  751  pstree
  752  clear
  753  ps
  754  clear
  755  YEAR=2024
  756  echo $YEAR
  757  export YEAR_2=2025
  758  echo $YEAR_2 
  759  bash
  760  echo $YEAR
  761  echo $YEAR_2 
  762  clear
  763  date
  764  man date
  765  date +%Y
  766  export YEAR_3=`date +%Y`
  767  echo $YEAR_3
  768  clear
  769  history 

