Singular

One possibility would be that you do not have the correct version of surfer
(you need a C based one, not a java based one,
for example https://imaginary.org/de/node/65
because the java based surfer ignores all command line arguments)
Another possibility would be that the cygwin shell does not recognize
surfer as a command (can you start surfer from a cygwin terminal
by typing ?)

I get the error from singular:

> surfer (f);
Close window to exit from `surfer`.
0
? calling `surfer` failed
(The shell returned the error code 26880.
? leaving surf.lib::surfer

I have installed cygwin, singular and surf, included surf.lib and updated PATH

> system("getenv","PATH");
/usr/bin:/usr/bin/../libexec/singular/MOD:/usr/libexec/singular/MOD:/cygdrive/c/ProgramData/Oracle/Java/javapath:/cygdrive/c/Program Files (x86)/Intel/iCLS Client:/cygdrive/c/Program Files/Intel/iCLS Client:/cygdrive/c/WINDOWS/system32:/cygdrive/c/WINDOWS:/cygdrive/c/WINDOWS/System32/Wbem:/cygdrive/c/WINDOWS/System32/WindowsPowerShell/v1.0:/cygdrive/c/Program Files (x86)/ATI Technologies/ATI.ACE/Core-Static:/cygdrive/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/DAL:/cygdrive/c/Program Files/Intel/Intel(R) Management Engine Components/DAL:/cygdrive/c/Program Files (x86)/Intel/Intel(R) Management Engine Components/IPT:/cygdrive/c/Program Files/Intel/Intel(R) Management Engine Components/IPT:/cygdrive/c/Program Files/Intel/WiFi/bin:/cygdrive/c/Program Files/Common Files/Intel/WirelessCommon:/cygdrive/c/Programme/java/jdk1.7.0_79/bin:/cygdrive/c/Program Files (x86)/Surfer/bin
>

What is missing?

Thanks for help

Jo Wehler