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                            [TOC]

## 用途
*   批處理命令連接執行，使用 |
*   串聯: 使用分號 ;
*   前面成功，則執行后面一條，否則，不執行:&&
*   前面失敗，則后一條執行: ||

## 實例
`ls /proc && echo  suss! || echo failed.
`
等價于
`if ls /proc; then echo suss; else echo fail; fi
`
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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