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  • [No0000CD]shell 中的单行注释和多行注释

    1. 单行注释

    众所周知,#  比如想要注释:echo “ni”

    # echo "ni"

    2. 多行注释

    法一:

    : << !
    
    语句1
    
    语句2
    
    语句3
    
    语句4
    
    !

    例如:

    linux101:/home/wsj # sh dian
    ni
    ni
    ni
    ni
    ni
    ni
    
    linux101:/home/wsj # more dian
    #!/bin/ksh
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    
    :<<!
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    !

    法二:

    : '
    
    语句1
    
    语句2
    
    语句3
    
    语句4
    
    '

    例如:

    linux101:/home/wsj # sh dian
    ni
    ni
    ni
    ni
    ni
    ni
    
    linux101:/home/wsj # more dian
    #!/bin/ksh
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    
    : '
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    '

    法三:

    if false; then
    
    语句1
    
    语句2
    
    语句3
    
    语句4
    
    fi
    
    linux101:/home/wsj # sh dian
    ni
    ni
    ni
    ni
    ni
    ni
    
    linux101:/home/wsj # more dian
    #!/bin/ksh
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    
    if false; then
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    echo "ni"
    fi

     法四:

    : << 字符  #这里的字符可以是数字或者是字符都可以
    
    语句1
    
    语句2
    
    语句3
    
    语句4
    
    字符                        

    法五:

    ((0)) & {
    
    语句1
    
    语句2
    
    语句3
    
    }
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  • 原文地址:https://www.cnblogs.com/Chary/p/No0000CD.html
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