Cygwin is already installed on CTC and lab machines. For instructions on setting up g for Mac OS X, see: How to Install g on the Mac. On windows, the Cygwin is a Unix-like environment. OS X (now macOS) is full on UNIX, so there is no need for any additions to get these unix.

Cygwin is free software to provide Linux and Unix environment, tools and libraries in Windows operating systems. Cygwin is also called an emulator because it translates Linux system calls into Windows type systems calls. Cygwin generally used to run Linux tools like ssh,scp,bash, X11,gcc in Windows environment. Cygwin support following operating systems

• Windows XP
• Windows Vista
• Windows 7
• Windows 8
• Windows 10
• Windos Server 2003
• Windows Server 2008
• Windows Server 2012
• Windows Server 2016

Download Installation Files

We will download installation files from Cygwin site. There is two type of installation files

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32 bit – x86

32 bit installation file can be downloaded from following link.

64 bit – x86_64

64 bit installation file can be downloaded from following link.

We will start installation by clicking the downloaded files. To install we need Administrator privileges.

In this screen we see information about installation like version, architecture.

We have three option to get installation files.

• Install from Internet will get files from repositories and install
• Download Without Installing will only get files and do not install
• Install from Local Directory will get files from local disk and start installation.

Installation Method

We need to choose the installation directory. Default path is good but we can change to the Program Files too. There is also an option to chose which users can use Cygwin.

We will chose where to save the downloaded Cygwin packages.

Download Directory

We will select the connection type. For regular network connections Direct Connection is enough but if we use proxy we should provide related parameters with the other options.

We will choose the site for downloading packages. Prefer physically near sites for faster download.

Choose Download Site

Then the package and repository information will be updated from previously selected site.

Now we are here to select applications, tools, libraries, groups to install.

Select Packages

We can search package name with the Search box or select from the list directly. Packages are grouped according to their functionalities like Admin , Database , GNOME etc. We can select the whole group or single package from the group.

For simplicity we have searched ssh to installation. After search operation the dependencies are resolved and we will click Next

Install SSH

Installation

We install ssh by downloading dependencies packages. Also this is the first installation so the Cygwin will install base packages those are used by a lot of other applications, tools.

We will install ssh from Net group. We search and select package named openssh.

Add New Package or Tool

After ssh installation is completed we can access to the ssh from Cygwin command line. Cygwin shortcut is created on the desktop. Open it by clicking. And type ssh like below.

Default shell is bash. We can check the current shell with the env command which will list environment related variables. We will search for SHELL line and variable like below.

Run Bash With Cygwin

MSWin users will need the Cygwin development environment in order to get a local copy of NEURON's Subversion repository and / or compile NEURON from source code.

1. Go to http://www.cygwin.com and download setup.exe
   To avoid cluttering up my desktop, I made a special directory on my hard drive called c:installedcygwin and put cygwin.exe in there.
2. Run setup.exe as yourself (not as Administrator).
   • Select 'Install from Internet'.
   • Specify the Root Install Directory to be c:cygwin
   • Install for 'All Users' and set the 'Default Text File Type' to be Unix / binary.
   • Specify your preferred Local Package Directory (I chose c:installedcygwin). This is where the cygwin installer is going to put a folder that has a long, ugly name. You're not going to want to see this folder on your desktop.
   • Choose a download site that is nearby. ftp sites will probably do faster downloads than http. I chose ftp://ftp.gtlib.gatech.edu
   • Select Packages. Accept the defaults except for the following:
     • Archive--get zip and unzip
     • Devel--change to Install
     • Editors--get what you're familiar with. I chose vim.
     • Net--accept the Default selections, but check to make sure openssl is selected.
       openssh doesn't seem to be necessary.
     • Shells--get rxvt: VT102 terminal emulator for both X and Windows

     In each of these cases, be sure to get the 'Bin' (binary), not the 'Src' (source).

   • Cygwin Setup may select additional packages to 'meet dependencies'; accept the selections.
   • At the last step in installation, the installer asks if you want to
     'Create icon on Desktop' or 'Add icon to Start Menu'.
     You will not be using these icons, so uncheck the boxes, then click the Finish button.

Configuring Cygwin

Set up an rxvt shortcut

This will be very handy for quickly creating several shell terminals.

1. Open Windows Explorer, go to c:cygwinbin, and create a shortcut to rxvt.exe
   Move this shortcut to your desktop.
2. Right click on the shortcut icon, select Properties, and change its 'Target' string to
   c:cygwinbinrxvt.exe -fg black -bg white -sl 1000 -e bash
   (that 'sl' is lower case 'SL', not an s followed by the number 1).
   This will give you an rxvt terminal with black text on white background, which runs under the bash shell, and has 1000 lines of scrollable output.
3. Click on 'Apply', then 'OK' to close the properties window.

Set up your home directory and bash shell environment

1. Double click on the rxvt.exe shortcut to open a bash shell window.
   In this window, type

   That should produce the following output:

2. Type the following commands:
   

   where 'yourname' will be the name of your 'home' directory under Cygwin.
   There must be no spaces in whatever you choose for 'yourname'.

3. Next,
   

   and use a text editor to create a file called .bashrc that has these contents:

   Save the file and close the rxvt window.

4. Test this by opening Cygwin's rxvt window (rxvt.exe shortcut on desktop!) and executing this command:
   

   It should return

   Close the rxvt window.