Linux AWK：使用字段分隔符连接匹配模式

输入文件：

cat /tmp/filename

app_name="MysqlCluster"
whatever whatever
whatever whatever
whatever whatever
whatever whatever
region="Europe"

root@localhost:~# awk -F\" '/app_name|region/ {printf "%s_", $2}' /tmp/filename
MysqlCluster_Europe_root@localhost:~# 

root@localhost:~# awk -F\" '/app_name|region/ {OFS="_"; printf "%s", $2}' /tmp/filename
MysqlClusterEuroperoot@localhost:~#

root@localhost:~# awk -F\" '/app_name|region/ {printf "%s_", $2} END{print} ' /tmp/filename
MysqlCluster_Europe_

And few other attempts on similar lines but have not been successful.

root@localhost:~# awk <here goes some awk magic> /tmp/filename
MysqlCluster_Europe    <<< NOTE: No Underscore at the end

预期输出：

MysqlCluster_Europe

尝试：

cat /tmp/filename

app_name="MysqlCluster"
whatever whatever
whatever whatever
whatever whatever
whatever whatever
region="Europe"

root@localhost:~# awk -F\" '/app_name|region/ {printf "%s_", $2}' /tmp/filename
MysqlCluster_Europe_root@localhost:~# 

root@localhost:~# awk -F\" '/app_name|region/ {OFS="_"; printf "%s", $2}' /tmp/filename
MysqlClusterEuroperoot@localhost:~#

root@localhost:~# awk -F\" '/app_name|region/ {printf "%s_", $2} END{print} ' /tmp/filename
MysqlCluster_Europe_

And few other attempts on similar lines but have not been successful.

root@localhost:~# awk <here goes some awk magic> /tmp/filename
MysqlCluster_Europe    <<< NOTE: No Underscore at the end

我正在寻找：

cat /tmp/filename

app_name="MysqlCluster"
whatever whatever
whatever whatever
whatever whatever
whatever whatever
region="Europe"

root@localhost:~# awk -F\" '/app_name|region/ {printf "%s_", $2}' /tmp/filename
MysqlCluster_Europe_root@localhost:~# 

root@localhost:~# awk -F\" '/app_name|region/ {OFS="_"; printf "%s", $2}' /tmp/filename
MysqlClusterEuroperoot@localhost:~#

root@localhost:~# awk -F\" '/app_name|region/ {printf "%s_", $2} END{print} ' /tmp/filename
MysqlCluster_Europe_

And few other attempts on similar lines but have not been successful.

root@localhost:~# awk <here goes some awk magic> /tmp/filename
MysqlCluster_Europe    <<< NOTE: No Underscore at the end

root@localhost：~#awk/tmp/filename
MysqlCluster_Europe以下内容适用于您的示例。（但它不会打印换行。）

在imo中，一点也不减少您的努力，但在两个单独的操作中处理
app_name
和
region
会更实用，这样它也将支持多个app_name-region对

awk -F\" '/^app_name/ { printf "%s_", $2 } /^region/ { print $2 }' /tmp/filename

下面是一个正则表达式，用于匹配第1列中的app_名称和区域，然后用“=”字符分割

awk '$1 ~ "app_name|region" {split($0,a,"="); printf a[2]}' /tmp/filename | sed 's/"//g'

sed删除双引号

BR
使用GNU awk。即使您的文件中有更多的app_name-region对，这也应该有效：