If you’ve ever had to handle certificates, it can sometimes – especially when renewing them – become confusing to know which certificate is which. Enter
certdiff, a handy diff tool for certificates, by Mattias Geniar:
$ ./certdiff cronweekly.com/cert.pem sysca.st/cert.pem subject= /CN=cronweekly.com | subject= /CN=sysca.st issuer= /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority issuer= /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority notBefore=Feb 15 08:48:00 2016 GMT | notBefore=Feb 15 09:11:00 2016 GMT notAfter=May 15 08:48:00 2016 GMT | notAfter=May 15 09:11:00 2016 GMT
Differences are highlighted using the
diff -youtput (side-by-side diff), output with the
|character in between indicates differences between the files.