Question

有很多类似的问题，但我找不到解决问题的方法。我可能不知道该怎么去谷歌。

我正在尝试创建一对数组，然后通过索引循环遍历。数组的内容由以下命令生成：

SetEnvIF X-Forwarded-For "192.168.135.159" AllowIP
SetEnvIF X-Forwarded-For "192.168.135.135" AllowIP

AuthType Basic
AuthName "admin"
AuthUserFile "/var/www/domain.com/cms/.htpasswd"

<RequireAll>
Require env AllowIP
require valid-user
</RequireAll>

但是制作一个像这样的数组

$ cat small | grep -Po "(?<=Query: ).+$" | grep -v "use"

select count(*) from batting_small
select count(*) from batting_small_parquet
select count(*) from batting_small_parquet_stats
select yearid, count(*) from batting_small_parquet group by yearId
select yearid, count(*) from batting_small_parquet_stats group by yearId
select min(hr), max(hr) from batting_small
select min(hr), max(hr) from batting_small_parquet
select min(hr), max(hr) from batting_small_parquet_stats
...

按字而不是按行分割。我该怎么分开？

Answer 1

使用mapfile bash builtin，并从进程替换中重定向grep命令：

mapfile -t queries < <( grep -Po "(?<=Query: ).+$" small | grep -v "use")

Answer 2

您可以在-z中使用grep选项生成NUL终止的输出，然后在while IFS= read -d ''循环中使用进程替换：

while IFS= read -d '' -r line; do
   echo "<<$line>>"
done < <(ggrep -zPo '(?m)(?!.*use)(?<=Query: ).+$' small)

<<select count(*) from batting_small>>
<<select count(*) from batting_small_parquet>>
<<select count(*) from batting_small_parquet_stats>>
<<select yearid, count(*) from batting_small_parquet group by yearId>>
<<select yearid, count(*) from batting_small_parquet_stats group by yearId>>
<<select min(hr), max(hr) from batting_small>>
<<select min(hr), max(hr) from batting_small_parquet>>
<<select min(hr), max(hr) from batting_small_parquet_stats>>

将echo "<<$line>>"行更改为您的实际代码。

另请注意，使用(?m)在正则表达式中启用MULTILINE模式，使用否定前瞻(?!.*use)以避免其他grep -v。

从命令输出创建数组，该命令是换行符并包含空格

2 个答案: