如何在带双引号的前两行末尾添加属性

Question

我们想要添加以下属性：

-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M

在包含单词- HBASE_MASTER_OPTS的前两行中

更改前的示例

more ams-hbase-env-template.txt


export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOccupancyOnly"
export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=71 -XX:+UseCMSInitiatingOccupancyOnly"
export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=72 -XX:+UseCMSInitiatingOccupancyOnly"
export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=73 -XX:+UseCMSInitiatingOccupancyOnly"

更改后的示例(预期结果)

export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M"
export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=71 -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M"
export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=72 -XX:+UseCMSInitiatingOccupancyOnly"
export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=73 -XX:+UseCMSInitiatingOccupancyOnly"

到目前为止我所做的是

sed -i '/HBASE_MASTER_OPTS/ s/$/-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M/' ams-hbase-env-template.txt

但这是不对的，因为

我们希望在双精度结束之前的属性必须只在前两行，即变量是已经在行中的HBASE_MASTER_OPTS

• in quote

• properties属性，那么它将不会在任何下一个time!

上再次追加

Answer 1

这可能适用于您(GNU sed)：

sed '/HBASE_MASTER_OPTS/{x;s/^/x/;/^x\{1,2\}$/{x;/-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M/b;s/"\s*$/ -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M"/;x};x}' file

在包含HBASE_MASTER_OPTS的行上，在保留空间中递增一个计数器，如果该计数器包含1或2，并且不包含字符串-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M，则将最后一个"替换为-XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M"，否则不对该行执行任何操作。

Answer 2

awk '/HBASE_MASTER_OPTS/&&/ -XX:\+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M/{x++;print;next}/HBASE_MASTER_OPTS/&&x<2{gsub(/"$/," -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M\"");x++}1' ams-hbase-env-template.txt

测试：

 awk '/HBASE_MASTER_OPTS/&&/ -XX:\+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M/{x++;print;next}/HBASE_MASTER_OPTS/&&x<2{gsub(/"$/," -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M\"");x++}1' example.txt



export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=70 -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M"

export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=71 -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M"

export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=72 -XX:+UseCMSInitiatingOccupancyOnly"

export HBASE_MASTER_OPTS=" -XX:CMSInitiatingOccupancyFraction=73 -XX:+UseCMSInitiatingOccupancyOnly"

Answer 3

也许这会给你一些启发：

use strict;
use warnings;

my $i = 0;

while (<>) {
    if ($i < 2 && /HBASE_MASTER_OPTS/ && !/UseGCLogFileRotation/) {
        s/"$/ -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M"/;
        $i++;
    }

    print;
}

用法：

$ perl a.pl foo.txt