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curl

    1: Long: version
    2: Short: V
    3: Help: Show version number and quit
    4: ---
    5: Displays information about curl and the libcurl version it uses.
    6: 
    7: The first line includes the full version of curl, libcurl and other 3rd party
    8: libraries linked with the executable.
    9: 
   10: The second line (starts with "Protocols:") shows all protocols that libcurl
   11: reports to support.
   12: 
   13: The third line (starts with "Features:") shows specific features libcurl
   14: reports to offer. Available features include:
   15: .RS
   16: .IP "IPv6"
   17: You can use IPv6 with this.
   18: .IP "krb4"
   19: Krb4 for FTP is supported.
   20: .IP "SSL"
   21: SSL versions of various protocols are supported, such as HTTPS, FTPS, POP3S
   22: and so on.
   23: .IP "libz"
   24: Automatic decompression of compressed files over HTTP is supported.
   25: .IP "NTLM"
   26: NTLM authentication is supported.
   27: .IP "Debug"
   28: This curl uses a libcurl built with Debug. This enables more error-tracking
   29: and memory debugging etc. For curl-developers only!
   30: .IP "AsynchDNS"
   31: This curl uses asynchronous name resolves. Asynchronous name resolves can be
   32: done using either the c-ares or the threaded resolver backends.
   33: .IP "SPNEGO"
   34: SPNEGO authentication is supported.
   35: .IP "Largefile"
   36: This curl supports transfers of large files, files larger than 2GB.
   37: .IP "IDN"
   38: This curl supports IDN - international domain names.
   39: .IP "GSS-API"
   40: GSS-API is supported.
   41: .IP "SSPI"
   42: SSPI is supported.
   43: .IP "TLS-SRP"
   44: SRP (Secure Remote Password) authentication is supported for TLS.
   45: .IP "HTTP2"
   46: HTTP/2 support has been built-in.
   47: .IP "UnixSockets"
   48: Unix sockets support is provided.
   49: .IP "HTTPS-proxy"
   50: This curl is built to support HTTPS proxy.
   51: .IP "Metalink"
   52: This curl supports Metalink (both version 3 and 4 (RFC 5854)), which
   53: describes mirrors and hashes.  curl will use mirrors for failover if
   54: there are errors (such as the file or server not being available).
   55: .IP "PSL"
   56: PSL is short for Public Suffix List and means that this curl has been built
   57: with knowledge about "public suffixes".
   58: .IP "MultiSSL"
   59: This curl supports multiple TLS backends.
   60: .RE