2番目の部分だけを実行するようにこのスクリプトを編集するにはどうすればよいですか？

私はLinuxに初めてアクセスし、2部だけを実行するように（1部を除く）次のスクリプトを調整しようとしています。

fail () { 
 echo Execution aborted. 
 read -n1 -r -p "Press any key to continue..." key 
 exit 1 
}

# "name" and "dirout" are named according to the testcase

export name=case
export dirout=${name}_out
export diroutdata=${dirout}/data

# "executables" are renamed and called from their directory

export dirbin=$HOME/DualSPHysics/bin/linux
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:${dirbin}
export gencase="${dirbin}/GenCase_linux64"
export dualsphysicscpu="${dirbin}/DualSPHysics5.0CPU_linux64"
export dualsphysicsgpu="${dirbin}/DualSPHysics5.0_linux64"
export boundaryvtk="${dirbin}/BoundaryVTK_linux64"
export partvtk="${dirbin}/PartVTK_linux64"
export partvtkout="${dirbin}/PartVTKOut_linux64"
export measuretool="${dirbin}/MeasureTool_linux64"
export computeforces="${dirbin}/ComputeForces_linux64"
export isosurface="${dirbin}/IsoSurface_linux64"
export flowtool="${dirbin}/FlowTool_linux64"
export floatinginfo="${dirbin}/FloatingInfo_linux64"

option=-1
 if [ -e $dirout ]; then
 while [ "$option" != 1 -a "$option" != 2 -a "$option" != 3 ] 
 do 

    echo -e "The folder "${dirout}" already exists. Choose an option.
  [1]- Delete it and continue.
  [2]- Execute post-processing.
  [3]- Abort and exit.
"
 read -n 1 option 
 done 
  else 
   option=1 
fi 


# PART 1
if [ $option -eq 1 ]; then
# "dirout" to store results is removed if it already exists
if [ -e ${dirout} ]; then rm -r ${dirout}; fi

# CODES are executed according the selected parameters of execution in this testcase

${gencase} ${name}_Def ${dirout}/${name} -save:all
if [ $? -ne 0 ] ; then fail; fi

${dualsphysicsgpu} -gpu ${dirout}/${name} ${dirout} -dirdataout data -svres
if [ $? -ne 0 ] ; then fail; fi

fi


# PART 2 
if [ $option -eq 2 -o $option -eq 1 ]; then
export dirout2=${dirout}/particles
${partvtk} -dirin ${diroutdata} -savevtk ${dirout2}/PartFluid -onlytype:-all,fluid -vars:+idp,+vel,+rhop,+press,+vor
if [ $? -ne 0 ] ; then fail; fi

${partvtk} -dirin ${diroutdata} -savevtk ${dirout2}/PartSquare -onlytype:-all,moving
if [ $? -ne 0 ] ; then fail; fi

${partvtkout} -dirin ${diroutdata} -savevtk ${dirout2}/PartFluidOut -SaveResume ${dirout2}/_ResumeFluidOut
if [ $? -ne 0 ] ; then fail; fi


export dirout2=${dirout}/MeasureElevation
${measuretool} -dirin ${diroutdata} -filexml ${dirout}/case.xml -savecsv ${dirout2}/MeasureSWL -points /scratch/gpfs/hse/DualSPHysics/IASS/points.txt -vars:-all -height
if [ $? -ne 0 ] ; then fail; fi


fi
if [ $option != 3 ];then
 echo All done
 else
 echo Execution aborted
fi

read -n1 -r -p "Press any key to continue..." key

パート2を選択せず​​に自動的に実行できますか？

slurmを介してスクリプトを実行しましたが、実行方法が表示されないか、オプションが選択できないため、パート2が自動的に実行されるようにしたいと思います。