linux install cfssl

install cfssl

source:    
    https://pkg.cfssl.org/

install:

    $ curl -s -L -o /bin/cfssl https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
    $ curl -s -L -o /bin/cfssljson https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
    $ curl -s -L -o /bin/cfssl-certinfo https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
    $ chmod +x /bin/cfssl*
    
    
$ cfssl -h

Usage:
Available commands:
	bundle
	ocspsign
	selfsign
	certinfo
	version
	gencrl
	scan
	info
	revoke
	sign
	ocspserve
	print-defaults
	serve
	genkey
	gencert
	ocspdump
	ocsprefresh
Top-level flags:
  -allow_verification_with_non_compliant_keys
    	Allow a SignatureVerifier to use keys which are technically non-compliant with RFC6962.
  -loglevel int
    	Log level (0 = DEBUG, 5 = FATAL) (default 1)