Linux.txt

Bash: a command line interface for interacting with the operating system.
interactive mode
execution and feedback
Bash shell script
commands
functions loops conditional constructs 
Bash programming language
system administration tasks:disk backups, evaluating system logs,installation scripts

echo 'msg'

if [[ <condition> ]] ; then
	<do something>
else
	<do something>
fi

diff 命令：比较两个文件的不同

<命令> [参数列表]

Text Quote: '' ""

输出重定向 > >>
输入重定向 <
管道|
变量： <name>=<val>