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NSIS, aka Nullsoft Software Install Script, is a programming language created in 2001.

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Nullsoft Scriptable Install System (NSIS) is a script-driven installer authoring tool for Microsoft Windows with minimal overhead backed by Nullsoft, the creators of Winamp. NSIS is released under a combination of free software licenses, primarily the zlib license. It has become a widely used alternative to commercial proprietary products like InstallShield, with users including, Dropbox, Ubisoft, FL Studio, BitTorrent, and McAfee.. Read more on Wikipedia...

; Hello World in Nullsoft Software Install Script (NSIS) Caption "Hello World!" OutFile ".\HelloWorld.exe" SilentInstall silent Section "" MessageBox MB_OK "Hello World!" SectionEnd
Example from Linguist:
; --------------------- ; x64.nsh ; --------------------- ; ; A few simple macros to handle installations on x64 machines. ; ; RunningX64 checks if the installer is running on x64. ; ; ${If} ${RunningX64} ; MessageBox MB_OK "running on x64" ; ${EndIf} ; ; DisableX64FSRedirection disables file system redirection. ; EnableX64FSRedirection enables file system redirection. ; ; SetOutPath $SYSDIR ; ${DisableX64FSRedirection} ; File some.dll # extracts to C:\Windows\System32 ; ${EnableX64FSRedirection} ; File some.dll # extracts to C:\Windows\SysWOW64 ; !ifndef ___X64__NSH___ !define ___X64__NSH___ !include LogicLib.nsh !macro _RunningX64 _a _b _t _f !insertmacro _LOGICLIB_TEMP System::Call kernel32::GetCurrentProcess()i.s System::Call kernel32::IsWow64Process(is,*i.s) Pop $_LOGICLIB_TEMP !insertmacro _!= $_LOGICLIB_TEMP 0 `${_t}` `${_f}` !macroend !define RunningX64 `"" RunningX64 ""` !macro DisableX64FSRedirection System::Call kernel32::Wow64EnableWow64FsRedirection(i0) !macroend !define DisableX64FSRedirection "!insertmacro DisableX64FSRedirection" !macro EnableX64FSRedirection System::Call kernel32::Wow64EnableWow64FsRedirection(i1) !macroend !define EnableX64FSRedirection "!insertmacro EnableX64FSRedirection" !endif # !___X64__NSH___
Example from Wikipedia:
# Modern UI example script !include MUI.nsh Name "Example 2" OutFile "Example2.exe" !insertmacro MUI_PAGE_WELCOME !insertmacro MUI_PAGE_LICENSE "license.rtf" !insertmacro MUI_PAGE_DIRECTORY !insertmacro MUI_PAGE_COMPONENTS !insertmacro MUI_PAGE_INSTFILES !insertmacro MUI_PAGE_FINISH !insertmacro MUI_LANGUAGE "English" !insertmacro MUI_LANGUAGE "German" !insertmacro MUI_LANGUAGE "French" Section "Extract makensis" SetOutPath $INSTDIR File ..\makensis.exe SectionEnd

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