I'm a happy user of [zsh]for a few years now and, while I don't know all the subtleties of it, I find it a indispensable tool. People I know and respect keep asking me "Why not bash?" One of the big reasons is [zsh's completion system.]
Bash has a add-on version of this, called [bash-completion], and I used that before moving over to zsh full-time. Bash-completion feels, well, added on and slow and not always working. Zsh's completion, however, keeps surprising me on how much it does do. As they say, a picture is worth a thousand words.
[caption id="attachment_722" align="aligncenter" width="300" caption="I typed "./manage.py TAB" and Zsh gave me all the arguments of a standard Django manage script."][![ZSH doing Django Completion]][/caption]
The above screenshot came with no configuration -- I didn't have to tell zsh about Django because, well, [someone already did]. And I'm glad for it.
It's not just for Django, either. See what happened when I did "./configure
[caption id="attachment_724" align="aligncenter" width="300" caption="The top part is what I got when I did "./configure TAB". The part below my prompt is what I got when I did "./configure --with-TAB""][![Zsh when configuring soruce]][/caption]
So note that zsh helps me figure out the right options. What I want to know the exact options for MySQL?
[caption id="attachment_725" align="aligncenter" width="300" caption="Results of ./configure --with-mTAB"][![Results of ./configure --with-mTAB]][/caption]
Again, none of this stuff had to be configured -- I just told zsh I wanted completion and it gave it to me. I didn't have to tell it that this was a configure script -- it knew that! Just like it knew about the Django script.
This is just a taste. I hope you bite into zsh for more goodness.
"ZSH doing Django Completion" "Zsh when configuring soruce" "Results of ./configure --with-mTAB"