cygcheckコマンドは、システムを調査したり、msys上のプログラムに関する情報を出力するための診断ユーティリティ。

$ cygcheck [オプション...] [プログラム名 ...]

$ cygcheck --version
cygcheck (msys) 2.7.0
System Checker for Msys
Copyright (C) 1998 - 2017 Cygwin Authors
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ cygcheck --help
Usage: cygcheck [-v] [-h] PROGRAM
       cygcheck -c [-d] [PACKAGE]
       cygcheck -s [-r] [-v] [-h]
       cygcheck -k
       cygcheck -f FILE [FILE]...
       cygcheck -l [PACKAGE]...
       cygcheck -p REGEXP
       cygcheck --delete-orphaned-installation-keys
       cygcheck -h

List system information, check installed packages, or query package database.

At least one command option or a PROGRAM is required, as shown above.

  PROGRAM              list library (DLL) dependencies of PROGRAM
  -c, --check-setup    show installed version of PACKAGE and verify integrity
                       (or for all installed packages if none specified)
  -d, --dump-only      just list packages, do not verify (with -c)
  -s, --sysinfo        produce diagnostic system information (implies -c)
  -r, --registry       also scan registry for Cygwin settings (with -s)
  -k, --keycheck       perform a keyboard check session (must be run from a
                       plain console only, not from a pty/rxvt/xterm)
  -f, --find-package   find the package to which FILE belongs
  -l, --list-package   list contents of PACKAGE (or all packages if none given)
  -p, --package-query  search for REGEXP in the entire cygwin.com package
                       repository (requires internet connectivity)
  --delete-orphaned-installation-keys
                       Delete installation keys of old, now unused
                       installations from the registry.  Requires the right
                       to change the registry.
  -v, --verbose        produce more verbose output
  -h, --help           annotate output with explanatory comments when given
                       with another command, otherwise print this help
  -V, --version        print the version of cygcheck and exit

Note: -c, -f, and -l only report on packages that are currently installed. To
  search all official Cygwin packages use -p instead.  The -p REGEXP matches
  package names, descriptions, and names of files/paths within all packages.