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GPG-CHECK-PATTERN(1)         GNU Privacy Guard 2.3        GPG-CHECK-PATTERN(1)

NAME
       gpg-check-pattern - Check a passphrase on stdin against the patternfile

SYNOPSIS
       gpg-check-pattern [options] patternfile

DESCRIPTION
       gpg-check-pattern checks a passphrase given on stdin against a
       specified pattern file.

       The pattern file is line based with comment lines beginning on the
       first position with a #.  Empty lines and lines with only white spaces
       are ignored.  The actual pattern lines may either be verbatim string
       pattern and match as they are (trailing spaces are ignored) or extended
       regular expressions indicated by a / or !/ in the first column and
       terminated by another / or end of line.  If a regular expression starts
       with !/ the match result is reversed. By default all comparisons are
       case insensitive.

       Tag lines may be used to further control the operation of this tool.
       The currently defined tags are:

       [icase]
              Switch to case insensitive comparison for all further patterns.
              This is the default.

       [case] Switch to case sensitive comparison for all further patterns.

       [reject]
              Switch to reject mode.  This is the default mode.

       [accept]
              Switch to accept mode.

       In the future more tags may be introduced and thus it is advisable not
       to start a plain pattern string with an open bracket.  The tags must be
       given verbatim on the line with no spaces to the left or any non white
       space characters to the right.

       In reject mode the program exits on the first match with an exit code
       of 1 (failure).  If at the end of the pattern list the reject mode is
       still active the program exits with code 0 (success).

       In accept mode blocks of patterns are used.  A block starts at the next
       pattern after an "accept" tag and ends with the last pattern before the
       next "accept" or "reject" tag or at the end of the pattern list.  If
       all patterns in a block match the program exits with an exit code of 0
       (success).  If any pattern in a block do not match the next pattern
       block is evaluated.  If at the end of the pattern list the accept mode
       is still active the program exits with code 1 (failure).

OPTIONS
       --verbose
              Enable extra informational output.

       --check
              Run only a syntax check on the patternfile.

       --null Input is expected to be null delimited.

SEE ALSO
       gpg-agent(1),

       The full documentation for this tool is maintained as a Texinfo manual.
       If GnuPG and the info program are properly installed at your site, the
       command

         info gnupg

       should give you access to the complete manual including a menu
       structure and an index.

GnuPG 2.3.8                       2023-09-28              GPG-CHECK-PATTERN(1)