在下面的示例中^[-是用于着色终端输出的转义字符（只需键入ctrl+v++）。
1）我的档案：
-------- just to mark start of file ----------
^[[1;31mbla bla bla^[[0m
^[[0;36mTREE;01;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mapple tree:^[[0m^[[0m
^[[1;31m4 apples^M^M^[[0m
^[[1;31m6 leafs^M^[[0m
^[[0;36mTREE;02;^[[0m
^[[0;36mTREE;03;^[[0m
withered
^[[0;36mTREE;04;^[[0m
^[[0;36mTREE;05;^[[0m
^[[0;36mTREE;06;^[[0m
^[[0;36mTREE;07;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mcherry tree:^[[0m^[[0m
^[[1;31mbig branches^M^M^[[0m
^[[1;31mtchick roots^M^[[0m
^[[0;36mTREE;08;^[[0m
^[[0;36mMy tree ^[[0m I have tree house on it^[[0;31m:-)^[[0m
^[[0;36mTREE;09;^[[0m
-------- just to mark end of file ----------
2）我想去掉所有的“空标签”-所有的标签下都没有评论。
所以我想达到的结果是：
-------- just to mark start of results ----------
^[[1;31mbla bla bla^[[0m
^[[0;36mTREE;01;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mapple tree:^[[0m^[[0m
^[[1;31m4 apples^M^M^[[0m
^[[1;31m6 leafs^M^[[0m
^[[0;36mTREE;03;^[[0m
withered
^[[0;36mTREE;07;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mcherry tree:^[[0m^[[0m
^[[1;31mbig branches^M^M^[[0m
^[[1;31mtchick roots^M^[[0m
^[[0;36mTREE;08;^[[0m
^[[0;36mMy tree ^[[0m I have tree house on it^[[0;31m:-)^[[0m
-------- just to mark end of results ----------
3）我知道：
pcregrep -M 'TREE.*\n(\n|\s)+(?=.*TREE|\z)' my_file
它能像我所期望的那样工作-它只留下没有注释的标签
-------- just to mark start of results ----------
^[[0;36mTREE;02;^[[0m
^[[0;36mTREE;04;^[[0m
^[[0;36mTREE;05;^[[0m
^[[0;36mTREE;06;^[[0m
^[[0;36mTREE;09;^[[0m
-------- just to mark end of results ----------
4）但是命令：
pcregrep -Mv 'TREE.*\n(\n|\s)+(?=.*TREE|\z)' my_file
产品“有线结果”我不明白。
*)如何得到我想要的结果？
使用任何工具，如：pcregrep，ag，ack，sed，awk。。。
最佳答案
我想出的最简单，也可能是最愚蠢的解决方案：
[steelrat@archlinux ~]$ awk '/TREE/ {f=$0;p=1} !/^ *$/&&!/TREE/ {if (p==1) {print f; p=0} print $0}' my_file
-------- just to mark start of results ----------
^[[1;31mbla bla bla^[[0m
^[[0;36mTREE;01;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mapple tree:^[[0m^[[0m
^[[1;31m4 apples^M^M^[[0m
^[[1;31m6 leafs^M^[[0m
^[[0;36mTREE;03;^[[0m
withered
^[[0;36mTREE;07;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mcherry tree:^[[0m^[[0m
^[[1;31mbig branches^M^M^[[0m
^[[1;31mtchick roots^M^[[0m
^[[0;36mTREE;08;^[[0m
^[[0;36mMy tree ^[[0m I have tree house on it^[[0;31m:-)^[[0m
-------- just to mark end of results ----------
如果需要空格（需要额外的工作才能从空节中删除空格）：
$ awk '/^ *$/ {print $0} /TREE/ {f=$0;p=1} !/^ *$/&&!/TREE/ {if (p==1) {print f; p=0} print $0}' my_file
-------- just to mark start of results ----------
^[[1;31mbla bla bla^[[0m
^[[0;36mTREE;01;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mapple tree:^[[0m^[[0m
^[[1;31m4 apples^M^M^[[0m
^[[1;31m6 leafs^M^[[0m
^[[0;36mTREE;03;^[[0m
withered
^[[0;36mTREE;07;^[[0m
^[[1;31m^[[0m
^[[1;31m^[[1;31mcherry tree:^[[0m^[[0m
^[[1;31mbig branches^M^M^[[0m
^[[1;31mtchick roots^M^[[0m
^[[0;36mTREE;08;^[[0m
^[[0;36mMy tree ^[[0m I have tree house on it^[[0;31m:-)^[[0m
-------- just to mark end of results ----------
关于linux - 摆脱文件中多余的线条，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/39765930/