打印线+接下来的两行使用awk如果下一行匹配

我有一个这样的名单赶上的Joomla版本打印线+接下来的两行使用awk如果下一行匹配

./somedir/bla/old/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '24'; 
./somedir/bla3/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '9'; 
./somedir/bla4/www/libraries/cms/version/version.php 
./somedir/bla5/www/w/scripts/version.php 
./somedir/bla6/www/libraries/cms/version/version.php 
./somedir/bla7/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '9';

我要的是，只有行+如果public是两个下一行显示在下一行。否则线必须被忽略

所以结果应该是：

./somedir/bla/old/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '24'; 
./somedir/bla3/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '9'; 
./somedir/bla7/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '9';

我曾尝试使用awk和这个awk脚本

BEGIN{ RS=""; FS="\n" } 
/public/ { 
    for (i=1; i<=NF; i++) { 
     if (! (($i ~ /./) && ($(i+1) !~ /public/) && ($(i+2) !~ /public/))) { 
      print $i 
     } 
    } 
    print "" 
}

但是这会导致：

./somedir/bla/old/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
./somedir/bla3/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
./somedir/bla7/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5';

我错过了dev_level的第二条公共线

来源

2016-12-14 Bas van den Dikkenberg

你打算在打印接下来会发生什么（难以做到，因为你还没有看到！）而不是打印之前发布的东西（容易做到 - 只是想要做到这一点）保存并打印）：

$ awk '/public/{print p $0; p=""; next} {p=$0 ORS}' file 
./somedir/bla/old/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '24'; 
./somedir/bla3/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '9'; 
./somedir/bla7/www/libraries/cms/version/version.php 
     public $RELEASE = '2.5'; 
     public $DEV_LEVEL = '9';

你发现自己试图找出如何处理基于后，随之而来的当前行做任何时间，花时间重新考虑它在做什么，当你的条件'正在处理未来的产品线（因此IT是当前的产品线）。在软件和生活中 - 看到未来比记得过去要困难得多！

来源

2016-12-14 23:58:53

此。两次。（三次由于你知道什么） –

@JamesBrown对不起，我不明白...过了漫长的一天... –

三个字符填充。 –

与grep

grep 'public $DEV' -B 2 yourfile.txt

尝试从man grep

-B NUM, --before-context=NUM 
    Print NUM lines of leading context before matching lines. 
    Places a line containing a group separator (--) between contiguous groups of matches.

来源

2016-12-15 00:35:15 bartimar

打印线+接下来的两行使用awk如果下一行匹配

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