文本处理 - 连续出现一行空行则删除这行空行，连续出现两行空行时则只删除一行空行留一行空行
Posted 王万林 Ben
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处理需求
最近在编辑Markdown文本，从普通文本拷贝到code block时，总会多一行空行，链接在这。如何能删除多出来的空行？
规则
- 连续出现一行空行则删除这行空行
- 连续出现两行空行时则只删除一行空行留一行空行。
文本/tmp/test.txt
╭─ben at MacBook Pro in ~ 2021/08/16 - 21:18:29
╰─○ cat /tmp/test.txt
group cpunode0 {
cpuset {
cpuset.cpus = 0-5;
cpuset.mems = 0;
}
memory {
memory.limit_in_bytes = 32766M;
memory.memsw.limit_in_bytes = 32766M;
}
}
group cpunode1 {
cpuset {
cpuset.cpus = 6-11;
cpuset.mems = 1;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
group cpunode2 {
cpuset {
cpuset.cpus = 18-23;
cpuset.mems = 2;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
group cpunode3 {
cpuset {
cpuset.cpus = 12-17;
cpuset.mems = 3;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
实现
实现一：
╭─ben at MacBook Pro in ~ 2021/08/16 - 21:19:14
╰─○ cat /tmp/test.txt | sed -n '$!N;s/\\(.\\)\\n/\\1/;P;D'
group cpunode0 {
cpuset {
cpuset.cpus = 0-5;
cpuset.mems = 0;
}
memory {
memory.limit_in_bytes = 32766M;
memory.memsw.limit_in_bytes = 32766M;
}
}
group cpunode1 {
cpuset {
cpuset.cpus = 6-11;
cpuset.mems = 1;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
group cpunode2 {
cpuset {
cpuset.cpus = 18-23;
cpuset.mems = 2;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
group cpunode3 {
cpuset {
cpuset.cpus = 12-17;
cpuset.mems = 3;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
实现二：
╭─ben at MacBook Pro in ~ 2021/08/16 - 21:19:43
╰─○ cat /tmp/test.txt | awk '{ print; if (length) getline }'
group cpunode0 {
cpuset {
cpuset.cpus = 0-5;
cpuset.mems = 0;
}
memory {
memory.limit_in_bytes = 32766M;
memory.memsw.limit_in_bytes = 32766M;
}
}
group cpunode1 {
cpuset {
cpuset.cpus = 6-11;
cpuset.mems = 1;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
group cpunode2 {
cpuset {
cpuset.cpus = 18-23;
cpuset.mems = 2;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
group cpunode3 {
cpuset {
cpuset.cpus = 12-17;
cpuset.mems = 3;
}
memory {
memory.limit_in_bytes = 32768M;
memory.memsw.limit_in_bytes = 32768M;
}
}
参考资料
https://www.imooc.com/video/14507
https://unix.stackexchange.com/a/492415/287317
https://unix.stackexchange.com/a/492414/287317
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