> In Bash, we often use PgUp to search through the command history. In Zsh you just write part of the command and press Up. This will let you cycle through all command lines that contain what you have written, not just those that begins with it. If you don’t write anything Up works as usual, by cycling through all commands.

This is not true, you can do that in Bash too (via .inputrc) http://blog.theliuy.com/2011/inputrc-keyboard-mapping-config...

Edit: Maybe I misunderstood though, does pressing Up really let you search all command lines that contain what you have written, not just those that begins with it? It doesn't seem to do that on my zsh.