Q: What is the actual SEHLL problem of netizens in enterprise work?

SEHLL problems in the work of netizens:
Problem description:
You need to extract the certificate encoding information output by the following command:
# Openssls_client-showcerts-connect192.168.0.111: 443 | sed-ne '/-BEGINCERTIFICATE-/,/-ENDCERTIFICATE-/P' The following is the certificate output information, expected: save the encoding of the first ----- BEGINCERTIFICATE ----- to ----- ENDCERTIFICATE ----- region as a file, and the second EGINCERTIFICATE ----- to ----- ENDCERTIFICATE to save another file, at the same time, you cannot use the row fetch method ....) the command displays oldboy. log.
I have at least four days of classes every week recently, and the time is very tight. Here the old boy teacher only gives me a simple implementation. In fact, there are a lot of methods. I'm sorry for your friends.
For more SHELL programming techniques, you can learn the SHELL advanced programming courses recorded by old boys.

Http://edu.51cto.com/partner/view/id-13.html

Simple answer:

[root@oldboytraining~]# cat oldboy.log----BEGINCERTIFICATE-----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-----ENDCERTIFICATE----------BEGINCERTIFICATE-----2MIID2zCCAsOgAwIBAgIJALlfFe00vbXbMA0GCSqGSIb3DQEBCwUAMIGDMQswCQYDVQQGEwJDTjEQMA4GA1UECAwHQmVpSmluZzEQMA4GA1UEBwwHQmVpSmluZzERMA8GA1UECgwIQ1NEQSBJQk0xGTAXBgNVBAMMEHZtMTk4LmNuLmlibS5jb20xIjAgBgkqhkiG9w0BCQEWE2p1bmx1b2JqQGNuLmlibS5jb20wHhcNMTMwODI3MDAzNDIxWhcNMTQwODI3MDAzNDIxWjCBgzELMAkGA1UEBhMCQ04xEDAOBgNVBAgMB0JlaUppbmcxEDAOBgNVBAcMB0JlaUppbmcxETAPBgNVBAoMCENTREEgSUJNMRkwFwYDVQQDDBB2bTE5OC5jbi5pYm0uY29tMSIwIAYJKoZIhvcNAQkBFhNqdW5sdW9iakBjbi5pYm0uY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5j4hS8wJvvzdmmRNOb8VPrrwNecZU4QFbDWfkzzCDxRHoHIb8Y8OYw9EYB1wbe+CmOCwaBtIJHqhmyJ86zLYAt5hCn1rM4SxjZvEtpLoc2EL2bZor6eq2ta5kSnAOwhnioTivu7vwqpwOTDolGIsmh2qq37rm4k9+fnW8TOY/XRF5JfAIiMlhlgQqvL8//X3c4TzBse4HHtM4JCfC2Wa2mvG9IOPFT0ugMi5bFmYn6GyfY7XO9ZnG2HSat/l2jgveUiS8zOBgf6cqb1BEY2frkBsEfIcqkvpttPLNp/kJbJi8xEylmqxN2p0PuAG5oFA2ANZIPocyYM8dF8uJH1qkQIDAQABo1AwTjAdBgNVHQ4EFgQUGPqupC28Usi0Befhrx6c6OMA6R4wHwYDVR0jBBgwFoAUGPqupC28Usi0Befhrx6c6OMA6R4wDAYDVR0TBAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAz2yj+8ABofDAj/aYOre7fPmrB/oKjxLFc/d5V/gftbNaho1noru62d1zVcjlWNwliNEBATpA6mZFz8swxJ4AYHx1lxbAt1p98vHWmKVG8l+emMeSZ/VVmNU5HCgD+Yb1L//WO4Hjo74y3t/Q8VBa+tydvEA3VuK/CQlU4fFzKp2pQkrqYTKYejr8vBZ8hSmx0w2AsztfS8R0cIPmOP4nzyiccPxyGenGWtmJbVoW+YJR8DQfE95o4LyYYsFhpDjXPMthxyEmt5eDsVOIF4vG8qXq7r3VUpgZvt6k6GgFNuNzfAXsIQU6b1q0NNssLfLSMOIBdNmIPT4B03m4FS4PTA==-----ENDCERTIFICATE-----[root@oldboytraining~]# END="-----END CERTIFICATE-----"[root@oldboytraining~]# echo ${#END}25[root@oldboytraining~]# BEGIN="-----BEGIN CERTIFICATE-----"[root@oldboytraining~]# echo ${#BEGIN}27[root@oldboytraining~]# cat oldboy.shi=1whileread linedoif[ ${#line} -eq 27 ];then   echo "$line">>$i.logelif [ ${#line} -eq 25 ];then       echo "$line">>$i.log((i++))elseecho "$line">>$i.logfidone<oldboy.log[root@oldboytraining~]# sh oldboy.sh[root@oldboytraining~]# cat 1.log----BEGINCERTIFICATE-----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-----ENDCERTIFICATE-----[root@oldboytraining~]# cat 2.log-----BEGINCERTIFICATE-----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-----ENDCERTIFICATE-----

This article from the "old boy linux O & M" blog, please be sure to keep this source http://oldboy.blog.51cto.com/2561410/1300721