
.Alternative method without using terminfo
Run autoload zkbd
followed by just zkbd
. If users cannot press the key it asks for (e.g. F11
maximizes the window), press space to skip it. After finishing with zkbd, add the following to ~/.zshrc
:
~/.zshrc
autoload zkbd source ~/.zkbd/$TERM-:0.0 # may be different - check where zkbd saved the configuration: [[ -n ${key[Backspace]} ]] && bindkey "${key[Backspace]}" backward-delete-char [[ -n ${key[Insert]} ]] && bindkey "${key[Insert]}" overwrite-mode [[ -n ${key[Home]} ]] && bindkey "${key[Home]}" beginning-of-line [[ -n ${key[PageUp]} ]] && bindkey "${key[PageUp]}" up-line-or-history [[ -n ${key[Delete]} ]] && bindkey "${key[Delete]}" delete-char [[ -n ${key[End]} ]] && bindkey "${key[End]}" end-of-line [[ -n ${key[PageDown]} ]] && bindkey "${key[PageDown]}" down-line-or-history [[ -n ${key[Up]} ]] && bindkey "${key[Up]}" up-line-or-search [[ -n ${key[Left]} ]] && bindkey "${key[Left]}" backward-char [[ -n ${key[Down]} ]] && bindkey "${key[Down]}" down-line-or-search [[ -n ${key[Right]} ]] && bindkey "${key[Right]}" forward-char
Bind key to ncurses application
Bind a ncurses application to a keystoke, but it will not accept interaction. Use BUFFER
variable to make it work. The following example lets users open ncmpcpp using Alt+\
:
~/.zshrc
ncmpcppShow() { BUFFER="ncmpcpp"; zle accept-line; } zle -N ncmpcppShow bindkey '^[\' ncmpcppShow
Alternate way to bind ncurses application
This method will keep everything you entered in the line before calling application
~/.zshrc
ncmpcppShow() { ncmpcpp <$TTY; zle redisplay; } zle -N ncmpcppShow bindkey '^[\' ncmpcppShow
History search
Add these lines to .zshrc
~/.zshrc
[[ -n "${key[PageUp]}" ]] && bindkey "${key[PageUp]}" history-beginning-search-backward [[ -n "${key[PageDown]}" ]] && bindkey "${key[PageDown]}" history-beginning-search-forward
Doing this, only past commands beginning with the current input would have been shown.
Prompts
There is a quick and easy way to set up a colored prompt in Zsh. Make sure that prompt is set to autoload in .zshrc
. This can be done by adding these lines to:
~/.zshrc
autoload -U promptinit promptinit
Available prompts are listed by running the command:
$ prompt -l
For example, to use the prompt walters
, enter:
$ prompt walters
To preview all available themes, use this command:
$ prompt -p
Customizing the prompt
For users who are dissatisfied with the prompts mentioned above (or want to expand their usefulness), Zsh offers the possibility to build a custom prompt. Zsh supports a left- and right-sided prompt additional to the single, left-sided prompt that is common to all shells. Customize it by using PROMPT=
with the following variables:
Prompt variables
Command | Description | Comment |
---|---|---|
General | ||
%n |
The username | |
%m |
The computer's hostname(truncated to the first period) | |
%M |
The computer's hostname | |
%l |
The current tty | |
%? |
The return code of the last-run application. | |
%# |
The prompt based on user privileges (# for root and % for the rest) |
|
Times | ||
%T |
System time(HH:MM) | |
%* |
System time(HH:MM:SS) | |
%D |
System date(YY-MM-DD) | |
Directories | ||
%d |
The current working directory. | Prefix an integer to show only certain parts of the working path. If users entered %1d and were in /usr/bin it would show bin . This can also be done with negative integers: %-1d using the same directory as above would show / .
|
%~ |
The current working directory. If in $HOME or its subdirectory, $HOME part will be replaced by ~ .
| |
Formatting | ||
%U [...] %u |
Begin and end underlined print | |
%B [...] %b |
Begin and end bold print | |
%{ [...] %} |
Begin and enter area that will not be printed. Useful for setting colors. In fact, this tag forces Zsh to ignore anything inside them when making indents for the prompt as well. As such, not to use it can have some weird effects on the margins and indentation of the prompt. | |
Colors | ||
$fg[color] |
will set the text color (red, green, blue, etc. - defaults to bold) | Zsh sets colors differently than Bash. Add autoload -U colors && colors before PROMPT= in .zshrc to use them. Usually you will want to put these inside %{ [...] %} so the cursor does not move.
|
$fg_no_bold[color] |
will set the non-bold text color | |
$fg_bold[color] |
will set the bold text color | |
$reset_color |
will reset the text color to the default color |
Possible color values | |
---|---|
black |
red
|
green |
yellow
|
blue |
magenta
|
cyan |
white
|
$fg['yellow']
looks brown or a very dark yellow, while $fg_no_bold['yellow']
looks like bright or regular yellow.Example
This is an example of a two-sided prompt:
PROMPT="%{$fg[red]%}%n%{$reset_color%}@%{$fg[blue]%}%m %{$fg_no_bold[yellow]%}%1~ %{$reset_color%}%#" RPROMPT="[%{$fg_no_bold[yellow]%}%?%{$reset_color%}]"
And here's how it will be displayed:
username@host ~ % [0]
Dirstack
Zsh can be configured to remember the DIRSTACKSIZE last visited folders. This can then be used to cd them very quickly. You need to add some lines to you configuration file:
.zshrc
DIRSTACKFILE="$HOME/.cache/zsh/dirs" if [[ -f $DIRSTACKFILE ]] && [[ $#dirstack -eq 0 ]]; then dirstack=( ${(f)"$(< $DIRSTACKFILE)"} ) [[ -d $dirstack[1] ]] && cd $dirstack[1] fi chpwd() { print -l $PWD ${(u)dirstack} >$DIRSTACKFILE } DIRSTACKSIZE=20 setopt autopushd pushdsilent pushdtohome ## Remove duplicate entries setopt pushdignoredups ## This reverts the +/- operators. setopt pushdminus
Now use
dirs -v
to print the dirstack. Use cd -<NUM>
to go back to a visited folder. Use autocompletion after the dash. This proves very handy if using the autocompletion menu.
Help command
Unlike bash, zsh does not enable a built in help
command. To use help
in zsh, add following to your zshrc
:
autoload -U run-help autoload run-help-git autoload run-help-svn autoload run-help-svk unalias run-help alias help=run-help
Fish-like syntax highlighting
Fish provides a very powerful shell syntax highlighting. To use this in zsh, you can install zsh-syntax-highlighting from offical repository and add following to your zshrc:
source /usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
Sample .zshrc files
- A package in offical repository named grml-zsh-config comes from http://grml.org/zsh and provides a zshrc file that includes many tweaks for Zshell. This is the default configuration for the monthly ISO releases.
- oh-my-zsh is a popular, community-driven framework for managing your Zsh configuration. It comes bundled with a ton of helpful functions, helpers, plugins, themes.
- Prezto - Instantly Awesome Zsh (available in AUR as prezto-gitAUR) is a configuration framework for Zsh. It comes with modules, enriching the command line interface environment with sane defaults, aliases, functions, auto completion, and prompt themes.
- Basic setup, with dynamic prompt and window title/hardinfo => http://github.com/MrElendig/dotfiles-alice/blob/master/.zshrc;
- https://github.com/slashbeast/things/blob/master/configs/DOTzshrc - zshrc with multiple features, be sure to check out comments into it. Notable features: confirm function to ensure that user want to run poweroff, reboot or hibernate, support for GIT in prompt (done without vcsinfo), tab completion with menu, printing current executed command into window's title bar and more.
Autostarting applications
$ZDOTDIR
defaults to $HOME
Zsh always executes /etc/zsh/zshenv
and $ZDOTDIR/.zshenv
so do not bloat these files.
If the shell is a login shell, commands are read from /etc/profile
and then $ZDOTDIR/.zprofile
. Then, if the shell is interactive, commands are read from /etc/zsh/zshrc
and then $ZDOTDIR/.zshrc
. Finally, if the shell is a login shell, /etc/zsh/zlogin
and $ZDOTDIR/.zlogin
are read.
See also the STARTUP/SHUTDOWN FILES section of man zsh
.
Persistent rehash
Find yourself having to run
$ rehash
to get zsh to recognize the presence of a new executable in your $PATH
?
Add this line to your zshrc
setopt nohashdirs
Uninstallation
Change the default shell before removing the zsh package.
Run following command:
$ chsh -s /bin/bash user
Use it for every user with zsh set as their login shell (including root if needed). When completed, the zsh package can be removed.
Alternatively, change the default shell back to Bash by editing /etc/passwd
as root.
vipw
when editing /etc/passwd
as it helps prevent invalid entries and/or syntax errors.For example, change the following:
username:x:1000:1000:Full Name,,,:/home/username:/bin/zsh
To this:
username:x:1000:1000:Full Name,,,:/home/username:/bin/bash
See also
- A User's Guide to ZSH
- The Z Shell Manual (different format available here)
- Zsh FAQ
- zsh-lovers(1) (this is also available as zsh-lovers in offical repository)
- Zsh Wiki
- Gentoo Wiki: Zsh/HOWTO
- Bash2Zsh Reference Card