Reference/IfSilent
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IfSilent
jump_if_silent [jump_if_not]
Checks the silent flag, and jumps to jump_if_silent if the installer is silent, otherwise jumps to jump_if_not. The silent flag can be set by SilentInstall, SilentUnInstall, SetSilent and by the user passing /S on the command line.
IfSilent +2 ExecWait '"$INSTDIR\nonsilentprogram.exe"'
Command introduced with NSIS v2.0
