Sunday, October 3, 2010

Ultimate Tab Completion

I recently switched my default shell to zsh. It has the ultimate tab competition. Watch the video to see how that works. Mostly everything else works the same as bash. I haven't found much if anything to work differently, just the better tab completion features mostly.



How I did it

First I installed zsh!
Next I used Oh My Zsh configuration.
I appended my own customizations to it (the bottom of .zshrc).
I'll explain each, so you can decide if you want to use any of that.

That includes

  • Using shift tab to do the reverse cycle through the tab completion as shown in the video
  • Everything typed by me in bold
  • Allowing comments while typing in zsh (not just scripts)
  • Importing my bash aliases and functions to zsh
  • And the same effect you normally get in Ubuntu when typing a command from a package that isn't installed.

Example of command not found working in zsh:

➜  Desktop  twm
The program 'twm' is currently not installed.  You can install it by typing:
sudo apt-get install twm
zsh: command not found: twm
➜  Desktop 

With the Oh My Zsh configuration, you can change your prompt to some custom pre-made ones. I use the default because I like that one.

The Guide

# You need to apt-get install git-core if you don't already have the git command
$ git clone git://github.com/robbyrussell/oh-my-zsh.git ~/.oh-my-zsh 
Initialized empty Git repository in /home/phillip/.oh-my-zsh/.git/
remote: Counting objects: 1173, done.
remote: Compressing objects: 100% (591/591), done.
remote: Total 1173 (delta 714), reused 873 (delta 543)
Receiving objects: 100% (1173/1173), 135.71 KiB | 102 KiB/s, done.
Resolving deltas: 100% (714/714), done.
# On the next line, if you don't know how to use vim, replace it with gedit
$ sudo vim /etc/passwd
# Change the line:
#  username:x:1000:1000:Your Name,,,,:/home/username:/bin/bash
# To:
#  username:x:1000:1000:Your Name,,,,:/home/username:/bin/zsh
# The only part you need to change is /bin/bash to /bin/zsh at the end!
$ grep $USER /etc/passwd # This command is just to check that the change was made
phillip:x:1004:1001:Phillip,,,,:/home/phillip:/bin/zsh
$ cp .oh-my-zsh/templates/zshrc.zsh-template ~/.zshrc
# Append these to the end of your .zshrc after the comment about customization 
# Meaning add these 4 lines to the end of your .zshrc

# Customize to your needs...

bindkey '^[[Z' reverse-menu-complete # Reverse tab cycle
zle_highlight=( default:bold ) # Bold everything typed
setopt interactivecomments # Allow comments in interactive mode
command_not_found_handler() {/usr/lib/command-not-found $1} # Good 1 ;)

# If you are using debian lenny, the command-not-found package is not in the repos,
# Otherwise, It works with sid and newer as well as in Ubuntu

# The rest of the guide is optional!
# If you want to use some of my bash functions and aliases, continue
# Otherwise just logout and back in and your shell will be using zsh!
# Also my some of my functions and aliases use things such as hamachi,
# So you must edit the file to add/remove what you want.
# If you don't feel comfortable doing that, stop here, logout and back in!

$ mkdir ~/.bash
$ wget -O ~/.bash/functions_and_aliases http://nanomachine.byethost22.com/files/functions_and_aliases
--2010-10-03 22:51:23--  http://nanomachine.byethost22.com/files/functions_and_aliases
Resolving nanomachine.byethost22.com... 209.190.24.9
Connecting to nanomachine.byethost22.com|209.190.24.9|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: `/home/phillip/.bash/functions_and_aliases'

[ <=>                                                            ] 2,436       --.-K/s   in 0.01s   

2010-10-03 22:51:31 (183 KB/s) - `/home/phillip/.bash/functions_and_aliases' saved [2436]


$ zsh
➜  ~  grep '()\|alias' ~/.bash/functions_and_aliases 
myip() { # Display my external internet IP in one line
pfix() { # Permission fix for apache public_html
hr() { # Hamachi run
hs() { # Hamachi stop
hl() { # Hamachi list only online members/networks
psgrep() { # Results ps grep # Takes one arguement
fixntfs() { # When NTFS won't mount
wifireset() { # Reset the wifi connection in case it quits working
ushred() { # Shred files on my ultimate settings
alias lsonf='lsof -i -n -Pi' # List open network files
alias goog="curl -A Mozilla http://www.google.com/search?q=Linux |html2text -width 80" # Google from the CLI; Needs a little more work
alias hsgrep='history | grep $1' # History grep
# More created aliases
alias autopurge='sudo apt-get --purge autoremove'
alias cd...='cd ../'
alias ...='cd ../../'

➜  ~  
# Append this to the end of your .zshrc after the comment about customization 
# Meaning add this one line to the end of your .zshrc

source ~/.bash/functions_and_aliases # Import bash f(x)'s and aliases

# Be sure to edit that functions_and_aliases file
# To be correct for your computer. For example,
# /dev/sda1 and /dev/sdc1 may not be your ntfs partitions if you dual boot
# If you don't use hamachi vpn, remove those, don't use wifi,
# Then remove the wifireset() {...} function, etc.

➜  ~  source ~/.zshrc

# Now you can use all the functions and alises in that file.
# Also append that source line to your .bashrc if you want to use them in bash
# Here's are two examples
➜  ~  myip
12.182.175.183
➜  ~  psgrep xchat

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
chris     2724  0.9  1.7 303568 36356 ?        Sl   19:47   1:44 xchat
phillip  14298  0.0  0.0   7624   908 pts/5    S+   22:56   0:00 grep xchat


GNU Screen and configuration 
(because I used it in the video)

Read here:
http://magazine.redhat.com/2007/09/27/a-guide-to-gnu-screen/

Here's my ~/.screenrc
Note: If you use this, change the directories to ones that exist on your computer

hardstatus alwayslastline
hardstatus string '%{= kG}[ %{G}%H %{g}][%= %{=kw}%?%-Lw%?%{r}(%{W}%n*%f%t%?(%u)%?%{r})%{w}%?%+Lw%?%?%= %{g}][%{B}%Y-%m-%d %{W}%c %{g}]'

# Default screens

chdir ~/
screen -t bash    0 /bin/bash
chdir ~/Coding/CS2213
screen -t zsh    1 # will run zsh by default
chdir ~/Hax0r
screen -t zsh     2 # will run zsh by default
chdir ~/
screen -t zsh     3

And then type screen and that config will be loaded.

Visual Recursive Quick Sort



Final Step

Now after you did all that, head to your gym and squat 385 lbs 2 times (or as many as you can till failure)