Name Resolution in UNIX

Author:

Dimitry Dukhovny

Troubleshooting DNS

Troubleshooting Installed Certificates

Given a collection of one or more PEM files with CA public certs…

1for f in *.pem; do sudo cp ${f} /etc/ca-certificates/update.d; done
2sudo update-ca-certificates
3awk -v cmd='openssl x509 -noout -subject' '
4    /BEGIN/{close(cmd)};{print | cmd}' < /etc/ssl/certs/ca-certificates.crt