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README.md

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+# Cert-Tools
+
+Application to show and merge content of PEM files
+
+## Usage
+
+This application provides two tools: `print` and `merge`.
+
+### Print content of PEM files
+
+This will print out some information about the file(s), checks if the certificate chain is valid and each certificate is
+within its lifetime.
+
+If the argument `KEY` is present, the contained private key will be checked against the first certificates
+public key.
+
+If the given certificate file only contains the certificate, but not the complete certificate chain, the optional
+argument `--ca` can be used to print the whole chain.
+
+```
+Usage: cert-tools print [OPTIONS] <CERT> [KEY]
+
+Arguments:
+  <CERT>  Datei mit Zertifikaten im PEM-Format
+  [KEY]   Datei mit Private Key im PEM-Format (Optional)
+
+Options:
+      --ca <CA>  Datei mit CA im PEM-Format (Optional)
+  -h, --help     Print help
+
+```
+
+![](image.jpeg)
+
+### Merge Cert and CA file
+
+This will print out a merged certificate chain.
+
+If the resulting PEM file contains certificates not in required order, the certificates will be sorted.
+In case of certificates present in both files, the application ensures that each certificate only appears once.
+
+If the argument `CA` is missing, only the given certificate file will be processed (sorting, unique certificates).
+
+```
+Usage: cert-tools merge <CERT> [CA]
+
+Arguments:
+  <CERT>  Datei mit Zertifikaten im PEM-Format
+  [CA]    Datei mit CA im PEM-Format
+
+Options:
+  -h, --help  Print help
+```
+
+**Example**
+
+```shell
+cert-tools merge cert.pem ca.pem > chain.pem
+```