regex - grep 匹配整个证书？

Question

我正在运行生成这样的证书请求的命令，

some text
some text
certificate is -----BEGIN CERTIFICATE REQUEST-----
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ltjjnB1ecB0sWgpu
-----END CERTIFICATE REQUEST-----

我想将证书自动保存到一个文件中，而不是文本 certificate is 或之前的任何行。

现在我正在使用命令 | grep -A100 "\-----BEGIN" 获取所有行并将其保存到文件但我只是使用 100 作为行数，但证书不是 100 行。如何获得包括 -----BEGIN 在内的确切行数，以便将证书写入文件？

编辑:我也试过这个，command | grep -A$(wc -l) "\-----BEGIN" 但它根本不打印任何内容

谢谢。

Answer 1

使用 GNU awk 进行多字符 RS 和 RT:

$ awk -v RS='-----BEGIN CERTIFICATE REQUEST-----.*-----END CERTIFICATE REQUEST-----' 'RT{print RT}' file
-----BEGIN CERTIFICATE REQUEST-----
MIIEiDCCAnACAQAwGDEWMBQGA1UEAxMNdGVzdHZhdWx0LmNvbTCCAiIwDQYJKoZI
hvcNAQEBBQADggIPADCCAgoCggIBALoGVu7JqQ/60rEZhP2AvRRxf0p9PcQLB8KU
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ltjjnB1ecB0sWgpu
-----END CERTIFICATE REQUEST-----

使用任何 awk:

$ awk -v beg='-----BEGIN CERTIFICATE REQUEST-----' -v end='-----END CERTIFICATE REQUEST-----' 'sub(".*"beg,beg){f=1} f; sub(end".*",end){exit}' file
-----BEGIN CERTIFICATE REQUEST-----
MIIEiDCCAnACAQAwGDEWMBQGA1UEAxMNdGVzdHZhdWx0LmNvbTCCAiIwDQYJKoZI
hvcNAQEBBQADggIPADCCAgoCggIBALoGVu7JqQ/60rEZhP2AvRRxf0p9PcQLB8KU
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ltjjnB1ecB0sWgpu
-----END CERTIFICATE REQUEST-----