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Select creates a numbered menu:

select i in c00 c01 c02;do echo $i;done
select i in c00 c01 c02;do echo $i;break;done

BASH Arithmetic:

start=3; start=$((start+2)); echo $start

For Loops Syntax:

for i in `ls`; do 
echo $i
done

RC Files

By default, .bashrc reads /etc/bashrc (only for interactive logins), which loads /etc/bash_completion and /etc/bash_completion.d/*

Emulate Vi or Emacs style keys:

set -o vi

set -o emacs