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Thanks will check and reply

Please help me with the questions and I am trying to learn online on my own.

1. bash
-bash escape rules, esp. ',",
-how to use Ctrl+R reverse cmd search with regex?

2. mysql
-how to use grep in mysql

3. php
-why !0 is not evaluated to true? what's its value
-php...

I want to have one .bash_profile works on multiple platform, ubuntu, debian, redhat, cygwin, osx. So how should I organize .bash_profile?
It can be multiple files in some subdir

Let me brief...