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從兩行之間的文件中提取一個塊

[英]Extract a block from file between two lines

我有一個包含以下內容的文件/輸出:

igw_id = igw-96788cf1
private_route_tables_ids = [
    rtb-c2adcda4,
    rtb-c5a3c3a3,
    rtb-c4adcda2
]
private_subnets_cidrs_ipv4 = [
    10.20.10.0/24,
    10.20.11.0/24,
    10.20.12.0/24
]
private_subnets_ids = [
    subnet-6057333b,
    subnet-6be7bf0c,
    subnet-f13419b8
]
public_route_tables_ids = [
    rtb-74a9c912,
    rtb-c5adcda3,
    rtb-2aabcb4c
]
public_subnets_cidrs_ipv4 = [
    10.20.0.0/24,
    10.20.1.0/24,
    10.20.2.0/24
]
public_subnets_ids = [
    subnet-6157333a,
    subnet-17e7bf70,
    subnet-303f1279
]

我想提取所有公共子網ID並在沒有空格的情況下打印它們。

我用了這個正則表達式

sed -n '/public_subnets_ids/{:a;N;/\]/!ba;s/[[:space:]]//g;s/,/\n/g;s/.*public_subnets_ids\|\].*//g;p}' my_file.txt

輸出為:

=[subnet-6157333a
subnet-17e7bf70
subnet-303f1279

但是我想得到這個:

subnet-6157333a
subnet-17e7bf70
subnet-303f1279

實際上,我告訴sed不使用空格(s/[[:space:]]//g)替換空格和換行符,然后它也替換了第一行,然后啟動了第一個子網,因此我將處理正則表達式在第一個換行符之后,當我嘗試這個

sed -n '/public_subnets_ids = \[[\n\r\s]+\\n/{:a;N;/\]/!ba;s/[[:space:]]//g;s/,/\n/g;s/.*public_subnets_ids\|\].*//g;p}' my_file.txt

它不輸出,表示不匹配任何內容。

請幫助改善上述正則表達式,以便僅在分隔行中提供子網ID?

awk解救!

$ awk '/^]/{f=0} f{$1=$1; sub(",",""); print} 
       /public_subnets_ids/{f=1}' file

subnet-6157333a
subnet-17e7bf70
subnet-303f1279

跟隨awk也可能會幫助您。

awk '/public_subnets_ids/{getline;while($0 !~ /]/){gsub(/^[[:space:]]+|,/,"");print;getline}}'   Input_file

編輯:添加非一線形式的解決方案,並在相同的解釋。

awk '
/public_subnets_ids/{         ##Searching for string public_subnets_ids in a line, if yes then do following.
 getline;                     ##Going to next line by using getline utility of awk.
 while($0 !~ /]/){            ##Using while loop till a line is NOT having ]
   gsub(/^[[:space:]]+|,/,"");##Globally substituting initial space and comma with NULL in all lines here.
   print;                     ##Printing the lines here.
   getline                    ##using getline cursor will move to next line of Input_file.
}
}'  Input_file                ##Mentioning the Input_file name here.

sed的另一種方法:

sed -n '/public_subnets_ids/,/]/{//!{s/[ ,]*//g;p;}}' file
  • '/public_subnets_ids/,/]/ :從包含public_subnets_ids行到包含]下一行
  • //! :在匹配的行中,但與地址匹配的行除外
  • //!{s/[ ,]*//g;p;} :刪除逗號和空格字符並輸出結果

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