Technical questions on bash,mysql and pHp


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# 1  
Wrench Technical questions on bash,mysql and pHp

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 getopt: what if there is duplicate in cmdline args
# 2  
Such disparate questions!

What's your point? If it's homework, you know the gig: Rules for posting homework Smilie
# 3  
Wrench

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