Check if a program exists and if not to install it - bash

Question

I am writing a Jenkins build with an NSIS file. I need a script to check if the device has a certain program installed on it and if it doesn't, it should install the .exe's from the installer folder. I have all the .exe's in the install folder required for the installer to work.
This should be rather simple but i am baffled in this case and could not find any information about this anywhere.

Answer 1

I suppose you are using a windows environment. You could write a powershell script to check it:
Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName | Select-String 'Microsoft Visual C\+\+'
This will list all installed Visual C++ Redistributables
On my machine it looks like that:
#{DisplayName=Microsoft Visual C++ 2005 Redistributable (x64)}
#{DisplayName=Microsoft Visual C++ 2010 x64 Redistributable - 10.0.40219}
#{DisplayName=Microsoft Visual C++ 2012 x64 Additional Runtime - 11.0.61030}
#{DisplayName=Microsoft Visual C++ 2008 Redistributable - x64 9.0.30729.6161}
#{DisplayName=Microsoft Visual C++ 2005 Redistributable (x64)}
#{DisplayName=Microsoft Visual C++ 2008 Redistributable - x64 9.0.30729.17}
#{DisplayName=Microsoft Visual C++ 2013 x64 Additional Runtime - 12.0.21005}
#{DisplayName=Microsoft Visual C++ 2013 x64 Designtime - 12.0.21005}
#{DisplayName=Microsoft Visual C++ 2015 x64 Debug Runtime - 14.0.23506}
#{DisplayName=Microsoft Visual C++ 2015 x64 Minimum Runtime - 14.0.23506}
#{DisplayName=Microsoft Visual C++ 2013 x64 Minimum Runtime - 12.0.21005}
#{DisplayName=Microsoft Visual C++ 2012 x64 Debug Runtime - 11.0.60610}
#{DisplayName=Microsoft Visual C++ 2005 Redistributable (x64)}
#{DisplayName=Microsoft Visual C++ 2015 x64 Additional Runtime - 14.0.23506}
#{DisplayName=Microsoft Visual C++ 2013 x64 Debug Runtime - 12.0.21005}
#{DisplayName=Microsoft Visual C++ 2012 x64 Minimum Runtime - 11.0.61030}
So if your program you want to check is called ProgramWithName just use:
Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName | Select-String ProgramWithName
If you want to know if the SQL Server is installed use:
Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName | Select-String 'Microsoft SQL Server 2014 Express'
this gives you on my machine:
#{DisplayName=Microsoft SQL Server 2014 Express LocalDB }