Provided by: ca-certificates_20230311ubuntu0.22.04.1_all bug


       update-ca-certificates - update /etc/ssl/certs and ca-certificates.crt


       update-ca-certificates [options]


       This manual page documents briefly the update-ca-certificates command.

       update-ca-certificates  is a program that updates the directory /etc/ssl/certs to hold SSL
       certificates  and  generates  ca-certificates.crt,  a  concatenated  single-file  list  of

       It  reads  the  file  /etc/ca-certificates.conf.  Each  line  gives  a  pathname  of  a CA
       certificate under /usr/share/ca-certificates that should be  trusted.   Lines  that  begin
       with  "#"  are  comment lines and thus ignored.  Lines that begin with "!" are deselected,
       causing the deactivation of the CA certificate in question. Certificates must have a  .crt
       extension in order to be included by update-ca-certificates.

       Furthermore  all  certificates  with  a  .crt  extension  found below /usr/local/share/ca-
       certificates are also included as implicitly trusted.

       Before    terminating,    update-ca-certificates    invokes    run-parts    on    /etc/ca-
       certificates/update.d  and  calls  each  hook with a list of certificates: those added are
       prefixed with a +, those removed are prefixed with a -.


       A summary of options is included below.

       -h, --help
              Show summary of options.

       -v, --verbose
              Be verbose. Output openssl rehash.

       -f, --fresh
              Fresh updates.  Remove symlinks in /etc/ssl/certs directory.


              A configuration file.

              A single-file version of CA certificates.  This holds all CA certificates that  you
              activated in /etc/ca-certificates.conf.

              Directory of CA certificates.

              Directory of local CA certificates (with .crt extension).




       This manual page was written by Fumitoshi UKAI <>, for the Debian project
       (but may be used by others).

                                          20 April 2003                 UPDATE-CA-CERTIFICATES(8)