/usr/share/pythia8-examples/examples/main86.cmnd is in pythia8-examples 8.1.80-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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! This file contains commands to be read in for a Pythia8 run.
! Lines not beginning with a letter or digit are comments.
// Number of events generated
Main:numberOfEvents = 1000
// Specify shower options
HadronLevel:all = on
PartonLevel:MPI = on
// Core process for merging
Merging:Process = pp>LEPTONS,NEUTRINOS
// Maximal number of additional LO jets.
Merging:nJetMax = 2
// Merging scale value.
Merging:TMS = 15
// Switch off enforced rapidity ordering
SpaceShower:rapidityOrder = off
// Since UMEPS is a tree-level merging method, both leading-order and
// next-to-neading order PDFs are allowed. However, from parton shower
// considerations, leading-order PDFs are preferred, since multiparton
// interactions probe the incoming hadron at small momentum scales.
// Example PDF files generated with CTEQ6M PDFs.
PDF:useLHAPDF = on
PDF:LHAPDFset = cteq6m.LHpdf
SpaceShower:alphaSvalue = 0.118
TimeShower:alphaSvalue = 0.118
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