Cygwin

Get that Linux feeling - on Windows

Installing and Updating Cygwin Packages

Installing and Updating Cygwin for 64-bit versions of Windows

Run setup-x86_64.exe any time you want to update or install a Cygwin package for 64-bit windows. The signature for setup-x86_64.exe can be used to verify the validity of this binary using this public key.

Installing and Updating Cygwin for 32-bit versions of Windows

Run setup-x86.exe any time you want to update or install a Cygwin package for 32-bit windows. The signature for setup-x86.exe can be used to verify the validity of this binary using this public key.

General installation notes

When installing packages for the first time, setup*.exe does not install every package. Only the minimal base packages from the Cygwin distribution are installed by default, which takes up about 100 MB.

Clicking on categories and packages in the setup*.exe package installation screen allows you to select what is installed or updated.

Individual packages like bash, gcc, less, etc. are released independently of the Cygwin DLL, so the Cygwin DLL version is not useful as a general Cygwin release number. The setup*.exe utility tracks the versions of all installed components and provides the mechanism for installing or updating everything available from this site for Cygwin.

Once you've installed your desired subset of the Cygwin distribution, setup*.exe will remember what you selected so rerunning the program will update your system with any new package releases.

On Windows Vista and later, setup*.exe will check by default if it runs with administrative privileges and, if not, will try to elevate the process. If you want to avoid this behaviour and install under an unprivileged account just for your own usage, run setup*.exe with the --no-admin option.

Q: How do I add a package to my existing Cygwin installation?

A: Run the setup program and select the package you want to add.

Tip: if you don't want to also upgrade existing packages, select 'Keep' at the top-right of the package chooser page.

Q: Is there a command-line installer?

A: Yes and no. The setup*.exe program understands command-line arguments which allow you to control its behavior and choose individual packages to install. While this provides some functionality similar to such tools as apt-get or yum it is not as full-featured as those package managers.

Q: Why not use apt, yum, my favourite package manager, etc.?

A: The basic reason for not using a more full-featured package manager is that such a program would need full access to all of Cygwin's POSIX functionality. That is, however, difficult to provide in a Cygwin-free environment, such as exists on first installation. Additionally, Windows does not easily allow overwriting of in-use executables so installing a new version of the Cygwin DLL while a package manager is using the DLL is problematic.

Q: How do I install everything?

A: You do not want to do this! This will install an enormous number of packages that you will never use, including debuginfo and source for every package.

If you really must do this, clicking on the "Default" label next to the "All" category to change it to "Install" will mark every Cygwin package for installation. Be advised that this will download and install tens of gigabytes of files to your computer.

Q: How do I verify the signature of setup?

A: e.g.

$ gpg --recv-key 676041BA
gpg: requesting key 676041BA from hkp server keys.gnupg.net
gpg: key 676041BA: public key "Cygwin " imported
gpg: 3 marginal(s) needed, 1 complete(s) needed, PGP trust model
gpg: depth: 0  valid:   3  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 3u
gpg: Total number processed: 1
gpg:               imported: 1

$ gpg --verify setup-x86_64.exe.sig setup-x86_64.exe
gpg: Signature made 26 Jul 2018 23:18:16 BST using DSA key ID 676041BA
gpg: Good signature from "Cygwin "
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 1169 DF9F 2273 4F74 3AA5  9232 A9A2 62FF 6760 41BA

Q: What's the hash of setup?

A: See here

Q: How do I help improve setup?

A: See the setup project page for more information.